Investigation of Surface Properties and Heterogeneity in Gas Diffusion Layers for Polymer Electrolyte Membrane Fuel Cells PDF Download
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Author: J. Zachary Fishman
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: J. Zachary Fishman
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Michael Gerald George
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Characterization of gas diffusion layers (GDLs) for polymer electrolyte membrane (PEM) fuel cells informs modeling studies and the manufacturers of next generation fuel cell materials. Identifying the physical properties related to the primary functions of the modern GDL (thermal, electrical, and mass transport) is necessary for understanding the impact of GDL design choices. X-ray micro-computed tomographic reconstructions of GDLs were studied to isolate GDL surface morphologies. Surface roughness was measured for a wide variety of samples and a sensitivity study highlighted the scale-dependence of surface roughness measurements. Furthermore, a spatially resolved distribution map of polytetrafluoroethylene (PTFE) in the microporous layer (MPL), critical for water management and mass transport, was identified and the existence of PTFE agglomerations was highlighted. Finally, the impact of accelerated degradation on GDL wettability and water transport increases in liquid water accumulation and oxygen mass transport resistance were quantified as a result of accelerated GDL degradation.
Author: Xianguo Li
Publisher: CRC Press
ISBN: 113520179X
Category : Science
Languages : en
Pages : 465
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Book Description
The book is engineering oriented and covers a large variety of topics ranging from fundamental principles to performance evaluation and applications. It is written systematically and completely on the subject with a summary of state-of-the-art fuel cell technology, filling the need for a timely resource. This is a unique book serving academic researchers, engineers, as well as people working in the fuel cell industry. It is also of substantial interest to students, engineers, and scientists in mechanical engineering, chemistry and chemical engineering, electrochemistry, materials science and engineering, power generation and propulsion systems, and automobile engineering.
Author: Ahmet Evren Firat
Publisher: Cuvillier Verlag
ISBN: 3736992572
Category : Mathematics
Languages : en
Pages : 131
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Book Description
Polymer electrolyte membrane (PEM) fuel cell stack was analyzed from a mechanical point of view with the help of measurements and simulations in this study. The deflection of the fuel cell stack was measured with the help of the experimental set-up under operating conditions. The effects of cell operating parameters and cyclic conditions on the mechanical properties of the fuel cell stack were investigated. In order to extend the mechanical analysis of the fuel cells, two computational models were established containing the geometrical features in detail. A large-scale fuel cell stack model was built for the thermomechanical analysis. The second model was built on a cross-section geometry for the electrochemical analysis including fluid dynamics. The internal stress distribution and buckling of fuel cell stack were examined. The influence of the mechanical compression on the cell performance and squeezing of the gas diffusion layers are investigated. A design procedure is developed for fuel cell stack regarding the durability and performance from a mechanical point of view.
Author: David P. Wilkinson
Publisher: CRC Press
ISBN: 1439806667
Category : Science
Languages : en
Pages : 462
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Book Description
A Detailed, Up-to-Date Treatment of Key Developments in PEMFC MaterialsThe potential to revolutionize the way we power our worldBecause of its lower temperature and special polymer electrolyte membrane, the proton exchange membrane fuel cell (PEMFC) is well-suited for transportation, portable, and micro fuel cell applications. But the performance o
Author: Jessica Yablecki
Publisher:
ISBN: 9780494929773
Category :
Languages : en
Pages :
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Author: Matthew M. Mench
Publisher: Academic Press
ISBN: 0123869560
Category : Technology & Engineering
Languages : en
Pages : 473
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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. Designed to be relevant to the professional community in addition to researchers, this book will serve as a valuable reference featuring topics covered nowhere else and a one-stop-shop to create a solid platform for understanding this important area of development. The reference covers aspects of durability in the entire fuel cell stack. Each chapter also includes vision of pathways forward and an explanation of the tools needed to continue along the path toward commercialization. - Features expert insights from contributing authors who are key industrial and academic leaders in the field - Includes coverage of two key topics in the field- Testing and Protocol for Durability, and Computational Modeling Aspects of PEFC Durability- which are newly emerging, pivotally important subjects not systematically covered anywhere else - Undertakes aspects of durability across the entire fuel stack, from membranes to bipolar plates
Author: Manojkumar Balakrishnan
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The polymer electrolyte membrane (PEM) fuel cell is a versatile alternative for the decarbonization of the transportation sector. However, high cost and limited durability of materials hinder widespread adoption. This thesis comprises two studies that aim to address both cost and durability of PEM fuel cells via the design of tailored gas diffusion layers (GDLs). First, electrospinning is presented as a platform to fabricate and design tailored GDLs with pore size gradients for the improved high current performance of PEM fuel cells. Specifically, the novel graded GDL was found to reduce ohmic resistance and improve mass transport performance. Next, the durability of electrospun GDLs was investigated via an ex situ accelerated degradation procedure. The degraded GDLs exhibited reduced hydrophobicity due to loss of surface groups and reduced electrical conductivity due to carbon degradation. This thesis offers insight into designing next generation, durable GDLs with tailored structures for PEM fuel cells.
Author: Jiujun Zhang
Publisher: Springer Science & Business Media
ISBN: 1848009364
Category : Technology & Engineering
Languages : en
Pages : 1147
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Book Description
Proton exchange membrane (PEM) fuel cells are promising clean energy converting devices with high efficiency and low to zero emissions. Such power sources can be used in transportation, stationary, portable and micro power applications. The key components of these fuel cells are catalysts and catalyst layers. “PEM Fuel Cell Electrocatalysts and Catalyst Layers” provides a comprehensive, in-depth survey of the field, presented by internationally renowned fuel cell scientists. The opening chapters introduce the fundamentals of electrochemical theory and fuel cell catalysis. Later chapters investigate the synthesis, characterization, and activity validation of PEM fuel cell catalysts. Further chapters describe in detail the integration of the electrocatalyst/catalyst layers into the fuel cell, and their performance validation. Researchers and engineers in the fuel cell industry will find this book a valuable resource, as will students of electrochemical engineering and catalyst synthesis.
Author: Cody D. Rath
Publisher:
ISBN:
Category : Fluid-structure interaction
Languages : en
Pages : 146
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Book Description
"Over the past few decades, polymer electrolyte membrane (PEM) fuel cells have been gaining increased attention as a possible replacement for the internal combustion engine. Fuel cell vehicles are an attractive alternative because of the fact that they can operate without the use of fossil fuels, are more efficient than internal combustion vehicles, and have no harmful emissions with the only byproducts being heat and pure water. Managing this water has been shown to be a key area of research. In order for fuel cells to operate properly, there must be a certain level of hydration present in the membrane; however, too much water can cause the cell to flood, which reduces access of reactants to the reaction sites and consequently the amount of electrochemical reactions. These effects cause a decrease in the overall efficiency and performance of the cell. One specific area of interest that has gained attention recently is the buildup of water in the reactant gas channels. Several works have focused on droplet channel interactions, however many only investigate the droplet growth process, or just the interaction between the droplet and the air cross flow. Few works have investigated the interaction between the growing droplet when it is exposed to a base and channel side which typically have differing surface energies. This issue is addressed in this work at a fundamental level by investigating droplet formation and accumulation in a corner. The work presented here utilizes an ex situ experimental approach that visualizes the dynamics of a water droplet as it emerges from a fibrous material and interacts with a solid side wall surface. A test section is designed and used to characterize the movement of the droplet interfaces as a function of geometry, surface energy, i.e. contact angle, and surface roughness. The governing principle behind the design of this setup is the Concus - Finn Condition and it is proposed here that this condition can be used as a tool for designing channels with improved water management. It has been determined that the local contact angle is a critical parameter when analyzing the behavior of a growing droplet on the surface of a fibrous material as it interacts with the channel side wall. Also, local contact angle values were found to exceed the previously measured contact angles for the surfaces due to the severely strained interface of the droplet over the porous structure. The Concus-Finn condition can be successfully used to determine the behavior of a droplet in a corner based on the local contact angle. A force balance analysis is used to support this finding and to determine the driving forces that cause the droplet behavior."--Abstract.
