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Dissertations / Theses on the topic 'MnO2 Cells'

Author: Grafiati

Published: 6 September 2023

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1

Chen, Yingwen, Liuliu Chen, Peiwen Li, et al. "Enhanced performance of microbial fuel cells by using MnO2/Halloysite nanotubes to modify carbon cloth anodes." PERGAMON-ELSEVIER SCIENCE LTD, 2016. http://hdl.handle.net/10150/621214.

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The modification of anode materials is important to enhance the power generation of MFCs (microbial fuel cells). A novel and cost-effective modified anode that is fabricated by dispersing manganese dioxide (MnO2) and HNTs (Halloysite nanotubes) on carbon cloth to improve the MFCs' power production was reported. The results show that the MnO2/HNT anodes acquire more bacteria and provide greater kinetic activity and power density compared to the unmodified anode. Among all modified anodes, 75 wt% MnO2/HNT exhibits the highest electrochemical performance. The maximum power density is 767.3 mWm(-2

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2

Bouabdalaoui, Laila. "Etude de matériaux d'anodes à base de graphite modifié par des composés fer-soufre : applications aux piles à combustible microbiennes." Thesis, Evry-Val d'Essonne, 2013. http://www.theses.fr/2013EVRY0011/document.

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Une pile à combustible microbiennes (PCM) est un dispositif capable de produire de l’énergie électrique à partir d’énergie chimique grâce à l’activité catalytique des bactéries en présence de combustibles organiques. Ces travaux de thèse ont eu pour objectif la synthèse des nouveaux matériaux d’anode et de cathode qui pourraient constituer des alternatives aux matériaux à base de platine. Coté anode, nous avons synthétisé des matériaux par précipitation chimique sur du graphite en poudre à partir de mélanges contenant des ions ferreux et sulfures. Les caractérisations physicochimiques ont mont

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3

Šmídek, Miroslav. "Kladná elektroda na bázi MnOx pro PEMFC." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219066.

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Construed bachelor work features into problems hydrogen fuel articles and survey on low-temperature fuell elements with polymeric electrolyte (PEMFC). Basic sight work is study feature catalyzers on base MnOx on real fuel cell type PEMFC. Exit are then measured characteristic this way creation fuel cell.

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4

Šubarda, Jiří. "Studium vlastností katalyzátoru na bázi MnOx metodou EQCM." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219069.

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Fuel cell´s have to function and be exploited for the purposes to dawdler were to be designed, behind achievement their requisite feature. To achievement these needs is then need use fit chemical accelerator about specific features and ensure his fit incorporated to the article. In those work in the concrete will treat of recognition feature chemical accelerator lay on in form inks obtained from powdery matters, like chemical accelerator will on used electrode aggradation MnOx. Recognition feature chemical accelerator will conducted by the help of method EQCM (Electrochemical Quartz Crystal Mi

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5

Mehta, Sean. "Investigation of capacity fade in flat-plate rechargeable alkaline MnO₂/Zn cells." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/56584.

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The rechargeable alkaline manganese dioxide-zinc (RAM™) battery system has been difficult to commercially develop in the past due to irreversible phase formation and progressive and cumulative capacity fade. This system has many advantages however, such as low cost and environmentally sustainable materials, long shelf life, moderate energy density, and safety. A flat-plate architecture was developed and investigated in half and full-cell apparatuses with the goal of understanding and improving cumulative capacity fade in the electrolytic manganese dioxide (EMD) cathode. Two types of cathode cu

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6

Pléha, David. "Měření vlastností oxidů manganu (MnOx) metodou EQCM." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218701.

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The present work deals with the use of manganese oxide as a catalyst for positive electrode of fuel cells. The theoretical part is to analyze the problem of fuel cells, focusing on lowtemperature fuel cells. Are discussed and the methods of measurement and evaluation of properties of manganese oxide layer. The practical part deals with doping electrolytic manganese dioxide salts of divalent metals and monitoring their behavior in the cyclic voltammetry by the EQCM method.

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7

Kamrla, David. "Modifikace vlastností kladné elektrody na bázi MnOx pro AFC pomocí dopantů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219065.

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The subject of this graduation thesis is low-cost alkaline power cells and especially electrodes with alternative catalyst made of MnOx + dopant. The thesis expands the bachelor´s thesis [1] and previous research [4] [12] [13] [14]. Volt-ampere characteristics and power characteristics of the katodes for AFC, subsidized with various dopants, are the outcome of this project. The project presents the optimalisation of preparation process of AFC electrodes. The aim is to prepair several electrodes with identical construction, which varies only with the type of the dopant.

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8

Podal, Pavel. "Studium vlastností katalyzátoru na bázi MnOx s využitím RRDE." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219064.

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This master thesis deals with qualifications of the catalytic materials for positive electrode low-temperature fuel cells. The teoretical part focuses on the physical and chemical properties of low-temperature fuel cells. There are described methods of hydrodynamic RDE and RRDE. RRDE study utilizes methods linear and cyclic voltammetry for qualifying performance of catalytic materials and presentation of results. The practical part describes the preparation various types of carbon materials. There are monitored the oxygen reduction using RRDE. Catalytic materials are evaluated: CV, stability,

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9

Kováč, Martin. "Katalyzátory pro kladnou elektrodu kyslíko-vodíkového palivového článku." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218699.

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Master's thesis deals with new methods of preparing catalytic materials for positive electrode of an oxygen-hydrogen fuel cell and the influence of potassium permanganate or doping agent molar mass change on theirs attributes. Further it studies the use of proper measuring methods designed to qualify theirs attributes and the presentation of achieved results. In particular methods of linear sweep and cyclic voltammetry and the processing of data using Koutecky-Levich and Tafel plot and wave log analysis. Values of half-wave and onset potential and kinetic coefficient have been measured and cal

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10

Chan, Kara Y. "MECHANISMS OF TRINUCLEOTIDE REPEAT INSTABILITY DURING DNA SYNTHESIS." UKnowledge, 2019. https://uknowledge.uky.edu/toxicology_etds/29.

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Genomic instability, in the form of gene mutations, insertions/deletions, and gene amplifications, is one of the hallmarks in many types of cancers and other inheritable genetic disorders. Trinucleotide repeat (TNR) disorders, such as Huntington’s disease (HD) and Myotonic dystrophy (DM) can be inherited and repeats may be extended through subsequent generations. However, it is not clear how the CAG repeats expand through generations in HD. Two possible repeat expansion mechanisms include: 1) polymerase mediated repeat extension; 2) persistent TNR hairpin structure formation persisting in the

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11

Le, Cras Frédéric. "Oxydes Li-Mn-O pour accumulateurs au lithium : synthèses nouvelles, aspects structuraux et électrochimiques." Phd thesis, Université Joseph Fourier (Grenoble), 1996. http://tel.archives-ouvertes.fr/tel-00530193.

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Ce mémoire décrit la synthèse, la caractérisation – notamment thermogravimétrique et structurale – et les propriétés d'intercalation électrochimique du lithium de plusieurs types d'oxydes de manganèse. On décrit tout d'abord la préparation d'une 'ramsdellite synthétique', à faible taux de défauts structuraux de type rutile. Les oxydes de manganèse lamellaires (phyllomanganates) ont donné lieu à une nouvelle voie de synthèse du phyllomanganate de lithium par une succession de réactions topotactiques (échanges d'ions) à basse température. Sa stabilité thermique et ses propriétés d'intercalation

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12

Lauret, Hervé. "Propriétés électriques et électrochimiques de manganites de lanthane dopées comme matériau de cathode pour pile à combustible à oxyde électrolyte solide." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0053.

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Ce travail consiste en l'etude de materiaux de cathode pour les piles a combustible haute temperature. Ces materiaux ont pour formule generale la1-xsrxmno3 et (la1-yyy)0,5sr0,5mno3. Dans un premier chapitre nous faisons le point sur l'etat des recherches sur les piles a combustible a oxyde electrolyte solide et leurs constituants. Le deuxieme chapitre presente la synthese des echantillons ainsi que les differents dispositifs de mesures. Le chapitre trois est consacre a la caracterisation physique et electrique des echantillons. Nous avons montre en particulier que le dopage a l'yttrium diminua

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13

Huang, Hao Long, and 黃皓瓏. "Effect of MnO2 Catalyst Added to Different Carbon Materials on Air Cathode Characteristics of Microbial Fuel Cells." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/76k29n.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>106<br>Nowadays, manganese dioxide (MnO2) is mainly used as a catalyst in chemical reactions, such as oxygen production; or as an oxidant in an acidic solution, its characteristics have large porosity and low polarization, and can be compressed in a certain space. More manganese powder has good electrode characteristics. However, micro fuel cells have poor surface area due to very small electrode surface area. Under the condition that the surface area of the electrode is very small, carbon dioxide such as carbon black, carbon nanotubes and graphene can be mixed to im

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14

"Pt/Pt Alloy and Manganese Dioxides Based Oxygen Reduction Reaction Catalysts for Low-Temperature Fuel Cells." Doctoral diss., 2019. http://hdl.handle.net/2286/R.I.54845.

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abstract: The fuel cell is a promising device that converts the chemical energy directly into the electrical energy without combustion process. However, the slow reaction rate of the oxygen reduction reaction (ORR) necessitates the development of cathode catalysts for low-temperature fuel cells. After a thorough literature review in Chapter 1, the thesis is divided into three parts as given below in Chapters 2-4. Chapter 2 describes the study on the Pt and Pt-Me (Me: Co, Ni) alloy nanoparticles supported on the pyrolyzed zeolitic imidazolate framework (ZIF) towards ORR. The Co-ZIF and NiCo-ZI

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15

Kishore, Brij. "Electrochemical Investigations Related to the Next Generation Sodium and Potassium Batteries." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4232.

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The commercialization of Li-ion battery (LIB) in 1990s by Sony Corporation has led to its applications in portable electronic devices such as mobile phones, cameras, laptop computers, etc. Initially, the energy density of commercial LIB was only about 120 Wh Kg-1. However, with sustained improvements in properties of various cell components, the present-day LIB provides energy density of about 250 Wh Kg-1. With future use envisaged for mobility applications such as electric vehicles, research activities have gained momentum for development of high energy density Li-S and Li-O2 batteries. Howev

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16

Tsai, Chih-Teng, and 蔡志騰. "Preparation and Characterization of MnO2 Photocatalyst for Bifunctional Photoelectrochemical Fuel Cell." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/g4e466.

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碩士<br>國立東華大學<br>光電工程學系<br>100<br>Hydrogen is now considered as a charming alternative to fossil fuels. Since the environmental degradation problem and increased energy demand while reducing the fossil energy are forcing various countries to take an aggressive stance for environmental friendly alternative power source. In this study, in order to develop the bi-functional photoelectrochemical cell assembly with hydrogen/oxygen generation, we propose to establish the nano-complex photocatalyst process, MEA technology, surface modified technology, and then combine all components in photoelectroche

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17

Ragupathy, P. "Studies On Nanostructured Transition Metal Oxides For Lithium-ion Batteries And Supercapacitoris." Thesis, 2009. https://etd.iisc.ac.in/handle/2005/1024.

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Rechargeable Li-ion batteries and supercapacitors are the most promising electrochemical energy storage devices in terms of energy density and power density, respectively. Recently, nanostructured materials have gained enormous interest in the field of energy technology as they have special properties compared to the bulk. Commercially available Li-ion batteries, which are the most advanced among the rechargeable batteries, utilize microcrystalline transition metal oxides as cathode materials which act as lithium insertion hosts. To explore better electrochemical performance the use of nanomat

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18

Ragupathy, P. "Studies On Nanostructured Transition Metal Oxides For Lithium-ion Batteries And Supercapacitoris." Thesis, 2009. http://hdl.handle.net/2005/1024.

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Rechargeable Li-ion batteries and supercapacitors are the most promising electrochemical energy storage devices in terms of energy density and power density, respectively. Recently, nanostructured materials have gained enormous interest in the field of energy technology as they have special properties compared to the bulk. Commercially available Li-ion batteries, which are the most advanced among the rechargeable batteries, utilize microcrystalline transition metal oxides as cathode materials which act as lithium insertion hosts. To explore better electrochemical performance the use of nanomat

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19

Huang, Yu-Ling, and 黃鈺玲. "Study on Energy Management System for Hydrogen Fuel Cell/Li-MnO2 Battery Electric Range Extended Scooter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/m5wz72.

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碩士<br>國立臺北科技大學<br>車輛工程系所<br>102<br>According to current marketed electric scooter, the biggest problem is lack of cruising range. In the light of this, this study presents a hydrogen fuel cell hybrid range extended scooter, which consisted of 54V/24Ah Li-MnO2 battery and 200W hydrogen fuel cell. And use the wireless router to connect your tablet to make it through WiFi connection becomes monitor. This study focus on energy management system, the conversion process improvements measurement method of battery capacity (State of Charge, SOC). And write a program which update battery capacity to pr

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20

Penki, Tirupathi Rao. "High Capacity Porous Electrode Materials of Li-ion Batteries." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/2907.

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Lithium-ion battery is attractive for various applications because of its high energy density. The performance of Li-ion battery is influenced by several properties of the electrode materials such as particle size, surface area, ionic and electronic conductivity, etc. Porosity is another important property of the electrode material, which influences the performance. Pores can allow the electrolyte to creep inside the particles and also facilitate volume expansion/contraction arising from intercalation/deintercalation of Li+ ions. Additionally, the rate capability and cycle-life can be enhanced

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21

Penki, Tirupathi Rao. "High Capacity Porous Electrode Materials of Li-ion Batteries." Thesis, 2014. http://hdl.handle.net/2005/2907.

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Lithium-ion battery is attractive for various applications because of its high energy density. The performance of Li-ion battery is influenced by several properties of the electrode materials such as particle size, surface area, ionic and electronic conductivity, etc. Porosity is another important property of the electrode material, which influences the performance. Pores can allow the electrolyte to creep inside the particles and also facilitate volume expansion/contraction arising from intercalation/deintercalation of Li+ ions. Additionally, the rate capability and cycle-life can be enhanced

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22

Wu, Wei-Hsuan, and 吳維軒. "A Study of Hydrogen Fuel Cell/Li-MnO2 Battery Duel Power Sources Electric Scooter Power Management Based on Fuzzy Logic." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/s9fbr8.

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碩士<br>國立臺北科技大學<br>車輛工程系所<br>101<br>To improve the driving range, the study presents a dual power system consisted of 54V/24Ah Li-MnO2 battery and 100W hydrogen fuel cell which is additional installed for range extender. We present two power management strategies that limit speed and acceleration capability. Finally we use ECE40 cycle to validate these two way can upgrade the range of the system. Speed lamination way could add 6 km .The maximum of speed are 50km/h、40km/h、30km/h when SOC (State of Charge) are 60-100%、40-60% and 0-40%，the power of depletion from 2188W to 1270W decline margin is 4

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