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Dissertations / Theses on the topic 'Pt-free'

Author: Grafiati

Published: 6 September 2023

Last updated: 31 July 2025

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1

Eckardt, Markus [Verfasser]. "ORR activity and stability of Pt-based and Pt-free catalysts for PEMFC applications / Markus Eckardt." Ulm : Universität Ulm, 2020. http://d-nb.info/1203716257/34.

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2

Marzorati, S. "PT-FREE NANO- AND MICRO-STRUCTURED CARBONS FOR ELECTROCHEMICAL OXYGEN REDUCTION REACTION." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/332529.

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Oxygen reduction reaction (ORR) catalysts are of crucial importance in developing low- and medium-temperature fuel cells, as PEMFCs (Polymer Electrolyte Membrane Fuel Cells), from which sizeable energy saving and reduction of greenhouse gas emission are expected in comparison with the use of coal and oil based fuels in thermal engines. The same electrochemical oxygen reduction reaction takes place in oxygen depolarized cathodes (ODC) in chlor-alkali electrolysis, replacing the conventional hydrogen evolving cathode, gaining about 30% energy consumption reduction in the overall process. At pres

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3

Kashyap, V. "High-performance Pt-free oxygen reduction reaction electrocatalysts derived from carbon supported spinel cobalt ferrite and Co/Fe-nitrogen coordinated active centers for advanced energy applications." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2019. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/4595.

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Although the metal oxides are capable of displaying interesting catalytic activity characteristics, the intrinsic activities of these types of systems are found to be largely depending on other parameters such as particle size, morphology, and how well the catalyst particles are dispersed on a conducting substrate and additionally the surface intermediates involved in the process. Herein, we have explored the close relation of particle size, dispersion characteristics of the active particles on a conducting carbon, substitution effect of other metals and controlled interplay of the surface int

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4

Manandhar, Sudha. "Free Radical Induced Oxidation, Reduction and Metallization of NiSi and Ni(Pt)Si Surfaces." Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc31542/.

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NiSi and Ni(Pt)Si, and of the effects of dissociated ammonia on oxide reduction was carried out under controlled ultrahigh vacuum (UHV) conditions. X-ray photoelectron spectroscopy (XPS) has been used to characterize the evolution of surface composition. Vicinal surfaces on NiSi and Ni(Pt)Si were formed in UHV by a combination of Ar+ sputtering and thermal annealing. Oxidation of these surfaces in the presence of either O+O2 or pure O2 at room temperature results in the initial formation of a SiO2 layer ~ 7 Å thick. Subsequent exposure to O2 yields no further oxidation. Continued exposure to

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5

Zhu, Qing Shih Wei-Heng Shih Wan Y. "Characterization and application of piezoelectric microcantilever sensors fabricated from substrate-free PMN-PT layers /." Philadelphia, Pa. : Drexel University, 2008. http://hdl.handle.net/1860/2967.

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6

Ciubotariu, Dragos. "Design, Modeling, Fabrication and Control of PMN-PT Piezoelectric Systems." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2048/document.

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Ce travail propose l’utilisation d’un nouveau matériau, appelé PMN-PT, qui continue aider la miniaturisation des systèmes complexes, utilisés dans des différentes technologies. Le travail est présenté dans le cadre de collaboration entre deux projets, MIOP et ADMAN. Les besoins tient compte que les actionneurs soient capables de délivrer de haute déplacement tout en conservant la simplicité et la fiabilité du système. L’accent est mis sur la polyvalence de ce matériau piézo-électrique, PMN-PT, en raison de ses propriétés électro-mécanique. Le travail comprend un aperçu sur quoi influence les p

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7

Maier, Jan Richard [Verfasser], Todd B. [Gutachter] Marder, and Bernd [Gutachter] Engels. "Investigations of Metal-free Cannibalistic Hexadehydro-Diels-Alder and Pt-catalyzed Dimerization Reactions of Linked Aryl Bisdiynes / Jan Richard Maier ; Gutachter: Todd B. Marder, Bernd Engels." Würzburg : Universität Würzburg, 2021. http://d-nb.info/1236548043/34.

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8

Gaddam, Sneha Sen. "Effect of Fluorine and Hydrogen Radical Species on Modified Oxidized Ni(pt)si." Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc28421/.

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NiSi is an attractive material in the production of CMOS devices. The problem with the utilization of NiSi, is that there is no proper method of cleaning the oxide on the surface. Sputtering is the most common method used for the cleaning, but it has its own complications. Dry cleaning methods include the reactions with radicals and these processes are not well understood and are the focus of the project. Dissociated NF3 and NH3 were used as an alternative and XPS is the technique to analyze the reactions of atomic fluorine and nitrogen with the oxide on the surface. A thermal cracker was used

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9

Martins, Thamiris Franco. "A construção da imagem de Dilma Rousseff (PT) na esfera midiática: dissonâncias e convergências narrativas entre a presidente e a candidata à reeleição." Universidade Federal de Juiz de Fora, 2016. https://repositorio.ufjf.br/jspui/handle/ufjf/1274.

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10

Li, Chun-Ting, and 李君婷. "Dye-sensitized Solar Cells:Study of Pt-free Counter Electrodes and Iodide-free Electrolytes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/a2622n.

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博士<br>國立臺灣大學<br>化學工程學研究所<br>103<br>This dissertation aimed to systematically develop Pt-free counter electrodes (CEs) and to design a novel iodide-free electrolyte for the dye-sensitized solar cells (DSSCs) with low-costs and highly cell efficiencies (η’s). This dissertation is divided into two parts: (1) Pt-free CEs (Chapter 3~Chapter 7) and (2) iodide-free electrolyte (Chapter 8). In the case of Pt-free CEs, we aim to reduce the costs of the DSSCs using various electro-catalysts for completely replacing the expensive Pt via the simple, non-vacuum, and low-cost fabrication processes. Accordin

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11

Huang, Yi-June, and 黃奕鈞. "Pt-Free Nanostructural Electrocatalysts for Dye-Sensitized Solar Cells." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/2h8bax.

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博士<br>國立臺灣大學<br>化學工程學研究所<br>107<br>This dissertation aimed to systematically study Pt-free and TCO-free counter electrodes (CEs) with low-costs and highly cell efficiencies (η’s). This dissertation is divided into two parts: (1) Pt-free CEs (Chapter 3 and Chapter 4) and (2) Pt-free and TCO-free CEs (Chapter 5 and Chapter 6). In the case of Pt-free CEs, we aim to reduce the costs of the DSSCs using various electro-catalysts for completely replacing the expensive Pt via the simple, non-vacuum, and low-cost fabrication processes. Accordingly, three types of Pt-free composite films were studied us

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12

Alam, MD Zafir. "Tensile Behavior Of Free-Standing Pt-Aluminide (PtAl) Bond Coats." Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2531.

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Pt-aluminide (PtAl) coatings form an integral part of thermal barrier coating (TBC) systems that are applied on Ni-based superalloy components operating in the hot sections of gas turbine engines. These coatings serve as a bond coat between the superalloy substrate and the ceramic yttrium stabilized zirconia (YSZ) coating in the TBC system and provide oxidation resistance to the superalloy component during service at high temperatures. The PtAl coatings are formed by the diffusion aluminizing process and form an integral part of the superalloy substrate. The microstructure of the PtAl coatings

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13

Alam, MD Zafir. "Tensile Behavior Of Free-Standing Pt-Aluminide (PtAl) Bond Coats." Thesis, 2012. http://hdl.handle.net/2005/2531.

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Pt-aluminide (PtAl) coatings form an integral part of thermal barrier coating (TBC) systems that are applied on Ni-based superalloy components operating in the hot sections of gas turbine engines. These coatings serve as a bond coat between the superalloy substrate and the ceramic yttrium stabilized zirconia (YSZ) coating in the TBC system and provide oxidation resistance to the superalloy component during service at high temperatures. The PtAl coatings are formed by the diffusion aluminizing process and form an integral part of the superalloy substrate. The microstructure of the PtAl coatings

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14

Lin, Yu-Chang, and 林佑錩. "Buckypapers as Pt-Free Counter Electrodes for Dye-Sensitized Solar Cells." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/93999139851426186260.

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碩士<br>東海大學<br>物理學系<br>103<br>Photoelectrochemical dye-sensitized solar cells (DSCs) have attracted much interest in the field of sustainable green energy. However, their counter electrodes (CEs) usually fabricated by the noble metal Pt. To obtain the alternative Pt-Free CEs for DSCs is desirable for the wide deployment of DSCs. Buckypapers (BPs) are prepared in the random and highly interpenetrative configuration of multi-walled carbon nanotubes (MWCNTs), and it has high porosity and conductivity. In this study, BPs are unitized as the CEs for DSCs. From the results of electrochemical impedanc

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15

Wang, Wei-Yan, and 王偉彥. "A STUDY OF DSSCS BASED ON TCO-PT-FREE FLEXIBLE COUNTER ELECTRODES." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/c62e4f.

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碩士<br>大同大學<br>化學工程學系(所)<br>102<br>In this study, we first utilize the high temperature reflux mode to well mix the CNT and PP and followed by thermal compression to prepare the CNT/PP thin plates as a Pt-free and TCO-free CE for DSSCs. After that, to further carry out the test of materials characterizations and electrochemical activity. Although the cell efficiency of DSSCs using CNT/PP based CEs was still much lower than that of DSSC with Pt/FTO CE, it is showed the excellent sheet resistance and flexibleness. Therefore, we used the CNT/PP to replace the FTO glass as a substrate. In order to

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16

Huang, Chiu-Ping, and 黃秋萍. "Highly active Pt-free catalysts membrane electrode assembly in Alkaline Exchange Membrane Fuel Cells." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/4jgk8k.

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17

曾昭瑋. "Fabrication and Characteristics of Au Free Fully Cu InP HBT Using Pt as Diffusion Barrier." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/67275902326423999781.

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碩士<br>國立交通大學<br>材料科學與工程系所<br>92<br>The fully Cu metallization InP heterojunction bipolar transistor (HBT) using Platinum (Pt) as diffusion barrier has been successfully fabricated and demonstrated in this study. The InP HBT uses Ti/Pt/Cu for n-type, Pt/Ti/Pt/Cu for p-type ohmic contacts metals and Ti/Pt/Cu for interconnect metals with Pt as the diffusion barrier. Both the n+-InGaAs/Ti/Pt/Cu/Cr multilayer structure and GaAs/SiNx/Ti/Pt/Cu/Cr structure were stable up to 350oC 30 min annealing as judged from data of AES, XRD, and AFM and from the measurement of the sheet resistance. Current accele

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18

Chen, Szu-Chien, and 陳思蒨. "Applications of PANI and PEDOT as Cathodic Catalysts for Pt-free Dye-Sensitized Solar Cells." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/51424854601972144035.

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碩士<br>國立中央大學<br>化學研究所<br>99<br>Dye-Sensitized Solar Cells (DSSCs) are attractive the third generation thin film solar cells due to their low cost, light weight, colorful, fabricated easily and flexible. Generally, platinum is employed as a catalyst for the cathode in DSSC to catalyze the reduction reaction (I3- to 3I-) of the electrolyte. However, platinum is one of the most expensive materials on the earth. The preparation of Pt counter electrode at high temperature also increases the cost and difficulty in fabricating large-size device. Therefore, extensive studies have been carried out for

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19

Hsiang, Mao-Yu, and 毛鈺翔. "Study on Highly Active Pt-free NiRu Electrocatalyst for Alkaline Hydrogen Oxidation and Evolution Reactions." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/f58p75.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>105<br>Fuel cells have been considered as a potential candidate for alternative energy generation system. Unfortunately, the use of high cost precious Pt catalyst limits its wide spread application. In this study, CNT supported Ni-Ru bimetallic catalyst was successfully synthesized by using hydrothermal method and the catalyst loading can be well controlled about 22-25% as well as good reproducibility, which is applied to hydrogen oxidation reaction (HOR) and hydrogen gas precipitation reaction (HER) under alkaline conditions. The size of the catalyst was obser

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20

Maier, Jan Richard. "Investigations of Metal-free Cannibalistic Hexadehydro-Diels-Alder and Pt-catalyzed Dimerization Reactions of Linked Aryl Bisdiynes." Doctoral thesis, 2021. https://doi.org/10.25972/OPUS-24041.

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The introductory chapter reviews the current state of mechanistic understanding of the hexadehydro-Diels-Alder (HDDA) reaction. With the rapid development of the HDDA reaction from its first discovery in 1997, the question of whether a concerted or stepwise mechanism better describes the thermally activated formation of ortho-benzyne from a diyne and a diynophile has been debated. Mechanistic and kinetic investigations were able to show that this is not a black or white situation, as minor changes can tip the balance. In chapter 2 of this thesis, the catalytic process leading from 1,11-bis(p-t

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21

Ruz, Sichem Guerrero. "Activity in-situ IR and EXAFS spectroscopy studies, and Monte Carlo simulation of the preferential oxidation of carbon monoxide on Nb-promoted Pt/A12O3 catalysts and Pt-free metal oxides catalysts." 2007. http://etd.nd.edu/ETD-db/theses/available/etd-12202007-161930/.

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Thesis (Ph. D.)--University of Notre Dame, 2007.<br>Thesis directed by E. E. Wolf for the Department of Chemical and Biomolecular Engineering. "December 2007." Includes bibliographical references (leaves 196-214).

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22

Lee, Kun-Mu, and 李坤穆. "A Study on Dye-Modified TiO2 Electrode, Gel Polymer Electrolyte and Pt-Free Counter Electrode for Dye-Sensitized Solar Cells." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/19070914806518361549.

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博士<br>國立臺灣大學<br>高分子科學與工程學研究所<br>97<br>The main purpose of this thesis is to investigate the behaviors of new approaches in electrodes (working and counter), sensitizers and gel polymer electrolytes for dye-sensitized solar cells (DSSCs) and discussing the influences on the cell performance and stability of DSSCs. In the first part of this thesis (Chapter 2 and 3), the optimization of solar energy conversion efficiency of DSSCs was investigated by the tuning of TiO2 photoelectrode’s morphology. Double-layered TiO2 photoelectrodes were designed by the coating of TiO2 suspension incorporated with

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23

Nandan, Ravi. "Rational Designing of Bifunctional Electrocatalysts for Electrochemical Energy Conversion and Storage Devices." Thesis, 2017. https://etd.iisc.ac.in/handle/2005/4302.

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Depleting fossil fuels, increasing environmental concerned and looming energy crisis motivates researcher around the globe to explore some of the possible eco-friendly energy alternative resources. Among various available selections, electrochemical energy conversion and storage devices have the potential to serve the portable electronics to automobile sectors. In this regard, direct alkaline methanol fuel cell (DAMFC) is very promising. The efficiency of DAMFC mainly depends upon methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) that take place at anode and cathode o

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24

Kayal, Soubhik. "Enhancing the spin-orbit torque efficiency in Pt/CoFeB/Pt based perpendicularly magnetized systems." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5784.

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Controlling and switching magnetization by the process of current-induced torque has a considerable advantage in lower power consumption for a memory device and spin logic device application. For a heavy metal (HM) / ferromagnet(FM) / heavy metal (HM) based perpendicular magnetic anisotropy system with broken normal space inversion symmetry, current-induced magnetization reversal (CIMR) takes place by spin-orbit torque (SOT) with the assistance of an in- plane magnetic field. For a similar HM/FM/HM-based PMA system having broken lateral symmetry, also known as the quasi-PMA system, t

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