Characterization of Transport Phenomena in Polymer Electrolyte Systems PDF Download
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Author: Hooman Hafezi
Publisher:
ISBN:
Category :
Languages : en
Pages : 522
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Book Description
Author: Hooman Hafezi
Publisher:
ISBN:
Category :
Languages : en
Pages : 522
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Book Description
Author: Eric Wargo
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 322
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Book Description
The polymer electrolyte fuel cell (PEFC) is an electrochemical device which holds great promise as an alternative power source for use in a wide range of applications. However, improvements in cell performance are necessary for the commercialization of PEFCs. Recently, significant research effort has been placed on understanding the influence of the internal structure (i.e., microstructure) of fuel cell materials on the transport of water and reactant gases in PEFC systems. One component of interest is the porous diffusion media (DM), which has been shown to be vital for achieving necessary water management to maintain efficient fuel cell operation. However, current modeling efforts rely primarily on bulk correlations or idealized/randomly selected structures for these porous materials, which may misrepresent the true morphology of the DM and potentially fail to accurately capture the related effects on transport within this component. The objective of this dissertation work is to establish a framework which combines recent advances in 3-D microstructure quantification and pore-scale analysis to evaluate the structure and related transport characteristics of fuel cell DM. The presented framework includes the following features: i) the microstructures of the materials of interest are quantified rigorously in 3-D; ii) small representative volume elements (RVEs) are selected which capture the important features of the measured microstructure datasets to within high accuracy, for reliable and computationally efficient modeling of transport behavior; and iii) a suite of microstructure analysis tools is developed to determine several difficult-to-measure key structure-related transport properties. Using this approach, an in-depth understanding of the structure-related transport characteristics of a fuel cell DM sample is achieved.
Author: Tan Winie
Publisher: John Wiley & Sons
ISBN: 3527342001
Category : Science
Languages : en
Pages : 416
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Book Description
A comprehensive overview of the main characterization techniques of polymer electrolytes and their applications in electrochemical devices Polymer Electrolytes is a comprehensive and up-to-date guide to the characterization and applications of polymer electrolytes. The authors ? noted experts on the topic ? discuss the various characterization methods, including impedance spectroscopy and thermal characterization. The authors also provide information on the myriad applications of polymer electrolytes in electrochemical devices, lithium ion batteries, supercapacitors, solar cells and electrochromic windows. Over the past three decades, researchers have been developing new polymer electrolytes and assessed their application potential in electrochemical and electrical power generation, storage, and conversion systems. As a result, many new polymer electrolytes have been found, characterized, and applied in electrochemical and electrical devices. This important book: -Reviews polymer electrolytes, a key component in electrochemical power sources, and thus benefits scientists in both academia and industry -Provides an interdisciplinary resource spanning electrochemistry, physical chemistry, and energy applications -Contains detailed and comprehensive information on characterization and applications of polymer electrolytes Written for materials scientists, physical chemists, solid state chemists, electrochemists, and chemists in industry professions, Polymer Electrolytes is an essential resource that explores the key characterization techniques of polymer electrolytes and reveals how they are applied in electrochemical devices.
Author: Jude Olaoluwa Majasan
Publisher:
ISBN:
Category :
Languages : en
Pages : 199
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Book Description
Polymer Electrolyte Membrane Water Electrolysers (PEMWEs) are considered a promising candidate for large-scale renewable energy storage and green hydrogen production. To improve efficiency and minimize cost for large-scale deployment, operation at high current densities is necessary. However, a consequence of high current density operation is increased mass transport hindrance which degrades performance. Two components are critical to mass transport in PEMWEs, namely the porous transport layer (PTL) and the flow-field plates. Both are expected to transport liquid water, product gases, electrons, and heat with minimal fluidic, thermal and voltage losses. However, the influence of morphology and configuration of both these components and operating conditions on cell performance are not well understood. This research investigates the mass transport phenomena in the PTL and in the flow-field channels in relation to performance in PEMWEs. The influence of flow-field configuration and two-phase flow characteristics in the flow channels on performance was studied by combined high-speed optical imaging and electrochemical characterization at various operating conditions. Results showed a strong correlation of performance with the flow path length and flow regime. Further, a correlative ex-situ X-ray tomography and in-situ electrochemical characterization approach was used to investigate the influence of PTL microstructural parameters such as mean pore diameter, pore size distribution, porosity, tortuosity, and porosity distribution on performance. Results indicated that minimizing contact resistance is most beneficial for improved performance over the range of current density studied. The influence of flow channel depth on performance was investigated by electrochemical impedance spectroscopy and a design of experiment (DoE) approach was employed to investigate the relative importance and interaction effects of mass transport factors on cell performance. Results showed the water feed rate and two-way interaction between the flow-field and PTL are most significant. This study provides enhanced understanding of the mass transport characteristics in PEMWEs for optimized design and improved performance.
Author: Anji Reddy Polu
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659196690
Category :
Languages : en
Pages : 220
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Book Description
Ion conducting polymer electrolytes in thin flexible forms show great technological potentials to fabricate all-solid-state mini/micro electrochemical power sources viz. batteries, fuel cells, supercapacitors etc. This book contains the synthesis and characterization of solid polymer electrolytes, is mainly focused on the objectives: to develop some new Mg2+ ion conducting solid polymer and composite polymer electrolytes using a novel solution casting technique; to characterize these materials using various models and experimental techniques; to understand the ion transport properties; subsequently, to employ these solid polymer electrolytes in the fabrication of solid state batteries and study the cell performances under constant load. This book is also provide the basic ideas of ion conduction mechanism in polymer electrolytes and also explained various models for transport phenomenon.
Author: Jeffrey Anders Fimrite
Publisher:
ISBN:
Category : Fuel cells
Languages : en
Pages : 0
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Book Description
Author: Vijaya Kumar Kambila
Publisher: LAP Lambert Academic Publishing
ISBN: 9783844326680
Category :
Languages : en
Pages : 440
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Book Description
The Research and Development of Solid Conducting Polymer Electrolytes has become has always an identifiable.The Solid Conducting Polymer Electrolytes are of technological interest due to their possible application as solid Electrolytes in different devices such as energy conversion units(Batteries, Fuel Cells), smart windows, photo-electrochemical solar cells. This book contains the development and characterization of Poly Ethylene Oxide(PEO) complexed with different bicarbonate salts and their characterization by several spectroscopic techniques IR, XRD, DSC, SEM and Composition & Temperature Dependance Conductivity and transport number measurements which were employed to characterize these polymer electrolyte systems. First the speed of the developments in Solid Ion Conducting Polymer Electrolytes for Batteries, sensors and low temperature fuel cells makes it necessary to record another "snapshot of this research field." Second, this detailed book/monograph narrows the field into study of Ion Conducting Materials, Characterization, processing and properties relevant to device applications that require bulk, and mainly Ionic Materials for device applications.
Author: Malay K. Das
Publisher: Springer
ISBN: 3319698664
Category : Technology & Engineering
Languages : en
Pages : 250
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Book Description
This book is an ensemble of six major chapters, an introduction, and a closure on modeling transport phenomena in porous media with applications. Two of the six chapters explain the underlying theories, whereas the rest focus on new applications. Porous media transport is essentially a multi-scale process. Accordingly, the related theory described in the second and third chapters covers both continuum‐ and meso‐scale phenomena. Examining the continuum formulation imparts rigor to the empirical porous media models, while the mesoscopic model focuses on the physical processes within the pores. Porous media models are discussed in the context of a few important engineering applications. These include biomedical problems, gas hydrate reservoirs, regenerators, and fuel cells. The discussion reveals the strengths and weaknesses of existing models as well as future research directions.
Author: Jeffrey Anders Fimrite
Publisher:
ISBN:
Category : Fuel cells
Languages : en
Pages : 248
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Book Description
Author: T. W. Chapman
Publisher: The Electrochemical Society
ISBN: 1566776597
Category : Science
Languages : en
Pages : 185
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Book Description
Quantitative methods for the analysis and design of electrochemical systems have progressed greatly over the past forty years. Much of this progress is due to the work of Professor John Newman of the University of California-Berkeley. A tutorial symposium was organized to recognize Prof. Newman¿s contributions on the occasion of his 70th birthday. This issue contains a series of invited lectures covering the basic principles of electrochemical engineering as well as a variety of examples of applications in electrodeposition, fuel cells, batteries, and electrolytic processes.
