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Dissertations / Theses on the topic 'Proton exchange fuel cells'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Ion, Mihaela Florentina. "Proton transport in proton exchange membrane fuel cells /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p3164514.

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2

Liu, Ping. "Composite proton exchange membranes for fuel cells." Diss., Connect to online resource - MSU authorized users, 2006.

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3

Ergun, Dilek. "High Temperature Proton Exchange Membrane Fuel Cells." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610803/index.pdf.

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It is desirable to increase the operation temperature of proton exchange membrane fuel cells above 100oC due to fast electrode kinetics, high tolerance to fuel impurities and simple thermal and water management. In this study<br>the objective is to develop a high temperature proton exchange membrane fuel cell. Phosphoric acid doped polybenzimidazole membrane was chosen as the electrolyte material. Polybenzimidazole was synthesized with different molecular weights (18700-118500) by changing the synthesis conditions such as reaction time (18-24h) and temperature (185-200oC). The formation of po

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4

Oyarce, Alejandro. "Electrode degradation in proton exchange membrane fuel cells." Doctoral thesis, KTH, Tillämpad elektrokemi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-133437.

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The topic of this thesis is the degradation of fuel cell electrodes in proton exchange membrane fuel cells (PEMFCs). In particular, the degradation associated with localized fuel starvation, which is often encountered during start-ups and shut-downs (SUs/SDs) of PEMFCs. At SU/SD, O2 and H2 usually coexist in the anode compartment. This situation forces the opposite electrode, i.e. the cathode, to very high potentials, resulting in the corrosion of the carbon supporting the catalyst, referred to as carbon corrosion. The aim of this thesis has been to develop methods, materials and strategies to

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5

Shi, Jinjun. "Composite Membranes for Proton Exchange Membrane Fuel Cells." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1214964058.

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6

DeLashmutt, Timothy E. "Modeling a proton exchange membrane fuel cell stack." Ohio : Ohio University, 2008. http://www.ohiolink.edu/etd/view.cgi?ohiou1227224687.

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7

Xiao, Zhiyong. "Monolithic integration of proton exchange membrane microfuel cells /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?ECED%202008%20XIAO.

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8

Hattenberger, Mariska. "Composite proton exchange membranes for intermediate temperature fuel cells." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6194/.

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Intermediate temperature (IT) proton exchange membrane fuel cells (PEMFCs) offer a future that does not rely on the burning of fossil fuels, but dictate durable and high performance component materials. At operating conditions of 120 °C and 50 % relative humidity (RH), composite proton exchange membranes (PEMs) offer increased performance due to enhanced water uptake and retention resulting from the hydrophilic filler material. This project aimed to relate measured data for composite PEMs with literature data on Nafion-graphene oxide (GO) PEMs. In order to achieve this, the membrane casting me

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9

Einsla, Brian Russel. "High Temperature Polymers for Proton Exchange Membrane Fuel Cells." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/27320.

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Novel proton exchange membranes (PEMs) were investigated that show potential for operating at higher temperatures in both direct methanol (DMFC) and H2/air PEM fuel cells. The need for thermally stable polymers immediately suggests the possibility of heterocyclic polymers bearing appropriate ion conducting sites. Accordingly, monomers and random disulfonated poly(arylene ether) copolymers containing either naphthalimide, benzoxazole or benzimidazole moieties were synthesized via direct copolymerization. The ion exchange capacity (IEC) was varied by simply changing the ratio of disulfonated

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10

Marani, Debora. "Development of hybrid proton-conducting polymers for proton exchange membrane fuel cells." Aix-Marseille 1, 2006. http://www.theses.fr/2006AIX11002.

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Le développement d'électrolytes polymères de nouvelle génération est un pré requis essentiel pour la commercialisation à grande échelle des piles à combustibles à membrane polymérique. Ces conducteurs protoniques doivent présenter une bonne stabilité morphologique, hydrolytique, mécanique et une conductivité appropriée à une température supérieure à 100°C à basse humidité relative. Dans ce travail, diverses stratégies sont explorées pour la synthèse de polymères conducteurs hybrides organiques-inorganiques nanocomposites à partir de polymères thermoplastiques aromatiques. L'emploi de matériaux

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11

Choi, Pyoungho. "Investigation of thermodynamic and transport properties of proton-exchange membranes in fuel cell applications." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0430104-094215/.

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12

Zhang, Jingxin. "Investigation of CO tolerance in proton exchange membrane fuel cells." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0708104-193007/.

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13

Lee, Heon Joong Choe Song-Yul. "Modeling and analysis of a PEM fuel cell system for a quadruped robot." Auburn, Ala, 2009. http://hdl.handle.net/10415/1786.

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14

Kwan, Siu Ming. "Zeolite-based micro fuel cells /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CBME%202008%20KWAN.

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15

Parikh, Harshil R. "Modeling and analysis of proton exchange membrane fuel cell." Ohio : Ohio University, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1088438486.

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16

Maasdorp, Lynndle Caroline. "Temperature proton exchange membrane fuel cells in a serpentine design." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_1316_1307961639.

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<p>The aim of my work is to model a segment of a unit cell of a fuel cell stack using numerical methods which is classified as computational fluid dynamics and implementing the work in a commercial computational fluid dynamics package, FLUENT. The focus of my work is to study the thermal distribution within this segment. The results of the work aid in a better understanding of the fuel cell operation in this temperature range. At the time of my investigation experimental results were unavailable for validation and therefore my results are compared to previously published results published. The

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17

Pasricha, Sandip. "Modeling and Transient Degradation of Proton Exchange Membrane Fuel Cells." Thesis, Montana State University, 2006. http://etd.lib.montana.edu/etd/2006/pasricha/PasrichaS0506.pdf.

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This thesis presents a model based approach to describe proton exchange membrane (PEM) fuel cell degradation with time. This degradation study involves analysis of voltage and current profiles of PEM membranes under transient load conditions. The data is collected from 80 membranes in an Independence1000 1000W PEM system over the life span of the membrane. The thesis also presents PEM fuel cell models developed and validated on a 500W SR-12 commercial PEM stack. Several static models from the literature are reviewed in terms of physical effects, parameterized for identification, and compared u

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18

Dong, Daxuan. "Polyphenylene Sulfonic Acids As Proton Exchange Membranes For Fuel Cells." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1332355539.

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19

Choi, Jonghyun. "Nanofiber Network Composite Membranes for Proton Exchange Membrane Fuel Cells." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1260461818.

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20

Ahn, Jong-Woo. "Design and analysis of air and coolant control for a polymer electrolyte membrane fuel cell." Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Theses/AHN_JONGWOO_52.pdf.

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21

Christian, Joel B. "Tungsten fuel cell catalysts." Diss., Online access via UMI:, 2007.

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22

Jia, Nengyou. "Electrochemistry of proton-exchange-membrane electrolyte fuel cell (PEMFC) electrodes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0019/MQ54898.pdf.

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23

Bai, He. "High temperature proton-exchange and fuel processing membranes for fuel cells and other applications." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1204732417.

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24

Primucci, Mauricio. "Experimental characterization and diagonosis tools for proton exchange membrane fuel cells." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/96767.

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A fuel cell is a device that gives electric power directly from electrochemical reduction and oxidation reactions. PEM fuel cells present some properties that make them appropriate for portable and transport applications: high efficiency, no emissions, solid electrolyte, low operating temperatures and high power density. However, some technical problems can be improved, durability of the materials and the appropriate control of the operating conditions. One important aspect of the operating conditions is the water management. The right water content is needed in the electrolyte and catalys

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25

Alayyaf, Abdulmajeed A. "Synthesis of Two Monomers for Proton Exchange Membrane Fuel Cells (PEMFCs)." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etd/3015.

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The overall goal of this research is to synthesize two different monomers for proton exchange membrane (PEM) Fuel Cells. Such monomers are proposed to be polymerized to improve the efficiency and compatibility of electrodes and electrolytes in PEM fuel cells. The first target is to synthesize 4-diazonium-3-fluoro PFSI zwitterionic monomer. Three steps were carried out in the lab. First one was the ammonolysis of 3-fluoro-4-nitrobenzenesulfonyl chloride. Second reaction was the bromination of Nafion monomer. The next coupling reaction, between brominated Nafion monomer and the 3-fluoro-4-nitrob

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26

Singer, Simcha Lev. "Low platinum loading electrospun electrodes for proton exchange membrane fuel cells." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38280.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.<br>Includes bibliographical references (p. 104-106).<br>An experimental study was performed to evaluate the utility of electrospun carbon nanofiber supports for sputtered platinum catalyst in proton exchange membrane fuel cells. The performance of the sputtered nanofiber supports was similar to that of sputtered commercial gas diffusion layers in single cell fuel cell tests. However, sputtered platinum electrodes performed significantly worse than commercial thin film electrodes due to high activation

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27

Tian, Feng. "Theoretical Studies on Electrode Reactions in Proton Exchange Membrane Fuel Cells." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1291339549.

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28

Cheddie, Denver Faron. "Computational modeling of intermediate temperature proton exchange membrane (PEM) fuel cells." FIU Digital Commons, 2006. http://digitalcommons.fiu.edu/etd/2124.

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A two-phase three-dimensional computational model of an intermediate temperature (120 - 190 ˚C) proton exchange membrane (PEM) fuel cell is presented. This represents the first attempt to model PEM fuel cells employing intermediate temperature membranes, in this case, phosphoric acid doped polybenzimidazole (PBI). To date, mathematical modeling of PEM fuel cells has been restricted to low temperature operation, especially to those employing Nafion® membranes; while research on PBI as an intermediate temperature membrane has been solely at the experimental level. This work is an advancement in

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29

Rezaei, Niya Seyed Mohammad. "Process modeling of impedance characteristics of proton exchange membrane fuel cells." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/53653.

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The impedance characteristics of proton exchange membrane (PEM) fuel cells are studied and analyzed in this thesis. The modeling approaches presented in literature are thoroughly reviewed and categorized as the measurement-modeling and process-modeling approaches. In the former category, a hypothetical equivalent circuit which has the impedance characteristics similar to measured impedances is presented. Since the equivalent circuit is not directly resulted from the physical and chemical properties of the PEM fuel cells, the majority of the measurement-modeling approaches lead to dubious concl

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30

SANTORO, THAIS A. de B. "Estudo tecnologico de celulas a combustivel experimentais a membrana polimerica trocadora de protons." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11174.

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Made available in DSpace on 2014-10-09T12:49:10Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:00:37Z (GMT). No. of bitstreams: 1 09831.pdf: 4253435 bytes, checksum: c758abc7c04ca544bdc0f231316160f0 (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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31

Zhou, Zhen. "Development of polymer electrolyte membranes for fuel cells to be operated at high temperature and low humidity." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/22559.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2007.<br>Committee Chair: Wong, C.P.; Committee Co-Chair: Liu, Meilin; Committee Member: Barefield, Kent; Committee Member: Collard, David; Committee Member: Fahrni, Christoph.

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32

Rodgers, Steven Francis. "Simulation of PEM fuel cells: validation of model and incorporation of humidity dynamics." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2010. http://scholarsmine.mst.edu/thesis/pdf/Rodgers_09007dcc807d8717.pdf.

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Thesis (M.S.)--Missouri University of Science and Technology, 2010.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed July 29, 2010) Includes bibliographical references (p. 64-67).

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33

Pan, Jingjing. "Poly[4(5)-vinylimidazole]/polyvinylidene fluoride composites as proton exchange membranes /." Online version of thesis, 2009. http://hdl.handle.net/1850/10285.

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34

Shan, Yuyao Choe Song-Yul. "Dynamic modeling of polymer electrolyte membrane fuel cell stack with 1D and 2D CFD techniques." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Theses/SHAN_YUYAO_58.pdf.

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35

Joseph, Krishna Sathyamurthy. "Hybrid direct methanol fuel cells." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44777.

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A new type of fuel cell that combines the advantages of a proton exchange membrane fuel cells and anion exchange membrane fuel cells operated with methanol is demonstrated. Two configurations: one with a high pH anode and low pH cathode (anode hybrid fuel cell (AHFC)),and another with a high pH cathode and a low pH anode (cathode hybrid fuel cell (CHFC)) have been studied in this work. The principle of operation of the hybrid fuel cells were explained. The two different hybrid cell configurations were used in order to study the effect of the electrode fabrication on fuel cell performance. Furt

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36

Chedester, R. Clint. "Transport phenomena in microchannels and proton exchange membrane assemblies of fuel cells." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17825.

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37

Yazaydin, Ahmet Ozgur. "Investigations Of New Horizons On H2/o2 Proton Exchange Membrane Fuel Cells." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1054402/index.pdf.

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Proton exchange membrane fuel cells are electrochemical devices which convert the chemical energy of hydrogen into electrical energy with a high efficiency. They are compact and produce a powerful electric current relative to their size. Different from the batteries they do not need to be recharged. They operate as long as the fuel is supplied. Fuel cells, therefore, are considered as one of the most promising options to replace the conventional power generating systems in the future. In this study five PEMFCs<br>namely EAE1, AOY001, AOY002, AOY003 and AOY004 were manufactured with different m

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38

Yurdakul, Ahmet Ozgur. "Acid Doped Polybenzimidazole Membranes For High Temperature Proton Exchange Membrane Fuel Cells." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608506/index.pdf.

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Acid Doped Polybenzimidazole Membranes for High Temperature Proton Exchange Membrane Fuel Cells Author: Ahmet &Ouml<br>zg&uuml<br>r Yurdakul One of the most popular candidates for high temperature PEMFC&rsquo<br>s is phosphoric acid doped polybenzimidazole (PBI) membrane due to its thermal and mechanical stability. In this study, high molecular weight PBI was synthesized by using PPA polymerization. The stirring rate of reaction solution was optimized to obtain high molecular weight. The inherent viscosity of polymer was measured at four points in 96 percent sulphuric acid solution at 30 degre

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39

Blanco, Mauricio. "Study of selected water management strategies for proton exchange membrane fuel cells." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/36643.

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Proton exchange membrane fuel cells (PEMFC) are a promising energy conversion alternative for a number of applications including automotive, small power generation, and micro applications. However, many issues, such as poor water management and voltage instability, still have to be addressed in order to remove technical barriers to commercialization. In this work, water management issues in PEM fuel cells were investigated in detail with the purpose of developing approaches to reduce the negative effect of liquid water inside the fuel cell. The performance of the PEM fuel cell deteriorates w

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40

Zhang, Xiao. "Preparation and characterization of proton exchange membranes for direct methanol fuel cells." Doctoral thesis, Universitat Rovira i Virgili, 2005. http://hdl.handle.net/10803/8525.

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Due to the petroleum crisis and its consequent emission problems, fuel cells gain an important place in the application of alternative energy. They are a kind of electrochemical device that converts chemical energy directly into electrical energy. The Direct Methanol Fuel Cells (DMFC) use polymer membranes as the electrolyte; the polymer membranes are capable of conducting hydrogen protons. The fuel cell system is still expensive and the proton exchange membrane has contributed significantly the high cost. At present, perfluorosulfonic acid membranes (PFSA) (e.g. Nafion®, by DuPont) have been

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41

Rodrigues, Aida. "The effects of carbon monoxide contamination on proton-exchange membrane fuel cells." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq22388.pdf.

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42

Ous, Talal. "A fundamental study into the performance of proton exchange membrane fuel cells." Thesis, City University London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440687.

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43

Abaoud, Hassan Abdulaziz. "Studies on proton exchange membrane fuel cells with low platinum loading electrodes." Thesis, Cranfield University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422711.

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44

Ndzuzo, Linathi. "Platinum based catalysts for the cathode of proton exchange membrane fuel cells." University of the Western Cape, 2018. http://hdl.handle.net/11394/6749.

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>Magister Scientiae - MSc<br>Oxygen reduction reaction (ORR) is carried out in the cathode of the proton exchange membrane fuel cell (PEMFC) and it is known for its sluggish kinetics and the existence of two-pathway mechanism, related with the production of water and hydrogen peroxide. Nowadays, the design of novel cathode catalysts that are able to generate both high oxygen reduction currents and water as main product is a challenge since it causes an enhancement in the performance of PEMFC. Generally, these catalysts are composed of platinum nanoparticles, bearing in mind its high activity t

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45

Hill, Melinda Lou. "Polymeric and Polymer/Inorganic Composite Membranes for Proton Exchange Membrane Fuel Cells." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/37597.

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Several types of novel proton exchange membranes which could be used for both direct methanol fuel cells (DMFCs) and hydrogen/air fuel cells were investigated in this work. One of the main challenges for DMFC membranes is high methanol crossover. Nafion, the current perfluorosulfonic acid copolymer benchmark membrane for both DMFCs and hydrogen/air fuel cells, shows very high methanol crossover. Directly copolymerized disulfonated poly(arylene ether sulfone)s copolymers doped with zirconium phosphates and phenyl phosphonates were synthesized and showed a significant reduction in methanol pe

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46

Todd, Devin Garret Zech. "Novel transport layer characterization and synthesis for proton exchange membrane fuel cells." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/56235.

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Fuel cells are a promising energy conversion technology compatible with developing renewably sourced primary energy distribution. Proton exchange membrane (PEM) fuel cells are particularly suitable for automotive and portable applications. The present thesis advances novel PEM fuel cell porous transport layer (PTL) characterization and materials research. These layers link macro and nano scales by mediating energy and mass transport between reactant distribution channels and catalyst layers. Contemporary commercial PTLs are limited in selection. Moreover, typical characterization methods ignor

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47

Redmond, Erin Leigh. "Cathode durability in PEM fuel cells." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50330.

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Proton exchange membrane (PEM) fuel cells are competitive with other emerging technologies that are being considered for automotive transportation. Commercialization of PEM fuel cells would decrease emissions of criteria pollutants and greenhouse gases and reduce US dependence on foreign oil. However, many challenges exist that prevent this technology from being realized, including power requirements, durability, on-board fuel storage, fuel distribution, and cost. This dissertation focuses on fuel-cell durability, or more specifically catalyst stability. New techniques to comprehensively obse

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48

Isikel, Lale. "Design and characterization of nonwoven fabrics for gas diffusion layer in polymer electrolyte membrane fuel cell." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Theses/ISIKEL_LALE_21.pdf.

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49

Chen, Cheng. "Membrane degradation studies in PEMFCs." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29712.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2010.<br>Committee Chair: Fuller, Thomas; Committee Member: Beckham, Haskell; Committee Member: Hess, Dennis; Committee Member: Koros, William; Committee Member: Meredith, Carson. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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50

Sombatmankhong, Korakot. "The development and characterisation of microfabricated polymer electrolyte membrane fuel cells." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610026.

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