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Polymer Electrolyte Fuel Cell Degradation

Polymer Electrolyte Fuel Cell Degradation Book
Author : Matthew M. Mench,Emin Caglan Kumbur,T. Nejat Veziroglu
Publisher : Academic Press
Release : 2011
ISBN : 0123869366
Language : En, Es, Fr & De

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Book Description :

For full market implementation of PEM fuel cells to become a reality, two main limiting technical issues must be overcome- cost and durability. This cutting-edge volume directly addresses the state-of-the-art advances in durability within every fuel cell stack component. [...] chapters on durability in the individual fuel cell components -- membranes, electrodes, diffusion media, and bipolar plates -- highlight specific degradation modes and mitigation strategies. The book also includes chapters which synthesize the component-related failure modes to examine experimental diagnostics, computational modeling, and laboratory protocol"--Back cover.

Polymer Electrolyte Fuel Cells

Polymer Electrolyte Fuel Cells Book
Author : Alejandro A. Franco
Publisher : CRC Press
Release : 2016-04-19
ISBN : 9814364401
Language : En, Es, Fr & De

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Book Description :

This book focuses on the recent research progress on the fundamental understanding of the materials degradation phenomena in PEFC, for automotive applications. On a multidisciplinary basis, through contributions of internationally recognized researchers in the field, this book provides a complete critical review on crucial scientific topics related to PEFC materials degradation, and ensures a strong balance between experimental and theoretical analysis and preparation techniques with several practical applications for both the research and the industrial communities.

Polymer Electrolyte Fuel Cell Durability

Polymer Electrolyte Fuel Cell Durability Book
Author : Felix N. Büchi,Minoru Inaba,Thomas J. Schmidt
Publisher : Springer Science & Business Media
Release : 2009-02-08
ISBN : 038785536X
Language : En, Es, Fr & De

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Book Description :

This book covers a significant number of R&D projects, performed mostly after 2000, devoted to the understanding and prevention of performance degradation processes in polymer electrolyte fuel cells (PEFCs). The extent and severity of performance degradation processes in PEFCs were recognized rather gradually. Indeed, the recognition overlapped with a significant number of industrial dem- strations of fuel cell powered vehicles, which would suggest a degree of technology maturity beyond the resaolution of fundamental failure mechanisms. An intriguing question, therefore, is why has there been this apparent delay in addressing fun- mental performance stability requirements. The apparent answer is that testing of the power system under fully realistic operation conditions was one prerequisite for revealing the nature and extent of some key modes of PEFC stack failure. Such modes of failure were not exposed to a similar degree, or not at all, in earlier tests of PEFC stacks which were not performed under fully relevant conditions, parti- larly such tests which did not include multiple on–off and/or high power–low power cycles typical for transportation and mobile power applications of PEFCs. Long-term testing of PEFCs reported in the early 1990s by both Los Alamos National Laboratory and Ballard Power was performed under conditions of c- stant cell voltage, typically near the maximum power point of the PEFC.

Proton Exchange Membrane Fuel Cells 9

Proton Exchange Membrane Fuel Cells 9 Book
Author : T. Fuller,C. Hartnig,V. Ramani,H. Uchida,H. A. Gasteiger,S. Cleghorn,P. Strasser,T. Zawodzinski,D. Jones,P. Shirvanian,T. Jarvi,P. Zelenay,C. Lamy,P. Bele
Publisher : The Electrochemical Society
Release : 2009-09
ISBN : 1566777380
Language : En, Es, Fr & De

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Book Description :

This issue of ECS Transactions is devoted to all aspects of research, development, and engineering of proton exchange membrane (PEM) fuel cells and attacks, as well as low-temperature direct-fuel cells. The intention of the symposium is to bring together the international community working on the subject and to enable effective interactions between the research and engineering communities. This issue is sold as a two-part set.

Modeling and Diagnostics of Polymer Electrolyte Fuel Cells

Modeling and Diagnostics of Polymer Electrolyte Fuel Cells Book
Author : Ugur Pasaogullari,Chao-Yang Wang
Publisher : Springer Science & Business Media
Release : 2010-07-23
ISBN : 9780387980683
Language : En, Es, Fr & De

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Book Description :

This volume, presented by leading experts in the field, covers the latest advances in diagnostics and modeling of polymer electrolyte fuel cells, from understanding catalyst layer durability to start-up under freezing conditions.

Dynamic Modelling of Platinum Degradation in Polymer Electrolyte Fuel Cells

Dynamic Modelling of Platinum Degradation in Polymer Electrolyte Fuel Cells Book
Author : Heather Baroody
Publisher :
Release : 2018
ISBN :
Language : En, Es, Fr & De

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Book Description :

Platinum stability in the catalyst layer is vital to the lifetime of polymer electrolyte fuel cells. This thesis uses physical-mathematical modelling to provide a deeper under- standing of platinum degradation. Dissolution, a dominant degradation mechanism under fuel cell operating conditions, is shown to be strongly linked to oxide formation, growth, and reduction. However, since a consistent model that explains this link does not exist, the goal is to understand the platinum oxide processes and relate these to platinum degradation. In the first part, a physical-statistical model of Pt degradation is presented that encompasses the main particle-level degradation pathways namely dissolution, rede- position, coagulation, and detachment. A systematic algorithm is developed to pro- cess experimental inputs and generate outputs on kinetic rate parameters. Once the complete parameter space is explored using Monte Carlo techniques, an optimization routine is run to refine the results. In this way, unique, unambiguous rate parameters pertinent to different degradation mechanisms under various operating protocols have been extracted. It is shown that dissolution/redeposition increase with increasing up- per potential cycling limit; particle detachment increases with increasing surface area of the carbon support, whereas dissolution is independent of the carbon support type. Then a platinum oxide growth and reduction model is developed that implements in- terfacial exchange processes between platinum and oxygen atoms, as well as transport mechanism of oxygen vacancies through diffusion and field migration. A quasi-steady state model of oxide formation, growth, and reduction is developed. Oxide growth is seen to be sensitive to oxygen ion vacancy at the metal-oxide interface and the rate of platinum ion extraction across the interface. The tools this thesis presents provide better understanding to the underlying relations of platinum degradation that can be used to enhance the lifetime of fuel cells. For example, reliable assessments of the prominent degradation mechanism under various operating conditions can be evaluated to set priorities for materials research.

Proton Exchange Membrane Fuel Cells 6

Proton Exchange Membrane Fuel Cells 6 Book
Author : Thomas Francis Fuller
Publisher : The Electrochemical Society
Release : 2006-01-01
ISBN : 1566775019
Language : En, Es, Fr & De

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Book Description :

The symposium was devoted to all aspects of research development and engineering of proton exchange membrane fuel cells. Three subareas were covered: materials and electrode processes, fuel cell systems, and durability.

Polymer Electrolyte Fuel Cells and Electrolyzers 18 PEFC E 18

Polymer Electrolyte Fuel Cells and Electrolyzers 18  PEFC E 18  Book
Author : D. J. Jones,H. Gasteiger,H. Uchida,T. J. Schmidt,F. Buechi,K. E. Swider-Lyons,B. S. Pivovar,P. N. Pintauro,V. K. Ramani,J. M. Fenton,P. Strasser,K. E. Ayers,A. Z. Weber,T. F. Fuller,R. A. Mantz,H. Xu,C. Coutanceau,S. Mitsushima,S. Narayan,P. Shirvanian,Y.-T. Kim,Y. Gochi-Ponce
Publisher : The Electrochemical Society
Release : 2018-09-21
ISBN : 1607688603
Language : En, Es, Fr & De

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Book Description :

Polymer Electrolyte Membrane and Direct Methanol Fuel Cell Technology

Polymer Electrolyte Membrane and Direct Methanol Fuel Cell Technology Book
Author : Christoph Hartnig,Christina Roth
Publisher : Elsevier
Release : 2012-03-19
ISBN : 0857095471
Language : En, Es, Fr & De

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Book Description :

Polymer electrolyte membrane fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs) technology are promising forms of low-temperature electrochemical power conversion technologies that operate on hydrogen and methanol respectively. Featuring high electrical efficiency and low operational emissions, they have attracted intense worldwide commercialization research and development efforts. These R&D efforts include a major drive towards improving materials performance, fuel cell operation and durability. In situ characterization is essential to improving performance and extending operational lifetime through providing information necessary to understand how fuel cell materials perform under operational loads. This two volume set reviews the fundamentals, performance, and in situ characterization of PEMFCs and DMFCs. Volume 1 covers the fundamental science and engineering of these low temperature fuel cells, focusing on understanding and improving performance and operation. Part one reviews systems fundamentals, ranging from fuels and fuel processing, to the development of membrane and catalyst materials and technology, and gas diffusion media and flowfields, as well as life cycle aspects and modelling approaches. Part two details performance issues relevant to fuel cell operation and durability, such as catalyst ageing, materials degradation and durability testing, and goes on to review advanced transport simulation approaches, degradation modelling and experimental monitoring techniques. With its international team of expert contributors, Polymer electrolyte membrane and direct methanol fuel cell technology Volumes 1 & 2 is an invaluable reference for low temperature fuel cell designers and manufacturers, as well as materials science and electrochemistry researchers and academics. Covers the fundamental science and engineering of polymer electrolyte membrane fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs), focusing on understanding and improving performance and operation Reviews systems fundamentals, ranging from fuels and fuel processing, to the development of membrane and catalyst materials and technology, and gas diffusion media and flowfields, as well as life cycle aspects and modelling approaches Details performance issues relevant to fuel cell operation and durability, such as catalyst ageing, materials degradation and durability testing, and reviews advanced transport simulation approaches, degradation modelling and experimental monitoring techniques

High Temperature Polymer Electrolyte Membrane Fuel Cells

High Temperature Polymer Electrolyte Membrane Fuel Cells Book
Author : Qingfeng Li,David Aili,Hans Aage Hjuler,Jens Oluf Jensen
Publisher : Springer
Release : 2015-10-15
ISBN : 3319170821
Language : En, Es, Fr & De

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Book Description :

This book is a comprehensive review of high-temperature polymer electrolyte membrane fuel cells (PEMFCs). PEMFCs are the preferred fuel cells for a variety of applications such as automobiles, cogeneration of heat and power units, emergency power and portable electronics. The first 5 chapters of the book describe rationalization and illustration of approaches to high temperature PEM systems. Chapters 6 - 13 are devoted to fabrication, optimization and characterization of phosphoric acid-doped polybenzimidazole membranes, the very first electrolyte system that has demonstrated the concept of and motivated extensive research activity in the field. The last 11 chapters summarize the state-of-the-art of technological development of high temperature-PEMFCs based on acid doped PBI membranes including catalysts, electrodes, MEAs, bipolar plates, modelling, stacking, diagnostics and applications.

Investigating Cathode Catalyst Layer Degradation in Polymer Electrolyte Fuel Cells by Lab based X ray Computed Tomography

Investigating Cathode Catalyst Layer Degradation in Polymer Electrolyte Fuel Cells by Lab based X ray Computed Tomography Book
Author : Robin White
Publisher :
Release : 2019
ISBN :
Language : En, Es, Fr & De

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Book Description :

The commercial viability of polymer electrolyte fuel cells (PEFCs) has increased rapidly over recent years with applications in public and commercial transportation, back-up power, and un-manned autonomous systems. This has come as a direct result toward increasing evidence and severity of climate change due to greenhouse gas emissions; pushing the need for government regulations to introduce stricter limits on fossil fuel combustion in new passenger cars, as well as in other light-to heavy-duty vehicles. Further cost and durability improvements in PEFCs present significant opportunities as the technology continues to be refined. PEFCs are assembled as a series of layers, each having specific functionalities to optimize the cell performance during electrochemical conversion of chemical potential energy, in the way of hydrogen and oxygen, into useable electrical power, heat, and water. These PEFC materials can undergo considerable changes during operation, and lifetime testing through critical degradation processes, which can be uniquely captured using X-ray Computed Tomography (XCT) in this complex multi-layered system. XCT provides a unique ability to delve into the innermost structures through non-destructive imaging in diverse and extensive application areas. In this thesis, a novel small-scale fuel cell fixture that mimics the performance and degradation features of a full-scale PEFC assembly is presented. By combining the 3-dimensional visualization through repeated identical location tomography using XCT scans at various temporal stages of this small-scale fixture, powerful in-situ and operando investigations of dynamic material properties are obtained. This methodology is termed as 4D CT. By means of applying accelerated stress tests focused on cathode catalyst layer degradation, unique insight into the lifetime, dynamics and interactions between the catalyst layer and surrounding components was uniquely obtained using custom developed tools and analysis methods. These new methods allow for new investigations into the temporal changes of water saturation and cathode catalyst layer morphology. It has been found that during ageing, the morphological interaction between different layers can have a considerable impact on degradation mechanisms such as crack propagation. These results uncover unique evidence around the strongly interactive nature of material degradation within a fuel cell that has previously been unobserved.

Proton Exchange Membrane Fuel Cell

Proton Exchange Membrane Fuel Cell Book
Author : Tolga Taner
Publisher : BoD – Books on Demand
Release : 2018-05-09
ISBN : 1789230667
Language : En, Es, Fr & De

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Book Description :

The main idea of this study is to scrutinize the performance efficiency and enhancement of modelling and simulations of PEM fuel cell. Besides, the research of PEM fuel cell performance can figure out many critical issues for an alternative resource energy. The chapters collected in the book are contributions by invited researchers with a long-standing experience in different research areas. I hope that the material presented here is understandable to a wide audience, not only energy engineers but also scientists from various disciplines. The book contains nine chapters in three sections: (1) "General Information About PEM Fuel Cell", (2) "PEM Fuel Cell Technology" and (3) "Many Different Applications of PEM Fuel Cell". This book presents detailed and up-to-date evaluations in different areas and was written by academics with experience in their field. It is anticipated that this book will make a scientific contribution to PEM fuel cell and other alternative energy resource workers, researchers, academics, PhD students and other scientists both in the present and in the future.

Fuel Cell Seminar 2007

Fuel Cell Seminar 2007 Book
Author : M. C. Williams
Publisher : The Electrochemical Society
Release : 2008-01-01
ISBN : 1566776392
Language : En, Es, Fr & De

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Book Description :

There are many fuel cell technologies, entities, commercialization plans, and research and development activities at various states of maturity. The fuel cell efforts encompassed in this issue represents a major, international research and development and demonstration activity. Fuel cells are a topic of great interest and shall probably remain so for some time. The Fuel Cell Seminar and Exposition remains a major social, technical, and marketing forum for fuel cells. The Electrochemical Society, through its collaboration with the Seminar, is able to bring this issue of ECS Transactions, containing important contributions, to a broad technical audience.