Dissertations / Theses on the topic 'Polymer Electrolyte Fuel Cells Studied'
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Park, Gu-Gon. "Studies on the performance enhancement of polymer electrolyte fuel cells." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136358.
Full textLiu, Chen. "Structural Studies of Pt-Based Electrocatalysts for Polymer Electrolyte Fuel Cells." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263807.
Full text京都大学
新制・課程博士
博士(総合学術)
甲第23346号
総総博第19号
京都大学大学院総合生存学館総合生存学専攻
(主査)教授 寶 馨, 教授 内本 喜晴, 特定教授 橋本 道雄
学位規則第4条第1項該当
Doctor of Philosophy
Kyoto University
DFAM
Choo, Hyun-Suk. "Fundamental Studies on Oxidation of Graphite for Polymer Electrolyte Fuel Cells." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/124501.
Full textMa, Yulin. "The Fundamental Studies of Polybenzimidazole/Phosphoric Acid Polymer Electrolyte for Fuel Cells." Case Western Reserve University School of Graduate Studies / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=case1089835902.
Full textMiyazaki, Kohei. "Studies on anode catalysts using gold nanoparticles for polymer electrolyte fuel cells." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/136301.
Full textKinumoto, Taro. "Fundamental studies on durability and performance improvement of polymer electrolyte fuel cells." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/144023.
Full text0048
新制・課程博士
博士(工学)
甲第12337号
工博第2666号
新制||工||1377(附属図書館)
24173
UT51-2006-J329
京都大学大学院工学研究科物質エネルギー化学専攻
(主査)教授 小久見 善八, 教授 江口 浩一, 教授 田中 功
学位規則第4条第1項該当
Takeuchi, Norimitsu. "Studies on Oxidative Degradation of Carbon Support of Electrocatalysts for Polymer Electrolyte Fuel Cells." Kyoto University, 2017. http://hdl.handle.net/2433/225965.
Full textFujiwara, Naoko. "Studies on Electrochemical Oxidation of Organic Compounds for Direct Polymer Electrolyte Fuel Cells." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/124566.
Full textFanapi, Nolubabalo Hopelorant. "Durability studies of membrane electrode assemblies for high temperature polymer electrolyte membrane fuel cells." University of the Western Cape, 2011. http://hdl.handle.net/11394/5416.
Full textPolymer electrolyte membrane fuel cells (PEMFCs) among other fuel cells are considered the best candidate for commercialization of portable and transportation applications because of their high energy conversion and low pollutant emission. Recently, there has been significant interest in high temperature polymer electrolyte membrane fuel cells (HT-PEMFCs), due to certain advantages such as simplified system and better tolerance to CO poisoning. Cost, durability and the reliability are delaying the commercialization of PEM fuel cell technology. Above all durability is the most critical issue and it influences the other two issues. The main objective of this work is to study the durability of membrane electrode assemblies (MEAs) for HT-PEMFC. In this study the investigation of commercial MEAs was done by evaluating their performance through polarization studies on a single cell, including using pure hydrogen and hydrogen containing various concentrations of CO as fuel, and to study the performance of the MEAs at various operating temperatures. The durability of the MEAs was evaluated by carrying out long term studies with a fixed load, temperature cycling and open circuit voltage degradation. Among the parameters studied, significant loss in the performance of the MEAs was noted during temperature cycling. The effect of temperature cycling on the performance of the cell showed that the performance decreases with increasing no. of cycles. This could be due to leaching of acid from the cell or loss of electrochemically active surface area caused by Pt particle size growth. For example at 160°C, a performance loss of 3.5% was obtained after the first cycle, but after the fourth cycle a huge loss of 80.8% was obtained. The in-house MEAs with Pt-based binary catalysts as anodes were studied for CO tolerance, performance and durability. A comparison of polarization curves between commercial and in-house MEAs illustrated that commercial MEA gave better performance, obtaining 0.52 A/cm² at 0.5V and temperature of 160°C, with in-house giving 0.39A/cm² using same parameters as commercial. The CO tolerance of both commercial and in-house MEA was found to be similar. In order to increase the CO tolerance of the in-house MEAs, Pt based binary catalysts were employed as anodesand the performance was investigated In-house MEAs with Pt/C and Pt-based binary catalysts were compared and a better performance was observed for Pt/C than Pt-alloy catalysts with Pt-Co/C showing comparable performance. At 0.5 V the performance obtained was 0.39 A/cm2 for Pt/C, and 0.34A/cm²,0.28A/cm²,0.27A/cm² and 0.16A/cm² were obtained for Pt-Co/C, Pt-Fe/C, Pt-Cu/C and Pt-Ni respectively. When the binary catalysts were tested for CO tolerance, Pt-Co showed no significant loss in performance when hydrogen containing CO was used as anode fuel. Scanning electron microscopy (SEM) revealed delamination between the electrodes and membrane of the tested and untested MEA's. Membrane thinning was noted and carbon corrosion was observed from the tested micro-porous layer between the gas diffusion layer (GDL) and catalyst layer (CL).
Aoki, Hiroyoshi. "Studies on Electronic and Local Structure of Pt based Cathode Catalysts for Polymer Electrolyte Fuel Cells." Kyoto University, 2011. http://hdl.handle.net/2433/142305.
Full text0048
新制・課程博士
博士(人間・環境学)
甲第16177号
人博第560号
新制||人||134(附属図書館)
22||人博||560(吉田南総合図書館)
28756
京都大学大学院人間・環境学研究科相関環境学専攻
(主査)教授 内本 喜晴, 教授 杉山 雅人, 教授 田部 勢津久, 准教授 福塚 友和
学位規則第4条第1項該当
Aaron, Douglas Scott. "Transport in fuel cells: electrochemical impedance spectroscopy and neutron imaging studies." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34699.
Full textAnderson, Jordan. "Electrochemical Studies of Nanoscale Composite Materials as Electrodes in Direct Alcohol Fuel Cells." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5104.
Full textPh.D.
Doctorate
Chemistry
Sciences
Chemistry
Treptow, Florian. "Polyaniline as electrolyte in polymer electrolyte membrane fuel cells." Thesis, Loughborough University, 2005. https://dspace.lboro.ac.uk/2134/11086.
Full textBuche, Silvain. "Polymer electrolyte fuel cell diagnostics." Thesis, University of Bath, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285318.
Full textFeser, Joseph P. "Convective flow through polymer electrolyte fuel cells." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 1.77 Mb., 93 p, 2005. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:1428199.
Full textWesselmark, Maria. "Electrochemical Reactions in Polymer Electrolyte Fuel Cells." Doctoral thesis, KTH, Tillämpad elektrokemi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-25267.
Full textPolymerelektrolytbränslecellen omvandlar den kemiska energin i ett bränsle, exv. vätgas eller metanol, och syrgas till elektrisk energi. Den höga verkningsgraden samt möjligheten att använda bränsle från förnyelsebara källor gör dem attraktiva som energiomvandlare i framtida hållbara energisystem. En enorm utveckling har skett under det senaste årtiondet men för att kunna introducera polymerelektrolytbränslecellen på marknaden i en större skala måste livstiden öka och kostnaden minska. Elektroderna har en central del i detta då den platina som används som katalysator står för en stor del av kostnaden för bränslecellen. En stor del av prestandaförsämringen med tiden hos bränslecellen kan också relateras till en degradering av den porösa elektroden och en minskad elektrokemiskt aktiv platinayta. I denna avhandling studeras olika bränslecellsreaktioner samt olika katalysatorer och supportmaterial med målet att undersöka möjligheten att förbättra platinakatalysatorns aktivitet, stabilitet och utnyttjandegrad i bränslecellselektroder. Utbytesströmtätheten, i0, för vätgasoxidationen i bränslecell bestämdes till 770 mA cm-2Pt genom försök med modellelektroderna. Denna var högre än vad som framkommit tidigare i litteratur, vilket visar att de kinetiska förlusterna på anoden är mycket små. Katalysatormängden på anoden borde därför kunna minskas utan några större potentialförluster så länge masstransporten av vätgas är tillräcklig. Den elektrokemiskt aktiva ytan, aktiviteten och stabiliteten hos elektroden visade sig kunna påverkas av supportmaterialet. Platina deponerad på volfram oxid hade en högre aktivitet vid höga potentialer vilket relaterades till den förskjutna oxidbildningen på ytan. Elektroder med platina på volframoxid och iridiumoxid var mer stabila än elektroder med platina på kol. Det var även platina på ett icke grafitiserat kol med låg yta jämfört med platina på grafitiserade kol med en hög yta. Platina på metalloxidskikt av volfram och titan visade en högre elektrokemiskt aktiv yta i de cykliska voltamogrammen än platina på kol, vilket förklarades med att båda metalloxiderna har en bra protonledningsförmåga. CO-stripping gav det säkraste måttet på den elektrokemiskt aktiva ytan i en elektrod i bränslecell. CO-stripping visade sig även vara användbart för karaktärisering av degraderingen av en elektrod. Oxidationen av små organiska föreningar påverkades av borttransporten av intermediärer samt av kloridföroreningar. Pt aoch PtRu påverkades olika vilket gjorde det möjligt att få fram information om reaktionsmekanismer och hastighetsbestämmande steg.
QC 20101014
Matian, Mardit. "Heat transfer in polymer electrolyte fuel cells." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6215.
Full textFedock, John Andrew. "Low temperature polymer electrolyte fuel cell performance degradation." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002565.
Full textTingelöf, Thomas. "Polymer Electrolyte Fuel Cells in Reformate Power Generators." Doctoral thesis, KTH, Skolan för kemivetenskap (CHE), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26938.
Full textQC 20101130
Verma, Atul. "Transients in Polymer Electrolyte Membrane (PEM) Fuel Cells." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/64247.
Full textPh. D.
Chivengwa, Tapiwa. "Microchannel flow fields for polymer electrolyte fuel cells." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/13674.
Full textDe, Beer Chris. "Condition monitoring of polymer electrolyte membrane fuel cells." Doctoral thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13264.
Full textAs the global demand for energy continues to grow new technologies and systems must be developed to supply the market. This includes renewable energy generation, storage and conversion systems. The primary storage technology in use today in the portable electronics, the automotive sector and to a lesser extent power networks is battery based systems. To overcome some of the limitations inherent in batteries, fuel cell based power generators and converters have been developed. Fuel cells act as electrochemical energy converters that convert a fuel source such as natural gas directly into electrical power without any secondary phases. For systems running on Hydrogen generated via renewable or natural sources, the input/output cycle becomes completely sustainable. Out of the different fuel cell types available and under development, the Proton Exchange Membrane or Polymer Electrolyte Membrane (PEM) fuel cell has emerged as the technology of choice, and currently owns more than 80% of the commercial fuel cell market. This has spurred further research in the field to increase performance and life expectancy of the cell materials. A promising development in the form of High Temperature PEM (HT-PEM) fuel cells has recently emerged and addresses some of the shortcomings of the low temperature counterparts. A critical field of research is the condition monitoring strategies and technologies for the electrochemical device that ties in with the power conditioning sub-systems. This thesis presents the development of condition monitoring systems by conducting detailed studies on the fault/degradation mechanisms prevalent in the cell materials for the purpose of detection, classification and implementation of possible mitigation strategies. Specific consideration is given to the detailed analysis of the fault mechanisms in HT-PEM fuel cells that are not yet fully understood and commercialized. In particular, electrochemical equivalent circuit models and reduced order semi- empirical models are developed to facilitate fault detection. Based on these models, mitigation strategies for specific faults are proposed and experimentally verified. New systems and methods are developed for rapid online impedance signature mapping that provide a basis for early fault prediction that can increase system performance and life expectancy. The findings in this research provide valuable insight into the effect that most prevalent faults have on the internal electrochemistry and the impact on electrical performance. From the experimental results, a semi-empirical electrochemical model is developed to assist with life time estimation and system optimization. The model is integrated with a real time emulator platform that can reproduce single cell voltage levels at the high output currents and transient characteristics. A detailed analysis is conducted on CO poisoning and the resulting effects on key equivalent circuit parameters that enable quantification of the fault condition. It is shown that the catalyst at the higher operating temperature is still susceptible to a certain degree of semi-permanent degradation. To mitigate these effects, a new active current control strategy is proposed to enforce electro-oxidation of the CO to recover the lost active area that delivered superior results compared to current pulsing strategies. New rapid online detection strategies are proposed by using small voltage transients in an operational HT-PEM fuel cell. The method makes use of the discrete S-transform that overcomes some of the limits in other signal processing methods used in fuel cell diagnostics. To enable detailed parameter calculation, a population based incremental learning algorithm is implemented in the developed method. A new condition monitoring system is developed that makes use of Optimized Broadband Impedance Spectroscopy. The hardware is designed to accommodate both single cell and stack level implementation. It is shown that the proposed system is able to deliver measurements under extreme non-linear conditions that can occur in PEM fuel cells in a fraction of the time associated with normal EIS based systems.
Branco, Carolina Musse. "Multilayer membranes for intermediate temperature polymer electrolyte fuel cells." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7717/.
Full textTumuluri, Uma. "Nonlinear State Estimation in Polymer Electrolyte Membrane Fuel Cells." Cleveland State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=csu1231961499.
Full textBalogun, Emmanuel O. "Comparative analysis of Polymer Electrolyte Membrane (PEM) fuel cells." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29764.
Full textMamlouk, Mohamed. "Investigation of high temperature polymer electrolyte membrane fuel cells." Thesis, University of Newcastle upon Tyne, 2008. http://hdl.handle.net/10443/3973.
Full textPehlivan-Davis, Sebnem. "Polymer Electrolyte Membrane (PEM) fuel cell seals durability." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/21749.
Full textBrunello, Giuseppe. "Computational modeling of materials in polymer electrolyte membrane fuel cells." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/48937.
Full textPilditch, Stephen Robert. "Modelling high temperature phosphoric acid doped polymer electrolyte fuel cells." Thesis, University of Newcastle Upon Tyne, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519580.
Full textEl-Kharouf, Ahmad. "Understanding GDL properties and performance in polymer electrolyte fuel cells." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5211/.
Full textEpting, William K. "Characterizing Electrode-Level Oxygen Transport in Polymer Electrolyte Fuel Cells." Research Showcase @ CMU, 2015. http://repository.cmu.edu/dissertations/623.
Full textZhu, Huizhen. "Applications of polyamidoamine dendrimers in polymer electrolyte membrane fuel cells." Thesis, [Tuscaloosa, Ala. : University of Alabama Libraries], 2009. http://purl.lib.ua.edu/2188.
Full textAlcock, Hannah Jane. "High throughput studies of polymer electrolytes for battery and fuel cell applications." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/79788/.
Full textLeahy, Scott B. "Active Flow Control of Lab-Scale Solid Polymer Electrolyte Fuel Cells." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5188.
Full textThompson, Scott Damon 1976. "Electrodeposition of platinum-based catalysts for polymer electrolyte membrane fuel cells." Monash University, School of Physics and Materials Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/5668.
Full textYau, Tak Cheung. "A study of water crossover in polymer electrolyte membrane fuel cells." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/30755.
Full textRama, Pratap. "On the mechanisms of electrochemical transport in Polymer Electrolyte Fuel Cells." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/5978.
Full textSombatmankhong, 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.
Full textCruz-Manzo, Samuel. "Electrochemical mechanisms of the impedance spectrum in polymer electrolyte fuel cells." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12316.
Full textMansor, N. B. "Development of catalysts and catalyst supports for polymer electrolyte fuel cells." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1460064/.
Full textWorsdale, Matthew Clive. "Ab-initio investigation into catalyst supports for polymer electrolyte fuel cells." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/413850/.
Full textBenson, Paul Alan. "Analysis of low-pressure evaporatively cooled polymer electrolyte membrane fuel cells." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/34098.
Full textCai, Bin, Sebastian Henning, Juan Herranz, Thomas J. Schmidt, and Alexander Eychmüller. "Nanostructuring noble metals as unsupported electrocatalysts for polymer electrolyte fuel cells." Wiley-VCH, 2018. https://tud.qucosa.de/id/qucosa%3A31155.
Full textKienitz, Brian L. "The Effects of Cationic Contamination on Polymer Electrolyte Membrane Fuel Cells." Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1228255795.
Full textKamarajugadda, Sai K. "Advanced Models for Predicting Performance of Polymer Electrolyte Membrane Fuel Cells." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1323758118.
Full textGao, Xiao. "Elucidation of Ionomer/Electrode Interfacial Phenomena in Polymer Electrolyte Fuel Cells." Kyoto University, 2020. http://hdl.handle.net/2433/254528.
Full text0048
新制・課程博士
博士(人間・環境学)
甲第22708号
人博第958号
新制||人||227(附属図書館)
2020||人博||958(吉田南総合図書館)
京都大学大学院人間・環境学研究科相関環境学専攻
(主査)教授 内本 喜晴, 教授 高木 紀明, 教授 中村 敏浩
学位規則第4条第1項該当
Davies, Damian Patrick. "Development and optimisation of solid polymer electrolyte fuel cell systems." Thesis, De Montfort University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391234.
Full textJennings, Paul Christopher. "Computational studies of mono- and bimetallic nanoclusters for potential polymer electrolyte fuel cell applications." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5324/.
Full textJalani, Nikhil H. "Development of nanocomposite polymer electrolyte membranes for higher temperature PEM fuel cells." Link to electronic dissertation, 2006. https://www.wpi.edu/ETD-db/ETD-catalog/view%5Fetd?URN=etd-032706-165027.
Full textMarshall, Josiah. "Synthesis of the Diazonium Zwitterionic Polymer/Monomer for Use as the Electrolyte in Polymer Electrolyte Membrane (PEM) Fuel Cells." Digital Commons @ East Tennessee State University, 2021. https://dc.etsu.edu/etd/3968.
Full text