Download or read book Electrochemical Degradation Kinetics Performance Studies Of Solid Oxide Fuel Cells written by Debanjan Das and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Pennsylvania State University The Graduate School Department of Energy & Mineral Engineering ELECTROCHEMICAL DEGRADATION, KINETICS & PERFORMANCE STUDIES OF SOLID OXIDE FUEL CELLS BY LINEAR AND NON-LINEAR FREQUENCY TECHNIQUES A Dissertation in Energy & Mineral Engineering by Debanjan Das © 2016 Debanjan Das Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy May 2016 The Dissertation of Debanjan Das was reviewed and approved* by the following: Serguei N. Lvov Professor of Energy and Mineral Engineering & Materials Science and Engineering, Director of Electrochemical Technologies Program Dissertation Adviser Chair of Committee Derek Elsworth Professor of Energy and Mineral Engineering Sarma Pisupati Professor of Energy & Mineral Engineering Michael Janik Associate Professor of Chemical Engineering Luis F. Ayala Associate Professor of Petroleum and Natural Gas Engineering Associate Department Head for Graduate Education * Signatures are on file in the Graduate School Abstract Linear and Non-linear electrochemical characterization techniques and equivalent circuit modelling were carried out on miniature and sub-commercial Solid Oxide Fuel Cell (SOFC) stacks as an in-situ diagnostic approach to evaluate and analyze their performance under the presence of simulated alternative fuel conditions. The main focus of the study was to track the change in cell behavior and response live, as the cell was generating power. Electrochemical Impedance Spectroscopy (EIS) was the most important linear AC technique used for the study. The distinct effects of inorganic components usually present in hydrocarbon fuel reformates on SOFC behavior have been determined, allowing identification of possible "fingerprint" impedance behavior corresponding to specific fuel conditions and reaction mechanisms. Critical electrochemical processes and degradation mechanisms which might affect cell performance were identified and quantified. Sulfur and siloxane cause the most prominent degradation and the associated electrochemical cell parameters such as Gerisher and Warburg elements are applied respectively for better understanding of the degradation processes. Electrochemical Frequency Modulation (EFM) was applied for kinetic studies in SOFCs for the very first time for estimating the exchange current density and transfer coefficients. EFM is a non-linear in-situ electrochemical technique conceptually different from EIS and is used extensively in corrosion work, but rarely used on fuel cells till now. EFM is based on exploring information obtained from non-linear higher harmonic contributions from potential perturbations of electrochemical systems, otherwise not obtained by EIS. The baseline fuel used was 3 % humidified hydrogen with a 5-cell SOFC sub-commercial planar stack to perform the analysis. Traditional methods such as EIS and Tafel analysis were carried out at similar operating conditions to verify and correlate with the EFM data and ensure the validity of the obtained information. The obtained values closely range from around 11 mA cm-2 - 16 mA cm-2 with reasonable repeatability and excellent accuracy. The potential advantages of EFM compared to traditional methods were realized and our primary aim at demonstrating this technique on a SOFC system are presented which can act as a starting point for future research efforts in this area. Finally, an approach based on in-situ State of Health tests by EIS was formulated and investigated to understand the most efficient fuel conditions for suitable long term operation of a solid oxide fuel cell stack under power generation conditions. The procedure helped to reflect the individual effects of three most important fuel characteristics CO/H2 volumetric ratio, S/C ratio and fuel utilization under the presence of a simulated alternative fuel at 0.4 A cm-2. Variation tests helped to identify corresponding electrochemical/chemical processes, narrow down the most optimum operating regimes considering practical behavior of simulated reformer-SOFC system arrangements. At the end, 8 different combinations of the optimized parameters were tested long term with the stack, and the most efficient blend was determined.
Download or read book Study on Fabrication and Performance of Metal Supported Solid Oxide Fuel Cells written by Yucun Zhou and published by Springer. This book was released on 2017-10-26 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the development of novel metal-supported solid oxide fuel cells (MS-SOFCs). It describes the metal-supported solid oxide fuel cells (MS-SOFCs) that consist of a microporous stainless steel support, nanoporous electrode composites and a thin ceramic electrolyte using the “tape casting-sintering-infiltrating” method. Further, it investigates the reaction kinetics of the fuel cells’ electrodes, structure–performance relationship and degradation mechanism. By optimizing the electrode materials, preparation process for the fuel cells, and nano-micro structure of the electrode, the resulting MS-SOFCs demonstrated (1) great output power densities at low temperatures, e.g., 1.02 W cm-2 at 600°C, when operating in humidified hydrogen fuels and air oxidants; (2) excellent long-term stability, e.g., a degradation rate of 1.3% kh-1 when measured at 650°C and 0.9 A cm-2 for 1500 h. The design presented offers a promising pathway for the development of low-cost, high power-density and long-term-stable SOFCs for energy conversion.
Download or read book Model based Interpretation of the Performance and Degradation of Reformate Fueled Solid Oxide Fuel Cells written by Alexander Kromp and published by KIT Scientific Publishing. This book was released on 2014-05-12 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid oxide fuel cells offer great prospects for the sustainable, clean and safe conversion of various fuels into electrical energy. In this thesis, the performance-determining loss processes for the cell operation on reformate fuels are elucidated via electrochemical impedance spectroscopy. Model-based analyses reveal the electrochemical fuel oxidation mechanism, the coupling of fuel gas transport and reforming chemistry and the impact of fuel impurities on the degradation of each loss process.
Download or read book Solid Oxide Fuel Cell Lifetime and Reliability written by Nigel Brandon and published by Academic Press. This book was released on 2017-05-23 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid Oxide Fuel Cell Lifetime and Reliability: Critical Challenges in Fuel Cells presents in one volume the most recent research that aims at solving key issues for the deployment of SOFC at a commercial scale and for a wider range of applications. To achieve that, authors from different regions and backgrounds address topics such as electrolytes, contaminants, redox cycling, gas-tight seals, and electrode microstructure. Lifetime issues for particular elements of the fuel cells, like cathodes, interconnects, and fuel processors, are covered as well as new materials. They also examine the balance of SOFC plants, correlations between structure and electrochemical performance, methods for analysis of performance and degradation assessment, and computational and statistical approaches to quantify degradation. For its holistic approach, this book can be used both as an introduction to these issues and a reference resource for all involved in research and application of solid oxide fuel cells, especially those developing understanding in industrial applications of the lifetime issues. This includes researchers in academia and industrial R&D, graduate students and professionals in energy engineering, electrochemistry, and materials sciences for energy applications. It might also be of particular interest to analysts who are looking into integrating SOFCs into energy systems. Brings together in a single volume leading research and expert thinking around the broad topic of SOFC lifetime and durability Explores issues that affect solid oxide fuel cells elements, materials, and systems with a holistic approach Provides a practical reference for overcoming some of the common failure mechanisms of SOFCs Features coverage of integrating SOFCs into energy systems
Download or read book Hydrogen and Carbon Monoixde Electrochemical Oxidation Reaction Kinetics on Solid Oxide Fuel Cell Anodes written by Weifang Yao and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Solid Oxide Fuel Cells IV written by Prabhakar Singh and published by John Wiley & Sons. This book was released on 2009-02-11 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a one-stop resource, compiling current research on solid oxide fuel cells. It is a collection of papers from The American Ceramic Society s 32nd International Conference on Advanced Ceramics and Composites, January 27-February 1, 2008. Topics include recent technical progress on materials-related aspects of fuel cells and emerging trends in electrochemical materials, cell/stack fabrication and design, interface engineering, and long-term chemical interactions. This is a valuable, up-to-date resource for researchers in industry, government, or academia who are working with solid oxide fuel cells.
Download or read book High Temperature Solid Oxide Fuel Cells for the 21st Century written by Kevin Kendall and published by Elsevier. This book was released on 2015-11-21 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-temperature Solid Oxide Fuel Cells, Second Edition, explores the growing interest in fuel cells as a sustainable source of energy. The text brings the topic of green energy front and center, illustrating the need for new books that provide comprehensive and practical information on specific types of fuel cells and their applications. This landmark volume on solid oxide fuel cells contains contributions from experts of international repute, and provides a single source of the latest knowledge on this topic. A single source for all the latest information on solid oxide fuel cells and their applications Illustrates the need for new, more comprehensive books and study on the topic Explores the growing interest in fuel cells as viable, sustainable sources of energy
Download or read book Investigating the Effects of Thermally Driven Degradation in Solid Oxide Fuel Cells written by Thomas Michael McDougal Heenan and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most promising devices for low-carbon energy conversion is the solid oxide fuel cell (SOFC). Theoretically, SOFCs show great potential; operating at temperatures between 600-1000 °C the SOFC allows fast reaction kinetics and fuel versatility without the need for expensive platinum catalysts. However in practice, SOFCs can suffer from considerable losses in electrochemical performance due to a multitude of complex degradation mechanisms. This thesis aims to expand our understanding of such mechanisms. Techniques for the three-phase segmentation of SOFC anode materials using nano X-ray computed tomography (CT) and 4D X-ray CT are demonstrated using lab-based instruments, previously only possible using specialist synchrotron facilities. Subsequently, a series of degradation studies are conducted across multiple length-scales using a combination of absorption and diffraction X-ray characterisation methods. Firstly a macroscopic X-ray CT investigation is carried out at cell-level inspecting the effect of start-up time on the delamination of the anode from the electrolyte. Secondly, a microscopic X-ray CT study is conducted on the particle-particle interaction within the anode during operational thermal cycling. Finally, a crystallographic investigation is conducted using synchrotron X-ray powder diffraction to understand the thermo-mechanical properties of anode materials. The experiments reported here improve our understanding of the intrinsic link between the mechanical and electrochemical performance of SOFCs and the influence of microstructure. Understanding is gained from the importance of the materials chosen during manufacturing to the effects of the thermal profiles during operation. These findings are expected to influence the future of SOFC technology from fundamental research to commercial application.
Download or read book Materials for High Temperature Fuel Cells written by San Ping Jiang and published by John Wiley & Sons. This book was released on 2013-04-11 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world's ever-growing demand for power has created an urgent need for new efficient and sustainable sources of energy and electricity. Today's consumers of portable electronics also demand devices that not only deliver more power but are also environmentally friendly. Fuel cells are an important alternative energy source, with promise in military, commercial and industrial applications, for example power vehicles and portable devices. A fuel cell is an electrochemical device that directly converts the chemical energy of a fuel into electrical energy. Fuel cells represent the most efficient energy conversion technologies to-date and are an integral part in the new and renewable energy chain (e.g., solar, wind and hydropower). Fuel cells can be classified as either high-temperature or lowtemperature, depending on their operating temperature, and have different materials requirements. This book is dedicated to the study of high temperature fuel cells. In hightemperature fuel cells, the electrolyte materials are ceramic or molten carbonate, while the electrode materials are ceramic or metal (but not precious metal). High operation temperature fuel cells allow internal reforming, promote rapid kinetics with non-precious materials and offer high flexibilities in fuel choice, and are potential and viable candidate to moderate the fast increase in power requirements and to minimize the impact of the increased power consumption on the environment. 'Materials for High Temperature Fuel Cells' is part of the series on Materials for Sustainable Energy and Development edited by Prof. Max Q. Lu. The series covers advances in materials science and innovation for renewable energy, clean use of fossil energy, and greenhouse gas mitigation and associated environmental technologies.
Download or read book Fuel Cell Engineering written by and published by Academic Press. This book was released on 2012-08-14 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fuel cells are attractive electrochemical energy converters featuring potentially very high thermodynamic efficiency factors. The focus of this volume of Advances in Chemical Engineering is on quantitative approaches, particularly based on chemical engineering principles, to analyze, control and optimize the steady state and dynamic behavior of low and high temperature fuel cells (PEMFC, DMFC, SOFC) to be applied in mobile and stationary systems. Updates and informs the reader on the latest research findings using original reviews Written by leading industry experts and scholars Reviews and analyzes developments in the field
Download or read book Polymer Electrolyte Fuel Cell Degradation written by Matthew M. Mench and published by Academic Press. This book was released on 2011-08-27 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Fuel Cells written by Klaus-Dieter Kreuer and published by Springer Science & Business Media. This book was released on 2012-12-14 with total page 795 pages. Available in PDF, EPUB and Kindle. Book excerpt: The expected end of the “oil age” will lead to increasing focus and reliance on alternative energy conversion devices, among which fuel cells have the potential to play an important role. Not only can phosphoric acid and solid oxide fuel cells already efficiently convert today’s fossil fuels, including methane, into electricity, but other types of fuel cells, such as polymer electrolyte membrane fuel cells, have the potential to become the cornerstones of a possible future hydrogen economy. Featuring 21 peer-reviewed entries from the Encyclopedia of Sustainability Science and Technology, Fuel Cells offers concise yet comprehensive coverage of the current state of research and identifies key areas for future investigation. Internationally renowned specialists provide authoritative introductions to a wide variety of fuel cell types, and discuss materials, components, and systems for these technologies. The entries also cover sustainability and marketing considerations, including comparisons of fuel cells with alternative technologies.
Download or read book Recent Trends in Fuel Cell Science and Technology written by S. Basu and published by Springer Science & Business Media. This book was released on 2007-10-20 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers all the proposed fuel cell systems including PEMFC, SOFC, PAFC, MCFC, regenerative fuel cells, direct alcohol fuel cells, and small fuel cells to replace batteries.
Download or read book Solid Oxide Fuel Cells IX written by S. C. Singhal and published by The Electrochemical Society. This book was released on 2005 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solid Oxide Fuel Cells VIII written by Subhash C. Singhal and published by The Electrochemical Society. This book was released on 2003 with total page 1548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solid Oxide Fuel Cells written by S. C. Singhal and published by The Electrochemical Society. This book was released on 1999 with total page 1226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fuel Cell Fundamentals written by Ryan O'Hayre and published by John Wiley & Sons. This book was released on 2016-05-02 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete, up-to-date, introductory guide to fuel cell technology and application Fuel Cell Fundamentals provides a thorough introduction to the principles and practicalities behind fuel cell technology. Beginning with the underlying concepts, the discussion explores fuel cell thermodynamics, kinetics, transport, and modeling before moving into the application side with guidance on system types and design, performance, costs, and environmental impact. This new third edition has been updated with the latest technological advances and relevant calculations, and enhanced chapters on advanced fuel cell design and electrochemical and hydrogen energy systems. Worked problems, illustrations, and application examples throughout lend a real-world perspective, and end-of chapter review questions and mathematical problems reinforce the material learned. Fuel cells produce more electricity than batteries or combustion engines, with far fewer emissions. This book is the essential introduction to the technology that makes this possible, and the physical processes behind this cost-saving and environmentally friendly energy source. Understand the basic principles of fuel cell physics Compare the applications, performance, and costs of different systems Master the calculations associated with the latest fuel cell technology Learn the considerations involved in system selection and design As more and more nations turn to fuel cell commercialization amidst advancing technology and dropping deployment costs, global stationary fuel cell revenue is expected to grow from $1.4 billion to $40.0 billion by 2022. The sector is forecasted to explode, and there will be a tremendous demand for high-level qualified workers with advanced skills and knowledge of fuel cell technology. Fuel Cell Fundamentals is the essential first step toward joining the new energy revolution.
