Relevant bibliographies by topics / C electrocatalyst

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'C electrocatalyst'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "C electrocatalyst"

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Gao, Yuan, Ka Wang, Haizeng Song, Han Wu, Shancheng Yan, Xin Xu, and Yi Shi. "Fabrication of C/Co-FeS2/CoS2 with Highly Efficient Hydrogen Evolution Reaction." Catalysts 9, no. 6 (June 21, 2019): 556. http://dx.doi.org/10.3390/catal9060556.

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The mainstream strategy for designing hydrogen electrocatalysts is to adjust their surface electronic structure; however, the conductivity of the electrocatalyst and the synergy with its substrate are still challenges to overcome. In this work, we report a carbon-doped Co-FeS2/CoS2 (C/Co-FeS2/CoS2) electrode, prepared via a hydrothermal process with carbon cloth (CC) as the substrate and carbon doping. The C/Co-FeS2/CoS2 electrode shows excellent catalytic activity in the hydrogen evolution reaction (HER) with an overpotential of 88 mV at a current density of −10 mA∙cm−2 in 0.5 M H2SO4 solution. The Tafel slope is 66 mV∙dec−1. Such superior performance is attributed to the high electrical conductivity of the electrocatalyst and its synergy with the substrate. Our study provides an efficient alternative in the field of electrocatalysis.
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Karuppiah, Chelladurai, Balamurugan Thirumalraj, Srinivasan Alagar, Shakkthivel Piraman, Ying-Jeng Jame Li, and Chun-Chen Yang. "Solid-State Ball-Milling of Co3O4 Nano/Microspheres and Carbon Black Endorsed LaMnO3 Perovskite Catalyst for Bifunctional Oxygen Electrocatalysis." Catalysts 11, no. 1 (January 7, 2021): 76. http://dx.doi.org/10.3390/catal11010076.

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Developing a highly stable and non-precious, low-cost, bifunctional electrocatalyst is essential for energy storage and energy conversion devices due to the increasing demand from the consumers. Therefore, the fabrication of a bifunctional electrocatalyst is an emerging focus for the promotion and dissemination of energy storage/conversion devices. Spinel and perovskite transition metal oxides have been widely explored as efficient bifunctional electrocatalysts to replace the noble metals in fuel cell and metal-air batteries. In this work, we developed a bifunctional catalyst for oxygen reduction and oxygen evolution reaction (ORR/OER) study using the mechanochemical route coupling of cobalt oxide nano/microspheres and carbon black particles incorporated lanthanum manganite perovskite (LaMnO3@C-Co3O4) composite. It was synthesized through a simple and less-time consuming solid-state ball-milling method. The synthesized LaMnO3@C-Co3O4 composite was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, Brunauer-Emmett-Teller (BET) analysis, X-ray diffraction spectroscopy, and micro-Raman spectroscopy techniques. The electrocatalysis results showed excellent electrochemical activity towards ORR/OER kinetics using LaMnO3@C-Co3O4 catalyst, as compared with Pt/C, bare LaMnO3@C, and LaMnO3@C-RuO2 catalysts. The observed results suggested that the newly developed LaMnO3@C-Co3O4 electrocatalyst can be used as a potential candidate for air-cathodes in fuel cell and metal-air batteries.
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Karuppiah, Chelladurai, Balamurugan Thirumalraj, Srinivasan Alagar, Shakkthivel Piraman, Ying-Jeng Jame Li, and Chun-Chen Yang. "Solid-State Ball-Milling of Co3O4 Nano/Microspheres and Carbon Black Endorsed LaMnO3 Perovskite Catalyst for Bifunctional Oxygen Electrocatalysis." Catalysts 11, no. 1 (January 7, 2021): 76. http://dx.doi.org/10.3390/catal11010076.

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Developing a highly stable and non-precious, low-cost, bifunctional electrocatalyst is essential for energy storage and energy conversion devices due to the increasing demand from the consumers. Therefore, the fabrication of a bifunctional electrocatalyst is an emerging focus for the promotion and dissemination of energy storage/conversion devices. Spinel and perovskite transition metal oxides have been widely explored as efficient bifunctional electrocatalysts to replace the noble metals in fuel cell and metal-air batteries. In this work, we developed a bifunctional catalyst for oxygen reduction and oxygen evolution reaction (ORR/OER) study using the mechanochemical route coupling of cobalt oxide nano/microspheres and carbon black particles incorporated lanthanum manganite perovskite (LaMnO3@C-Co3O4) composite. It was synthesized through a simple and less-time consuming solid-state ball-milling method. The synthesized LaMnO3@C-Co3O4 composite was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, Brunauer-Emmett-Teller (BET) analysis, X-ray diffraction spectroscopy, and micro-Raman spectroscopy techniques. The electrocatalysis results showed excellent electrochemical activity towards ORR/OER kinetics using LaMnO3@C-Co3O4 catalyst, as compared with Pt/C, bare LaMnO3@C, and LaMnO3@C-RuO2 catalysts. The observed results suggested that the newly developed LaMnO3@C-Co3O4 electrocatalyst can be used as a potential candidate for air-cathodes in fuel cell and metal-air batteries.
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LU, J. L., CHANGWEI XU, and SAN PING JIANG. "ELECTRO-OXIDATION OF ETHANOL ON NANOCRYSTALLINE Pd/C CATALYST PROMOTED WITH OXIDE IN ALKALINE MEDIA." International Journal of Nanoscience 08, no. 01n02 (February 2009): 203–7. http://dx.doi.org/10.1142/s0219581x09005864.

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Nanocrystalline Pd electrocatalyst promoted with transition metal oxide ( Co 3 O 4, NiO , and CoNiO x) is successfully synthesized on high surface carbon support by using intermittent microwave heating (IMH) method. The physical properties of the catalysts are characterized by XRD, TEM, and EDX. The results show that there is no significant microstructure change between Pd and Pd -oxide electrocatalysts and the particle sizes are in the range 5.8–3.9 nm. The linear sweep voltammogram and chronoamperometry results for the electro-oxidation of ethanol show that Pd -oxide/ C electrocatalysts exhibit much better electrochemical activity and stability as compared with pure Pd / C electrocatalyst. The results show that Pd – CoNiO x/ C exhibits the best stability and highest electro-oxidation activity, indicating the promising potential as an alternative electrocatalysts for the direct ethanol fuel cells.
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He, Yan, Tao Yu, Hui Wen, and Rui Guo. "Boosting the charge transfer of FeOOH/Ni(OH)2 for excellent oxygen evolution reaction via Cr modification." Dalton Transactions 50, no. 28 (2021): 9746–53. http://dx.doi.org/10.1039/d1dt01469b.

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Cr-Doped FeOOH/Ni(OH)2 electrocatalysts were prepared via a facile hydrothermal method at 120 °C. The electrocatalyst exhibited outstanding OER performance, with an overpotential of 291 mV at 50 mA cm−2.
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Zheng, Penglun, Quanyi Liu, Xiaoliang Peng, Laiquan Li, and Jun Yang. "Constructing Ni–Mo2C Nanohybrids Anchoring on Highly Porous Carbon Nanotubes as Efficient Multifunctional Electrocatalysts." Nano 15, no. 10 (October 2020): 2050135. http://dx.doi.org/10.1142/s1793292020501350.

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It is important for regenerative fuel cells, rechargeable metal–air batteries and water splitting to find reasonable designed nonprecious metal catalysts, which have efficient and durable electrocatalytic activities for oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In this work, through a simple hydrothermal method and following annealing process, Mo2C and Ni nanoparticles were encapsulated in a nanoporous hierarchical structure of carbon (Ni/Mo2C/C). The ingenious structure delivers several favorable characteristics including abundant active sites resulting from hollow and mesoporous architecture, boosted reaction kinetics from metallic components, sufficient interfacial effect and synergistic effect from intimate integration of Mo2C, Ni and C. The multifunctional Ni/Mo2C/C hybrid electrocatalyst performs excellently for ORR, OER and HER, better than most of the reported electrocatalysts with three functions. A facile and novel strategy was developed to construct the multifunctional catalysts with excellent electrocatalysis behavior.
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Carbajal, F. Ginez, M. A. García, and S. A. Gamboa. "Study of Ethanol Electrooxidation Reaction at Room Temperature on Nanometric Pt-Ru, Pt-Sn and Pt-Ru-Sn in Direct Alcohol Fuel Cells." Journal of New Materials for Electrochemical Systems 21, no. 1 (April 16, 2018): 043–49. http://dx.doi.org/10.14447/jnmes.v21i1.522.

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Ethanol electrooxidation in acid medium was investigated on Pt-Ru-Sn/C, Pt-Ru/C and Pt-Sn/C. The electrocatalysts were synthesized by microwave assisted chemical reduction reaction. The samples were characterized by transmission electron microscopy (TEM), X-ray diffraction analysis (XRD) and electrochemical analysis for the electrooxidation of ethanol. The ternary electrocatalyst was evaluated in an experimental Direct Ethanol Fuel Cell (DEFC). The method of synthesis used in this work allowed the formation of nanostructured electrocatalysts. The results obtained by electrochemical studies showed that the ternary system Pt-Ru-Sn/C exhibited the highest activity with respect to the binary systems Pt-Ru/C and Pt-Sn/C for carrying out the ethanol electrooxidation reaction. 0.4 mg∙cm-2 of electrocatalytic load of Pt-Ru-Sn/C was placed in the anode of an experimental fuel cell operating at room temperature. It was possible to obtain a power density of 0.14, 0.12 and 0.11 mW∙cm-2 after 20, 40 and 60 minutes respectively. The experiments were carried out at a controlled temperature of 297 K and they showed the feasibility to produce electricity at room temperature by using this ternary electrocatalyst in Direct Ethanol Fuel Cells.
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Kim, Jihun, Dae Hoon Lee, Yang Yang, Kai Chen, Chunli Liu, Jun Kang, and Oi Lun Li. "Hybrid Molybdenum Carbide/Heteroatom-Doped Carbon Electrocatalyst for Advanced Oxygen Evolution Reaction in Hydrogen Production." Catalysts 10, no. 11 (November 8, 2020): 1290. http://dx.doi.org/10.3390/catal10111290.

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Hydrogen energy is one of the key technologies that can help to prevent global warming. A water electrolysis process can be used to produce hydrogen, in which hydrogen is produced at one electrode of the electrochemical cell, and oxygen is produced at the other electrode. On the other hand, the oxygen evolution reaction (OER) requires multiple reaction steps and precious-metal-based catalysts (e.g., Ru/C, Ir/C, RuO2, and IrO2) as electrocatalysts to improve the reaction rate. Their high cost and limited supply, however, limit their applications to the mass production of hydrogen. In this study, boron, nitrogen-doped carbon incorporated with molybdenum carbide (MoC-BN/C) was synthesized to replace the precious-metal-based catalysts in the OER. B, N-doped carbon with nanosized molybdenum nanoparticles was fabricated by plasma engineering. The synthesized catalysts were heat-treated at 600, 700, and 800 °C in nitrogen for one hour to enhance the conductivity. The best MoC-BN/C electrocatalysts (heated at 800 °C) exhibited superior OER catalytic activity: 1.498 V (vs. RHE) and 1.550 V at a current density of 10 and 100 mA/cm2, respectively. The hybrid electrocatalysts even outperformed the noble electrocatalyst (5 wt.% Ru/C) with higher stability. Therefore, the hybrid electrocatalyst can replace expensive precious-metal-based catalysts for the upcoming hydrogen economy.
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Weng, Yu-Ching, Cheng-Jen Ho, Hui-Hsuan Chiao, and Chen-Hao Wang. "Pt3Ni/C and Pt3Co/C cathodes as electrocatalysts for use in oxygen sensors and proton exchange membrane fuel cells." Zeitschrift für Naturforschung B 75, no. 12 (December 16, 2020): 1029–35. http://dx.doi.org/10.1515/znb-2020-0116.

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AbstractThe composites Pt3Ni/C and Pt3Co/C are electrocatalysts for oxygen reduction reactions (ORRs). This study compares the electrocatalytic activity of these electrodes that are used to detect oxygen, and determines their suitability for use in proton exchange membrane fuel cells (PEMFCs). Chemical reduction is used to produce the Pt3Ni/C and Pt3Co/C electrocatalysts. The particle size, elemental composition and crystallinity of the intermetallic electrocatalysts are determined using transmission electron microscopy (TEM) and an energy-dispersive spectrometer (EDX). The ORR activity of the Pt3Ni/C and Pt3Co/C electrocatalysts is determined using cyclic voltammetry (CV), a polarization curve (PC) and a rotating disk electrode (RDE). The Pt3Ni/C electrode registers a greater current for the ORR as compared to the Pt3Co/C electrode. Both electrodes exhibit a linear relationship between response current and oxygen concentration in the detection range from 100 to 1000 ppm. The Pt3Ni/C electrode exhibits a significant sensitivity to oxygen up to 13.4 μA ppm−1 cm−2. A membrane electrode assembly (MEA) that is produced using Pt3Ni/C as a cathodic electrocatalyst in a single PEMFC generates a maximum power density of 1097 mW cm−2.
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Zhang, Xu, An Chen, Zihe Zhang, and Zhen Zhou. "Double-atom catalysts: transition metal dimer-anchored C2N monolayers as N2 fixation electrocatalysts." Journal of Materials Chemistry A 6, no. 38 (2018): 18599–604. http://dx.doi.org/10.1039/c8ta07683a.

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By first-principles computations, we investigated the electrocatalysis of transition metal atom-anchored C2N monolayers (TMx@C2N, x = 1 or 2) for N2 fixation and proposed that Mo2@C2N is a promising electrocatalyst for the reduction of N2 to NH3.
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Dissertations / Theses on the topic "C electrocatalyst"

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Ying, Qiling. "Preparation and characterization of highly active nano pt/c electrocatalyst for proton exchange membrane fuel cell." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3791_1188474883.

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Catalysts play an essential role in nearly every chemical production process. Platinum supported on high surface area carbon substrates (Pt/C) is one of the promising candidates as an electrocatalyst in low temperature polymer electrolyte fuel cells. Developing the activity of the Pt/C catalyst with narrow Pt particle size distribution and good dispersion has been a main concern in current research.


In this study, the main objective was the development and characterization of inexpensive and effective nanophase Pt/C electrocatalysts. A set of modified Pt/C electrocatalysts with high electrochemical activity and low loading of noble metal was prepared by the impregnation-reduction method in this research. The four home-made catalysts synthesized by different treatments conditions were characterized by several techniques such as EDS, TEM, XRD, AAS, TGA, BET and CV.


Pt electrocatalysts supported on acid treatment Vulcan XC-72 electrocatalysts were produced successfully. The results showed that Pt particle sizes of Pt/C (PrOH)x catalysts between 2.45 and 2.81nm were obtained with homogeneous dispersion, which were more uniform than the commercial Pt/C (JM) catalyst. In the electrochemical activity tests, ORR was confirmed as a structure-sensitive reaction. The Pt/C (PrOH/pH2.5) showed promising results during chemically-active surface area investigation, which compared well with that of the commercial standard Johnson Matthey Pt/C catalyst. The active surface area of Pt/C (PrOH/pH2.5) at 17.98m2/g, was higher than that of the commercial catalyst (17.22 m2/g ) under the conditions applied. In a CV electrochemical activity test of Pt/C catalysts using a Fe2+/Fe3+ mediator system study, Pt/C (PrOH/pH2.5) (67mA/cm2) also showed promise as a catalyst as the current density is comparable to that of the commercial Pt/C (JM) (62mA/cm2).


A remarkable achievement was attained in this study: the electrocatalyst Pt supported on CNTs was synthesized effectively. This method resulted in the smallest Pt particle size 2.15nm. In the electrochemically-active surface area study, the Pt/CNT exhibited a significantly greater active surface area (27.03 m2/g) and higher current density (100 mA/cm2) in the Fe2+/Fe3+ electrochemical mediator system than the other home-made Pt/C catalysts, as well as being significantly higher than the commercial Pt/C (JM) catalysts. Pt/CNT catalyst produced the best electrochemical activities in both H2SO4 and K4[Fe(CN)6] electrolytes. As a result of the characteristics of Pt/CNT，it can be deduced that the Pt/CNT is the best electrocatalyst prepared in this study and has great potential for use in fuel cell applications.

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Jackson, Colleen. "SiC and B₄C as electrocatalyst support materials for low temperature fuel cells." Doctoral thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/27313.

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Supported nano-catalyst technologies are key for increasing the catalyst utilisation and achieving economically feasible platinum metal loadings in hydrogen polymer electrolyte fuel cells (PEFCs). High surface area carbons are commonly utilised as support materials for platinum due to low cost, large surface areas and high conductivity. However, PEFCs using this technology undergo oxidation of carbon supports, significantly reducing the lifetime of the fuel cell. In this work, silicon carbide and boron carbide are investigated as alternative catalyst support materials to carbon, for the oxygen reduction reaction for low temperature fuel cells. Electrochemical testing, accelerated degradation studies as well as advanced characterisation techniques were used to clarify the structure-property relationships between catalyst morphology, metal-support interaction, ORR activity and surface adsorption onto the Pt nanoparticles. Extended X-ray Absorption Fine Structure (EXAFS) analysis gave insights into the shape of the clustered nanoparticles while X-ray Photoelectron Spectroscopy (XPS) and in-situ X-ray Absorption Near-Edge Spectroscopy (XANES) analysis provided information into how the metal-support interaction influences surface adsorption of intermediate species. Electronic metal-support interactions between platinum and the carbide supports were observed which influenced the electrochemical characteristics of the catalyst, in some cases increasing the oxygen reduction reaction activity, hydrogen oxidation reaction activity and Pt stability on the surface of the support.
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Crisafulli, Rudy. "Preparação de eletrocatalisadores PtSnCu/C e PtSn/C e ativação por processos de Dealloying para aplicação na oxidação eletroquímica do Etanol." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-03042013-091008/.

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Foram preparados eletrocatalisadores PtSnCu/C (com diferentes razões atômicas Pt:Sn:Cu) e PtSn/C (50:50) com 20 % em massa de metais pelos métodos da redução por borohidreto (IRB) e redução por álcool (RA). Utilizou-se H2PtCl6.6H2O, SnCl2.2H2O e CuCl2.2H2O como fonte de metais, NaBH4 e etilenoglicol como agentes redutores, 2-propanol e etilenoglicol/água como solventes e carbono como suporte. Numa segunda etapa, estes eletrocatalisadores foram ativados pelos processos de dealloying químico (DQ), por tratamento com HNO3 e dealloying eletroquímico (DE), utilizando a técnica de eletrodo de camada fina porosa. Os materiais obtidos foram caracterizados por energia dispersiva de raios-X (EDX), difração de raios-X (DRX), microscopia eletrônica de transmissão (MET), energia dispersiva de raios-X de varredura linear (EDX-VL) e voltametria cíclica (VC). Estudos eletroquímicos para a oxidação eletroquímica do etanol foram realizados por voltametria cíclica, cronoamperometria e células unitárias (conjunto eletrodos/membrana). Os efluentes anódicos provenientes dos testes em células unitárias foram analisados por cromatografia a gás de alta eficiência (CG). Os difratogramas de raios-X dos eletrocatalisadores sintetizados mostraram a típica estrutura cúbica de face centrada (CFC) de liga de platina e após tratamento por dealloying, observou-se que a estrutura (CFC) foi preservada. O tamanho de cristalito dos eletrocatalisadores como preparados variou na ordem de 2 nm a 3 nm e, após processos de dealloying, não foram observadas variações de tamanho significativas. Análises por EDX dos eletrocatalisadores como preparados mostraram similaridade entra a razão atômica Pt:Sn e Pt:Sn:Cu obtida e a nominal. Após dealloying químico e eletroquímico, observou-se variação nas razões atômicas Pt:Sn e Pt:Sn:Cu, indicando a remoção parcial de Cu e Sn. Contudo, o processo de dealloying químico mostrou-se mais eficiente para a remoção de Cu e o dealloying eletroquímico para a remoção de Sn. As análises por EDX-VL mostraram que os processos de dealloying foram efetivos na remoção dos átomos mais superficiais de Cu e/ou Sn da estrutura CFC da Pt. Os resultados obtidos por cronoamperometria e voltametria cíclica mostraram que os eletrocatalisadores com teores de Pt maiores ou iguais a 30 %, após dealloying químico e eletroquímico apresentaram melhora significativa na atividade eletrocatalítica para a oxidação eletroquímica do etanol no potencial de interesse (0,5 V). Os eletrocatalisadores que apresentaram maior eficiência para oxidação eletroquímica do etanol foram PtSn/C (50:50) IRB/DE > PtSnCu/C (50:40:10) RA/DE > PtSnCu/C (50:10:40) IRB/DQ. Foram testados em células unitárias alimentadas diretamente com etanol os eletrocatalisadores PtSn/C (50:50) IRB/DQ, PtSnCu/C (50:10:40) IRB/DQ, PtSnCu/C (50:40:10) RA/DQ e os eletrocatalisadores comerciais Pt/C BASF e PtSn/C (75:25) BASF. Os eletrocatalisadores apresentaram a seguinte ordem de desempenho: PtSn/C (50:50) IRB/DQ > PtSnCu/C (50:40:10) RA/DQ > PtSn/C (75:25) BASF > PtSnCu/C (50:10:40) IRB/DQ > Pt/C BASF. Análises por cromatografia gasosa dos efluentes anódicos desses eletrocatalisadores mostraram formação de ácido acético e acetaldeído como produtos principais.
PtSnCu/C (with different Pt:Sn:Cu atomic ratios) and PtSn/C (50:50) electrocatalysts were prepared by borohydride (BR) and alcohol-reduction (AR) processes using H2PtCl6.6H2O, SnCl2.2H2O and CuCl2.2H2O as metal sources, NaBH4 and ethylene glycol as reducing agents, 2-propanol and ethylene glycol/water as solvents and carbon black as support. In a further step, these electrocatalysts were activated by chemical (CD) and electrochemical (ED) dealloying processes through acid treatment and thin porous coating technique, respectively. These materials were characterized by energy dispersive X-ray, X-ray diffraction, transmission electron microscopy, line scan energy dispersive X-ray and cyclic voltammetry. Electrochemical studies for ethanol electro-oxidation were performed by cyclic voltammetry, chronoamperometry and in single Direct Ethanol Fuel Cell using Membrane Electrode Assembly (MEA). The anodic efluents were analised by gas chromatrography. The X-ray diffractograms of the as-synthesized electrocatalysts showed the typical face-centered cubic structure (FCC) of platinum and its alloys. After dealloying, the X-ray diffractograms showed that the Pt FCC structure was preserved. The crystallite sizes of the as-synthesized electrocatalysts were in the range of 2 nm to 3 nm and after dealloying there were no significant variations in sizes. The energy dispersive X-ray analysis of the as-synthesized electrocatalysts showed a Pt:Sn and Pt:Sn:Cu atomic ratios similar to the nominal values. After chemical and electrochemical dealloying of the electrocatalysts the ranged Pt:Sn and Pt:Sn:Cu atomic ratios showed that Cu and Sn atoms were removed. However, chemical dealloying process proved to be more efficient for removing Cu and electrochemical dealloying for removing Sn. The line scan energy dispersive X-ray analysis showed that acid and electrochemichel treatments were efficient to dealloying Cu and/or Sn superficial atoms of the FCC structure of Pt. The results obtained by cyclic voltammetry and chronoamperometry showed that electrocatalysts containing 30 at % or more of platinum, after chemical and electrochemical dealloying had significant improvement in electrocatalytic activity for ethanol electro-oxidation in the potential of interest. The electrocatalysts with higher efficiency for electrochemical oxidation of ethanol were PtSn/C (50:50) BR/ED > PtSnCu/C (50:40:10) AR/ED > PtSnCu/C (50:10:40) BR/CD. PtSn/C (50:50) BR/CD, PtSnCu/C (50:10:40) BR/CD, PtSnCu/C (50:40:10) AR/CD electrocatalysts and Pt/C BASF, PtSn/C (75:25) BASF commercial electrocatalysts were tested in single Direct Ethanol Fuel Cell. The results showed the following peformance for ethanol electro-oxidation: PtSn/C (50:50) BR/CD > PtSnCu/C (50:40:10) AR/CD > PtSnCu/C > PtSn/C (75:25) BASF > PtSnCu/C (50:10:40) BR/CD > Pt/C BASF.
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Costa, Rom?rio Cezar Pereira da. "Caracteriza??o dos eletrocatalisadores LaMnO3, LaFeO3, LaFe0,2Mn0,8O3 E La0,5Fe0,5MnO3 preparados por autocombust?o assistida por microondas para c?todos de c?lulas a combust?vel do tipo SOFC." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17744.

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Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico
Materials consisting of perovskite-type oxides (ABO3) have been developed in this work for applications in fuel cell cathodes of solid oxide type (SOFC). These ceramic materials are widely studied for this type of application because they have excellent electrical properties, conductivity and electrocatalytic. The oxides LaMnO3, LaFeO3, LaFe0.2Mn0.8O3 e La0.5Fe0.5MnO3 were synthesized by the method of microwave assisted combustion and after sintering at 800?C in order to obtain the desired phases. The powders were characterized by thermogravimetry (TG), X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM) and voltammetric analysis (cyclic voltammetry and polarization curves). The results obtained by XRF technique showed that the microwave synthesis method was effective in obtaining doping oxides with values near stoichiometric. In general, powders were obtained with particle size less than 0.5 μm, having a porous structure and uniform particle size distribution. The particles showed spherical form, irregular and crowded of varying sizes, according to the analysis of SEM. The behavior of the oxides opposite the thermal stability was monitored by thermogravimetric curves (TG), which showed low weight loss values for all samples, especially those of manganese had its structure. By means of Xray diffraction of the samples sintered at 800?C was possible to observe the formation of powders having high levels of crystallinity. Furthermore, undesirable phases such as La2O3 and MnOx were not identified in the diffractograms. These phases block the transport of oxygen ions in the electrode/electrolyte interface, affecting the electrochemical activity of the system. The voltammetric analysis of the electrocatalysts LF-800, LM-800, LF2M8-800 e L5F5M-800 revealed that these materials are excellent electrical conductors, because it increased the passage of electrical current of the working electrode significantly. Best performance for the oxygen reduction reaction was observed with iron-rich structures, considering that the materials obtained have characteristics suitable for use in fuel cell cathodes of solid oxide type
Materiais constitu?dos de ?xidos do tipo perovskita (ABO3) t?m sido desenvolvidos no presente trabalho para aplica??es em c?todos de c?lulas a combust?vel do tipo ?xidos s?lidos (SOFC). Estes materiais cer?micos s?o amplamente estudados para esse tipo de aplica??o porque apresentam ?timas propriedades el?tricas, condutoras e eletrocatal?ticas. Os ?xidos LaMnO3, LaFeO3, LaFe0,2Mn0,8O3 e La0,5Fe0,5MnO3 foram sintetizados pelo m?todo de combust?o assistida por microondas e logo ap?s sinterizados a 800?C a fim de obter as fases desejadas. Os p?s obtidos foram caracterizados por termogravimetria (TG), difratometria de raios-X (DRX), fluoresc?ncia de raios-X (FRX), microscopia eletr?nica de varredura (MEV) e an?lise voltam?trica (voltametria c?clica e curvas de polariza??o). Os resultados obtidos atrav?s da t?cnica de FRX evidenciam que a escolha do m?todo de s?ntese por microondas foi eficaz na obten??o de ?xidos com valores de dopagens pr?ximos ao estequiom?trico. No geral, foram obtidos p?s com tamanho de part?culas inferiores a 0,5 μm, apresentando estrutura porosa e distribui??o de part?culas uniformes. As part?culas se apresentaram na forma esf?rica, irregular e aglomerada de tamanhos variados, segundo a an?lise de MEV. O comportamento dos ?xidos frente ? estabilidade t?rmica foi monitorado atrav?s das curvas termogravim?tricas (TG), a qual mostrou baixos valores de perdas de massa para todas as amostras, principalmente aquelas que apresentavam o mangan?s em sua estrutura. Por meio da difratometria de raios-X das amostras sinterizadas a 800?C foi poss?vel observar a forma??o de p?s com elevados valores de cristalinidade. Al?m disto, fases indesej?veis como La2O3 e MnOx, n?o foram identificadas nos difratogramas. Estas fases bloqueiam o transporte de ?ons oxig?nio na interface eletrodo/eletr?lito, comprometendo a atividade eletroqu?mica do sistema. A an?lise voltam?trica dos eletrocatalisadores LF-800, LM-800, LF2M8-800 e L5F5M-800 demonstrou que estes materiais s?o ?timos condutores, porque aumentaram a passagem de corrente el?trica do eletrodo de trabalho de forma significativa. Melhor desempenho para a rea??o de redu??o de oxig?nio foi observado com estruturas ricas em ferro, considerando que os materiais obtidos possuem caracter?sticas apropriadas para aplica??o em c?todos de c?lulas a combust?vel de ?xidos s?lidos
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CARDOSO, ELISANGELA S. "Síntese e caracterização de eletrocatalisadores Pt/C, PtAu/C e PtAuBi/C pelo método da redução via feixe de elétrons para oxidação direta de metanol e etanol." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10132.

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Dissertação (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Haslam, Gareth Eric. "Ni-C and WC materials as fuel cell electrocatalysts." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610113.

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Bach, Delpeuch Antoine. "Etude du mécanisme de la réaction d'oxydation de l'éthanol sur électrocatalyseurs à base de Pt, Rh, SnO2 sur support carboné en milieu acide." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENI089/document.

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L'étude du mécanisme de la réaction d'oxydation de l'éthanol (EOR) a été réalisée sur des électrocatalyseurs bi- et tri-métalliques à base de Pt, Rh et SnO2 sur support carboné à l'aide de méthodes électrochimiques couplées (DEMS, in situ FTIR). Deux importantes problématiques de l'EOR ont été abordées: la déshydrogénation de la molécule d'éthanol et la cassure de sa liaison C-C.L'investigation de certains paramètres expérimentaux, comme l'épaisseur de la couche d'électrocatalyseur, a permis de démontrer q'une couche active épaisse conduit à une meilleure électrooxydation plus complète de l'éthanol en CO2, mais également que l'empoisonnement de l'électrocatalyseur par de très forts adsorbats advient dans l'épaisseur de couche active.Les performances de chaque électrocatalyseur ont été comparées entre elles et ont mis en évidence une meilleure sélectivité de l'EOR sur Pt-Rh-SnO2/C, ainsi que l'engendrement de courants plus élevés à bas potentiel à température ambiante. La tendance est amplifiée à température plus élevée (T = 60 °C)
The study of the ethanol oxidation reaction (EOR) mechanism was performed on carbon supported bi- and tri-metallic Pt-, Rh-, SnO2-based electrocatalysts via electrochemical coupled techniques (DEMS, in situ FTIR). Two of the most important issues related to the EOR have been broached: the dehydrogenation of the ethanol molecule and its C-C bond breaking.The investigation of some experimental parameters, such as the thickness of the electrocatalyst layer, enabled demonstrating the better complete ethanol electrooxidation into CO2 for large electrocatalysts layers, combined to the enhanced poisoning effect inside the catalyst layer by very strong adsorbates.The performances of each electrocatalyst were compared and evidenced an improved selectivity of the EOR on Pt-Rh-SnO2/C, as well as the generation of higher currents at low potential at room temperature. The tendency was amplified at elevated temperatures (T = 60 °C)
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Gallo, Irã Borges Coutinho [UNESP]. "Preparação e teste de nanocatalisadores 'PTFENI'/'C' e 'PTFECO'/'C' para redução de oxigênio." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/92052.

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Neste trabalho foram sintetizadas nanopartículas de Pt, PtFe, PtNi, PtCo, PtFeNi e PtFeCo suportadas em pó de carbono através do método da microemulsão, que foram testadas como potenciais eletrocatalisadores frente a reação de redução do oxigênio (RRO). As propriedades eletrônicas dos materiais foram investigadas por XAS (Espectroscopia de Absorção de Raios X) e as propriedades estruturais e morfológicas por DRX (Difração de Raios X) e MET (Microscopia Eletrônica de Transmissão), respectivamente. A área superficial de platina eletroquimicamente ativa foi determinada a partir de dados de voltametria cíclica, enquanto a atividade eletrocatalítica para a RRO foi estudada em soluções de H2SO4 saturadas com O2, utilizando a técnica do eletrodo de disco rotatório. Em geral, a análise dos materiais binários e ternários mostrou uma diminuição no parâmetro de rede em relação à platina pura, o que é um indicativo da formação de liga. O método de síntese escolhido permitiu a obtenção de cristalitos com faixa de tamanhos em torno de 3 nm. Somente os materiais contendo nanopartículas trimetálicas apresentaram alto grau de aglomeração e uma distribuição não homogênea sobre o carbono suporte. As análises eletroquímicas sugerem que a RRO segue majoritariamente o mecanismo via 4 elétrons em todos os catalisadores estudados nesse trabalho. O estudo das propriedades eletrônicas indica que a presença de Fe, Ni e Co contribui para o preenchimento da banda 5d da platina. Todas estas informações foram correlacionadas na tentativa de se entender a razão pela qual os catalisadores trimetálicos, principalmente o PtFeCo/C, apresentaram atividade superior para a RRO quando comparados com os bimetálicos e a Pt/C. Os materiais ternários foram submetidos a tratamento térmico a 150 ºC em atmosfera de H2 por uma hora...
In this work, nanoparticles of Pt, PtFe, PtNi, PtCo, PtFeNi and PtFeCo supported on carbon powder were synthesized by a microemulsion method and tested as potential electrocatalysts for the oxygen reduction reaction (ORR). The electronic properties of the materials were investigated by XAS (X-ray Absorption Spectroscopy) and the structural and morphological properties by XRD (X-ray diffraction) and TEM (Transmission Electronic Microscopy), respectively. The platinum electrochemically active surface area was determined from cyclic voltammetry data while the electrocatalytic activity toward the ORR was studied using the rotating disk electrode technique in O2 saturated H2SO4 solutions. Overall, the analyses of the materials showed a decrease in the lattice parameter when compared to pure Pt, which suggests alloy formation. The chosen synthesis method allowed obtaining small crystallites with average size around 3 nm. Only the catalysts containing trimetallic nanoparticles were highly agglomerated and showed an inhomogeneous distribution of particles on the carbon support. The electrochemical analyses suggest that the ORR occurs mainly through the 4 electron mechanism on all catalysts studied in this work. The study of the electronic properties evidenced that the presence of Fe, Ni and Co increases the platinum 5d-band occupancy. All results were correlated aiming a better understanding of why the trimetallic catalysts, particularly PtFeCo/C, have significantly higher ORR activity than bimetallic materials and Pt/C. The trimetallic catalysts were heat treated at 150 ºC in a H2 atmosphere during one hour. As a result, the materials showed a minor increase in alloying degree, an increase in particle size, a slightly decrease in surface area and a more filled Pt 5d-band. Thermal treatment did not cause any... (Complete abstract click electronic access below)
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Chin, Xiao Yao. "Ni-C electrocatalysts for hydrogen oxidation in low-temperature acidic fuel cells." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610637.

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Gallo, Irã Borges Coutinho. "Preparação e teste de nanocatalisadores 'PT"FE"NI'/'C' e 'PT"FE"CO'/'C' para redução de oxigênio /." Araraquara, 2013. http://hdl.handle.net/11449/92052.

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Orientador: Hebe de Las Mercedes Villullas
Banca: Romeu Cardozo Rocha Filho
Banca: Joelma Perez
Resumo: Neste trabalho foram sintetizadas nanopartículas de Pt, PtFe, PtNi, PtCo, PtFeNi e PtFeCo suportadas em pó de carbono através do método da microemulsão, que foram testadas como potenciais eletrocatalisadores frente a reação de redução do oxigênio (RRO). As propriedades eletrônicas dos materiais foram investigadas por XAS (Espectroscopia de Absorção de Raios X) e as propriedades estruturais e morfológicas por DRX (Difração de Raios X) e MET (Microscopia Eletrônica de Transmissão), respectivamente. A área superficial de platina eletroquimicamente ativa foi determinada a partir de dados de voltametria cíclica, enquanto a atividade eletrocatalítica para a RRO foi estudada em soluções de H2SO4 saturadas com O2, utilizando a técnica do eletrodo de disco rotatório. Em geral, a análise dos materiais binários e ternários mostrou uma diminuição no parâmetro de rede em relação à platina pura, o que é um indicativo da formação de liga. O método de síntese escolhido permitiu a obtenção de cristalitos com faixa de tamanhos em torno de 3 nm. Somente os materiais contendo nanopartículas trimetálicas apresentaram alto grau de aglomeração e uma distribuição não homogênea sobre o carbono suporte. As análises eletroquímicas sugerem que a RRO segue majoritariamente o mecanismo via 4 elétrons em todos os catalisadores estudados nesse trabalho. O estudo das propriedades eletrônicas indica que a presença de Fe, Ni e Co contribui para o preenchimento da banda 5d da platina. Todas estas informações foram correlacionadas na tentativa de se entender a razão pela qual os catalisadores trimetálicos, principalmente o PtFeCo/C, apresentaram atividade superior para a RRO quando comparados com os bimetálicos e a Pt/C. Os materiais ternários foram submetidos a tratamento térmico a 150 ºC em atmosfera de H2 por uma hora... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: In this work, nanoparticles of Pt, PtFe, PtNi, PtCo, PtFeNi and PtFeCo supported on carbon powder were synthesized by a microemulsion method and tested as potential electrocatalysts for the oxygen reduction reaction (ORR). The electronic properties of the materials were investigated by XAS (X-ray Absorption Spectroscopy) and the structural and morphological properties by XRD (X-ray diffraction) and TEM (Transmission Electronic Microscopy), respectively. The platinum electrochemically active surface area was determined from cyclic voltammetry data while the electrocatalytic activity toward the ORR was studied using the rotating disk electrode technique in O2 saturated H2SO4 solutions. Overall, the analyses of the materials showed a decrease in the lattice parameter when compared to pure Pt, which suggests alloy formation. The chosen synthesis method allowed obtaining small crystallites with average size around 3 nm. Only the catalysts containing trimetallic nanoparticles were highly agglomerated and showed an inhomogeneous distribution of particles on the carbon support. The electrochemical analyses suggest that the ORR occurs mainly through the 4 electron mechanism on all catalysts studied in this work. The study of the electronic properties evidenced that the presence of Fe, Ni and Co increases the platinum 5d-band occupancy. All results were correlated aiming a better understanding of why the trimetallic catalysts, particularly PtFeCo/C, have significantly higher ORR activity than bimetallic materials and Pt/C. The trimetallic catalysts were heat treated at 150 ºC in a H2 atmosphere during one hour. As a result, the materials showed a minor increase in alloying degree, an increase in particle size, a slightly decrease in surface area and a more filled Pt 5d-band. Thermal treatment did not cause any... (Complete abstract click electronic access below)
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Book chapters on the topic "C electrocatalyst"

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Alekseenko, Anastasia, Sergey Belenov, Vladimir Guterman, Rui Lin, Natalia Tabachkova, Vadim Volochaev, Elizaveta Moguchikh, Angelina Pavlets, Kirill Paperj, and Vladislav Menschikov. "Activity and Stability of Pt/C and PtM/C Electrocatalysts: In Search of a Compromise." In Springer Proceedings in Physics, 17–30. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19894-7_2.

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Pavlets, Angelina, Anastasia Alekseenko, and Alexey Nikulin. "Influence of Acid Treatment on the Functional Characteristics of PtCu/C Electrocatalysts." In Springer Proceedings in Materials, 25–35. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76481-4_3.

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Nevelskaya, A. K., and S. V. Belenov. "Investigation of the Activity of PtCuAu/C Electrocatalysts in Alcohols Electrooxidation Reaction in Alkaline Media." In Springer Proceedings in Materials, 15–24. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76481-4_2.

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Belenov, Sergey, Vladimir Guterman, Nataliya Tabachkova, Vladislav Menshchikov, Аlina Nevelskaya, and Irina Gerasimova. "Composition, Structure and Stability of PtCu/C Electrocatalysts with Non-uniform Distribution of Metals in Nanoparticles." In Springer Proceedings in Physics, 31–46. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19894-7_3.

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Belenov, Sergey V., Vladislav S. Menshchikov, Alina K. Nevelskaya, Vasiliy V. Pryadchenko, Daria B. Shemet, Vasiliy V. Srabionyan, Anastasia A. Alekseenko, Sergey A. Kirakosyan, and Vladimir E. Guterman. "Post-treatment of Pt-M (M = Cu, Co, Ni)/C Electrocatalysts with Different Distribution of Metals in Nanoparticles: Evolution of Structure and Activity." In Springer Proceedings in Physics, 65–77. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78919-4_5.

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Crisafulli, Rudy, Almir Oliveira Neto, Marcelo Linardi, and Estevam V. Spinacé. "Preparation of PtSn/C skeletal-type electrocatalyst for ethanol oxidation." In Scientific Bases for the Preparation of Heterogeneous Catalysts - Proceedings of the 10th International Symposium, Louvain-la-Neuve, Belgium, July 11-15, 2010, 559–62. Elsevier, 2010. http://dx.doi.org/10.1016/s0167-2991(10)75108-9.

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M. Martins, Guilherme, Najoua Sbei, Geórgia C. Zimmer, and Nisar Ahmed. "C-H Activation/Functionalization via Metalla-Electrocatalysis." In Electrocatalysis [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95517.

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In conventional methods, C−H activations are largely involved in the use of stoichiometric amounts of toxic and expensive metal & chemical oxidants, conceding the overall sustainable nature. Meanwhile, undesired byproducts are generated, that is problematic in the scale up process. However, electrochemical C−H activation via catalyst control strategy using metals as mediators (instead electrochemical substrate control strategy) has been identified as a more efficient strategy toward selective functionalizations. Thus, indirect electrolysis makes the potential range more pleasant, and less side reactions can occur. Herein, we summarize the metalla-electrocatalysis process for activations of inert C−H bonds and functionalization. These Metalla-electrocatalyzed C−H bond functionalizations are presented in term of C−C and C−X (X = O, N, P and halogens) bonds formation. The electrooxidative C−H transformations in the presence of metal catalysts are described by better chemoselectivities with broad tolerance of sensitive functionalities. Moreover, in the future to enhance sustainability and green chemistry concerns, integration of metalla-electrocatalysis with flow and photochemistry will enable safe and efficient scale-up and may even improve reaction times, kinetics and yields.
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Nazir, Roshan, Abhay Prasad, Ashish Parihar, Mohammed S. Alqahtani, and Rabbani Syed. "Colloidal Nanocrystal-Based Electrocatalysts for Combating Environmental Problems and Energy Crisis." In Colloids - Types, Preparation and Applications. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95338.

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The serious threat that human beings face in near future will be shortage of fossil fuel reserves and abrupt changes in global climate. To prepare for these serious concerns, raised due to climate change and shortage of fuels, conversion of excessive atmospheric CO2 into valuable chemicals and fuels and production of hydrogen from water splitting is seen most promising solutions to combat the rising CO2 levels and energy crises. Amoung the various techniques that have been employed electrocatalytic conversion of CO2 into fuels and hydrogen production from water has gained tremendous interest. Hydrogen is a zero carbon-emitting fuel, can be an alternative to traditional fossil fuels. Therefore, researchers working in these areas are constantly trying to find new electrocatalysts that can be applied on a real scale to deal with environmental issues. Recently, colloidal nanocrystals (C-NCs)-based electrocatalysts have gained tremendous attention due to their superior catalytic selectivity/activity and durability compared to existing bulk electrodes. In this chapter, the authors discuss the colloidal synthesis of NCs and the effect of their physiochemical properties such as shape, size and chemical composition on the electrocatalytic performance and durability towards electrocatalytic H2 evolution reaction (EH2ER) and electrocatalytic CO2 reduction reactions (ECO2RR). The last portion of this chapter presents a brief perspective of the challenges ahead.
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Silva, Dionísio F., Almir Oliveira Neto, Eddy S. Pino, Marcelo Linardi, and Estevam V. Spinacé. "Preparation of PtSn/C electrocatalysts using electron beam irradiation." In Scientific Bases for the Preparation of Heterogeneous Catalysts - Proceedings of the 10th International Symposium, Louvain-la-Neuve, Belgium, July 11-15, 2010, 555–58. Elsevier, 2010. http://dx.doi.org/10.1016/s0167-2991(10)75107-7.

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D'Souza, L., and J. R. Regalbuto. "Strong electrostatic adsorption for the preparation of Pt/Co/C and Pd/Co/C bimetallic electrocatalysts." In Scientific Bases for the Preparation of Heterogeneous Catalysts - Proceedings of the 10th International Symposium, Louvain-la-Neuve, Belgium, July 11-15, 2010, 715–18. Elsevier, 2010. http://dx.doi.org/10.1016/s0167-2991(10)75143-0.

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Conference papers on the topic "C electrocatalyst"

1

Chen, Guobao, Hongying Yang, Huamin Zhang, and Hexiang Zhong. "MnxIr1−xO2/C used as bifunctional electrocatalyst in alkaline medium." In 2013 International Conference on Materials for Renewable Energy and Environment (ICMREE). IEEE, 2013. http://dx.doi.org/10.1109/icmree.2013.6893702.

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Chen, Guobao, Hongying Yang, Huamin Zhang, and Hexiang Zhong. "MnxIr1−xO2/C used as bifunctional electrocatalyst in alkaline medium." In 2013 International Conference on Materials for Renewable Energy and Environment (ICMREE). IEEE, 2013. http://dx.doi.org/10.1109/icmree.2013.6893707.

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Merzougui, Belabbes. "Facile Synthesized Mo 2 C Electrocatalyst Supported on Mesoporous Carbon for Hydrogen Generations." In Qatar Foundation Annual Research Conference Proceedings. Hamad bin Khalifa University Press (HBKU Press), 2016. http://dx.doi.org/10.5339/qfarc.2016.eepp3205.

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El-Dera, Sandra Erfan, Ahmed Abd El Aziz, and Ahmed Abd El Moneim. "Evaluation of the Activity of Metal-Oxides as Anode Catalysts in Direct Methanol Fuel Cell." In ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2012 6th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fuelcell2012-91288.

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In the present work, pure iridium oxide (IrO2), and ternary catalysts (IrSnSb-Oxides and RuIrTi-Oxides) are investigated to be used as anode electrocatalysts in The Direct Methanol Fuel Cells (DMFC). Investigations of Methanol Oxidation and Hydrogen Evolution over the catalysts are measured in sulphuric acid as a supportive electrolyte using cyclic voltammetry technique at room temperature (25°C). A specific comparison between the electrocatalytic activities of IrSnSb-Oxides and RuIrTi-Oxides systems is conducted. A comprehensive examination of IrSnSb-Oxides and RuIrTi-Oxides catalysts containing different fractions of the alloying elements are performed to study the effect of varying Iridium Ir content (%) in IrSnSb-Oxides and Ruthenium Ru content (%) in RuIrTi-Oxides on the catalytic activity of ternary catalysts and on the performance of DMFC. It is observed that the electrocatalytic performance of ternary oxides catalysts is strongly dependent on the Ir and Ru content. The generated IrO2 and 33.36% Ru – 1%Ir – 65.64%Ti – Oxides catalysts prove high stability for oxidation of methanol and more proficient electrochemical activity as an anodic electrocatalyst in DMFC at 25°C. The electrochemical measurements of the Hydrogen Evolution Reaction (HER) for metal oxides show that 46.65%Ir – 40.78%Sn – 12.57%Sb sample and 18.75%Ru – 9.35%Ir – 71.9%Ti sample are the superior hydrogen evolution catalysts at 25°C.
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Maleki, Nasim, and Erfan Maleki. "Modeling of Cathode Pt /C Electrocatalyst Degradation and Performance of a PEMFC using Artificial Neural Network." In the The International Conference. New York, New York, USA: ACM Press, 2015. http://dx.doi.org/10.1145/2832987.2833000.

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Wheeldon, I. R., J. C. Amphlett, M. Fowler, M. Hooper, R. F. Mann, B. A. Peppley, and C. P. Thurgood. "Simulation of a 25 kW Steam-Methanol Fuel Processor/PEM Fuel Cell System." In ASME 2003 1st International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2003. http://dx.doi.org/10.1115/fuelcell2003-1738.

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The transition to a hydrogen economy will require an intermediate energy carrier until a sufficient hydrogen infrastructure can be implemented. A likely near-term candidate is the on-board or on-site production of hydrogen from steam-methanol reforming. The low tolerance of PEM fuel cell anode electrocatalyst, to the carbon monoxide produced during reforming, necessitates a hydrogen purification or carbon monoxide clean-up sub-system. Considerable advantages can be gained from the use of a steam-methanol reformer with a palladium-silver alloy membrane, hydrogen purification unit. In the present work we have examined such a system. A simulation comprised of a Polymer Electrolyte Membrane Fuel Cell electrochemical model, a membrane permeation model and a commercially available thermodynamics calculation package was constructed. The case investigated in this work is of a 25 kW nominal DC power generating system. A maximum efficiency of 40% was achieved at reformer and membrane unit conditions of 200°C and 300 psia with 97% conversion of the inlet methanol. The effects of variation in temperature and pressure where also investigated. It was found that the reformer and membrane unit pressure had the most significant effect on overall system efficiency. The system efficiency increases with pressure reaching a maximum at the upper limit of the operating region, 300 psia.
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Garcia, Amanda. "Insights into C-C Coupling in CO2 Electroreduction towards C4 Product." In International Conference on Electrocatalysis for Energy Applications and Sustainable Chemicals. València: Fundació Scito, 2020. http://dx.doi.org/10.29363/nanoge.ecocat.2020.007.

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Reddy, A. Leela Mohana, M. M. Shaijumon, N. Rajalakshmi, and S. Ramaprabhu. "PEM Fuel Cells With Multiwalled Carbon Nanotubes as Catalyst Support Material." In ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2006. http://dx.doi.org/10.1115/fuelcell2006-97274.

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Multi-walled carbon nanotubes (MWNTs) have been synthesized by the pyrolysis of acetylene using hydrogen decrepitated Mischmetal (Mm) based AB3 alloy hydride catalyst. MWNTs have been characterized by SEM, TEM, Raman and XRD studies. Pt-supported MWNTs (Pt/MWNTs) have been prepared by chemical reduction method using functionalized MWNTs. Composites of Pt/MWNTs and Pt/C have been used as electrocatalysts for oxygen reduction reaction in Proton Exchange Membrane Fuel Cell (PEMFC). Cathode catalyst with 50% Pt/MWNTs and 50% Pt/C gives the best performance because of the better dispersion and good accessibility of MWNTs support and the Pt electrocatalysts in the mixture for the oxygen reduction reaction in PEMFC. The paper emphasizes that Pt/C and Pt/MWNTs composites have good potential as catalyst support material in PEMFC.
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Sun, Gongquan, Guoxiong Wang, Suli Wang, Shiyou Yan, Shaohua Yang, and Qin Xin. "Studies on Electrocatalysts, MEAs and Compact Stacks of Direct Alcohol Fuel Cells." In ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2006. http://dx.doi.org/10.1115/fuelcell2006-97244.

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A number of carbon supported bi/multi-metallic Pt-based electrocatalysts with a metal particle-size and shape controllable in nanoscale and a narrow size distribution were prepared by the improved polyol method. Among the electrocatalysts prepared in-house, PtSn/C showed a high direct ethanol fuel cell performance and PtPd/C exhibited a favorable methanol-tolerant property and oxygen-reduction activity. Several MEA fabrication methods such as direct-spray, decal and screen-printing were developed, through which the pore structure and hydrophilic/hydrophobic properties in the MEAs could be controlled desirably. With multi-layer structured electrodes, the maximum power density of 300 mW/cm2 and 240 mW/cm2 for the single cells were achieved at 90 °C under 0.2 MPa pressures of oxygen and air, respectively. Several demonstrations of active and passive compact DMFC systems ranging from sub-watts to 200 watt were fabricated. Some of them were demonstrated in PDA, toy cars, mobile phones and laptop computers.
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Abbo, Hanna S., Ivan R. Green, and Salam J. J. Titinchi. "Synthesis of Highly Dispersed Carbon Supported Platinum Nanocatalyst for Fuel Cells." In ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/fuelcell2011-54669.

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Pt/C and Pt/CNT catalysts were prepared by colloidal method using sodium citrate as a stabilizer, and ethylene glycol as the reducing agent and solvent. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) results showed that the Pt particles were highly dispersed on the support and had a very narrow particle distribution with particle size range of 1.5–2.4 nm for both catalysts. Based on the electrochemical properties characterized by cyclic voltammetry, it was found that the as-synthesized electrocatalysts possessed a significantly higher catalytic activity than those of commercial Pt/C Johnson Matthey catalyst.
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Reports on the topic "C electrocatalyst"

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Stechel, Ellen Beth, Elise E. Switzer, Cy H. Fujimoto, Plamen Borissov Atanassov, Christopher James Cornelius, and Michael R. Hibbs. Nanostructured electrocatalyst for fuel cells : silica templated synthesis of Pt/C composites. Office of Scientific and Technical Information (OSTI), September 2007. http://dx.doi.org/10.2172/952106.

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