Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Equivalent Circuit Modeling And Performance Analysis Of Pem Fuel Cells Using Electrochemical Impedance Spectroscopy
Download Equivalent Circuit Modeling And Performance Analysis Of Pem Fuel Cells Using Electrochemical Impedance Spectroscopy full books in PDF, epub, and Kindle. Read online Equivalent Circuit Modeling And Performance Analysis Of Pem Fuel Cells Using Electrochemical Impedance Spectroscopy ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Equivalent Circuit Modeling and Performance Analysis of PEM Fuel Cells Using Electrochemical Impedance Spectroscopy by : Aparna Mukundrao Dhirde
Download or read book Equivalent Circuit Modeling and Performance Analysis of PEM Fuel Cells Using Electrochemical Impedance Spectroscopy written by Aparna Mukundrao Dhirde and published by . This book was released on 2009 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrochemical Phenomena in the Cathode Impedance Spectrum of PEM Fuel Cells by : Samuel Cruz-Manzo
Download or read book Electrochemical Phenomena in the Cathode Impedance Spectrum of PEM Fuel Cells written by Samuel Cruz-Manzo and published by Elsevier. This book was released on 2022-06-18 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrochemical Phenomena in the Cathode Impedance Spectrum of PEM Fuel Cells: Fundamentals, Modelling, and Applications establishes how the electrochemical and diffusion mechanisms of a polymer electrolyte membrane fuel cell (PEMFC) are related to electrochemical impedance spectroscopy (EIS) measurements using physics-based impedance models derived from fundamental electrode and diffusion theories. The contribution of the different phenomena occurring at the different layers comprising the cathode on the impedance response of the PEMFC is revealed through EIS-modelling analysis. The relation between EIS measurements and polarisation curves representing the performance of PEMFCs is established. Insight is gained into how the EIS response of the PEMFC changes at different operating conditions e.g. relative humidity, load demand, gas reactant stoichiometry and temperature using physics-based impedance models. The application of impedance models with EIS measurements carried out in the individual cells comprising a PEMFC stack is demonstrated, while recent modelling approaches and other impedance models reported in the literature to represent the EIS response of the PEMFC are also considered and discussed. - Provides further understanding of ambiguities during the interpretation of the electrochemical impedance spectrum of the PEMFC - Includes impedance models written in MATLAB® for replication or application to other PEMFC-EIS measurements - Includes impedance spectra of the PEMFC at different operating conditions, electro/diffusion pathways for derivation of the impedance models and flowcharts for application of the impedance models with real-world measured EIS data
Book Synopsis Electrochemical Impedance Spectroscopy in PEM Fuel Cells by : Xiao-Zi (Riny) Yuan
Download or read book Electrochemical Impedance Spectroscopy in PEM Fuel Cells written by Xiao-Zi (Riny) Yuan and published by Springer Science & Business Media. This book was released on 2009-11-25 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Electrochemical Impedance Spectroscopy in PEM Fuel Cells" discusses one of the most powerful and useful diagnostic tools for various aspects of the study of fuel cells: electrochemical impedance spectroscopy (EIS). This comprehensive reference on EIS fundamentals and applications in fuel cells contains information about basic principles, measurements, and fuel cell applications of the EIS technique. Many illustrated examples are provided to ensure maximum clarity and observability of the spectra. "Electrochemical Impedance Spectroscopy in PEM Fuel Cells" will enable readers to explore the frontiers of EIS technology in PEM fuel cell research and other electrochemical systems. As well as being a useful text for electrochemists, it can also help researchers who are unfamiliar with EIS to learn the technique quickly and to use it correctly in their fuel cell research. Managers or entrepreneurs may also find this book a useful guide to accessing the challenges and opportunities in fuel cell technology.
Book Synopsis In Situ Diagnosis of Electrolytic and Fuel Cells Using Electrochemical Impedance Spectroscopy by : Sanchit Khurana
Download or read book In Situ Diagnosis of Electrolytic and Fuel Cells Using Electrochemical Impedance Spectroscopy written by Sanchit Khurana and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In situ EIS data are presented for the CuCl/HCl electrolyzer and Liquid Metal Anode Solid Oxide Fuel Cells (LMA-SOFC) operating under different conditions. The durability of the CuCl electrolyzer operating for 168 hours while maintaining the high current density of 0.3 A cm-2 under 0.7 V is reported for the first time. The impedance spectra of the cell, along with the polarization curves (V-I data), show the effect of operating temperature and contact pressure at the end plates of the membrane electrode assembly (MEA). After the durability test, the potential required to maintain the cell at 0.3 A cm-2 increased from 630 mV of the fresh membrane electrode assembly (MEA) to 710 mV. The increase in the ohmic resistance of the membrane by 41 % was observed to be the primary cause of degradation. Starting from 0.6 [omega] cm2, there was a small change in the ohmic resistance of the cell during the first 90 hours, followed by a significant increase of 25 %, and then attained a steady value of 0.85 [omega] cm2. Simultaneously, a change in the decomposition potential was observed as it increased from 0.18 V in the beginning to 0.25 V at the end of testing. This is mainly due to the decrease in efficiency of the regeneration column and dilution of the anolyte solution over time. Further, the use of EIS in the through-plane conductivity cell proved to be a reliable and time-efficient method for evaluation new and existing membranes before testing in the electrolyzer. A liquid metal anode solid oxide fuel cell (LMA-SOFC) is constructed to study the kinetics and transport properties of the system. The behavior of the system is investigated by operating the cell as a metal-air battery while operating under argon, and as a fuel cell with hydrogen and coal as the fuel feeds. EIS signatures and OCP analysis provides insight into the reaction mechanism and indicate the formation of a SnO2 layer at the electrolyte/anode interface. The OCP of 0.885 and 1.117 V was observed for the coal and hydrogen powered fuel cell, respectively. The results show the gradual increase in efficiency of the reduction of SnO2 by using carbon and hydrogen as the fuels. The EIS spectra obtained for the hydrogen fed cell was a characteristic of the diffusion controlled systems and equivalent circuit modeling was used to calculate the oxygen diffusion coefficients. The effective oxygen diffusion coefficients of 1.9 10-3 cm2 s-1 at 700 oC, 2.3 10-3 cm2 s-1 at 800 oC and 3.5 10-3 cm2 s-1 at 900 oC are similar to the published results. The resistance added by the SnO2 layer was the primary cause of degradation and further improvements in performance rely heavily on minimizing losses in the liquid Sn layer.
Book Synopsis Water Content Estimation and Control of PEM Fuel Cell Stack and the Individual Cell in Vehicle by : Po Hong
Download or read book Water Content Estimation and Control of PEM Fuel Cell Stack and the Individual Cell in Vehicle written by Po Hong and published by Springer Nature. This book was released on 2022-01-17 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on water content estimation and control of the PEM fuel cell stack and the individual cell in vehicle. Firstly, the mathematical connection between polarization curve and equivalent circuit model proves importance of MEA and its feasibility to study water content. Optimizing structure of MEA realizes the internal water content recirculation of a fuel cell and improves its performance under middle or lower current density. The influence of water content on performance of MEA is quantified, and variation of equivalent circuit model is an excellent indicator of water content. Secondly, the comprehensive online AC impedance measurement method is put forward, including current excitation method, weak voltage and current signal processing method, and method for analyzing measurement error, and experiment validates measurement accuracy. The high-frequency impedance and statistical characteristic are proposed as indicator of water content. Finally, the dynamic model of the air supply system of a fuel cell engine is established and the closed-loop control of the air supply system and the water content estimation are decoupled. The experiment on a fuel cell system validates the proposed method for searching optimized operating conditions and the water management strategy.
Book Synopsis Fuel Cell Fundamentals by : Ryan O'Hayre
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.
Book Synopsis High Temperature Polymer Electrolyte Membrane Fuel Cells by : Qingfeng Li
Download or read book High Temperature Polymer Electrolyte Membrane Fuel Cells written by Qingfeng Li and published by Springer. This book was released on 2015-10-15 with total page 561 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Electrochemical Impedance Spectroscopy by : Mark E. Orazem
Download or read book Electrochemical Impedance Spectroscopy written by Mark E. Orazem and published by John Wiley & Sons. This book was released on 2011-10-13 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using electrochemical impedance spectroscopy in a broad range of applications This book provides the background and training suitable for application of impedance spectroscopy to varied applications, such as corrosion, biomedical devices, semiconductors and solid-state devices, sensors, batteries, fuel cells, electrochemical capacitors, dielectric measurements, coatings, electrochromic materials, analytical chemistry, and imaging. The emphasis is on generally applicable fundamentals rather than on detailed treatment of applications. With numerous illustrative examples showing how these principles are applied to common impedance problems, Electrochemical Impedance Spectroscopy is ideal either for course study or for independent self-study, covering: Essential background, including complex variables, differential equations, statistics, electrical circuits, electrochemistry, and instrumentation Experimental techniques, including methods used to measure impedance and other transfer functions Process models, demonstrating how deterministic models of impedance response can be developed from physical and kinetic descriptions Interpretation strategies, describing methods of interpretating of impedance data, ranging from graphical methods to complex nonlinear regression Error structure, providing a conceptual understanding of stochastic, bias, and fitting errors in frequency-domain measurements An overview that provides a philosophy for electrochemical impedance spectroscopy that integrates experimental observation, model development, and error analysis This is an excellent textbook for graduate students in electrochemistry, materials science, and chemical engineering. It's also a great self-study guide and reference for scientists and engineers who work with electrochemistry, corrosion, and electrochemical technology, including those in the biomedical field, and for users and vendors of impedance-measuring instrumentation.
Book Synopsis Fast Electrochemical Impedance Spectroscopy by : Pavle Boškoski
Download or read book Fast Electrochemical Impedance Spectroscopy written by Pavle Boškoski and published by Springer. This book was released on 2017-05-07 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a review of electrochemical impedance spectroscopy (EIS) and its application in online condition monitoring of electrochemical devices, focusing on the practicalities of performing fast and accurate EIS. The first part of the book addresses the theoretical aspects of the fast EIS technique, including stochastic excitation signals, time-frequency signal processing, and statistical analysis of impedance measurements. The second part presents an application of the fast EIS technique for condition monitoring and evaluates the performance of the proposed fast EIS methodology in three different types of electrochemical devices: a Li-ion battery, a Li-S cell, and a polymer electrolyte membrane (PEM) fuel cell. Uniquely, in addition to theoretical aspects the book provides practical guidelines for implementation, commissioning, and exploitation of EIS for condition monitoring of electrochemical devices, making it a valuable resource for practicing engineers as well as researchers.
Book Synopsis PEM Fuel Cell Diagnostic Tools by : Haijiang Wang
Download or read book PEM Fuel Cell Diagnostic Tools written by Haijiang Wang and published by CRC Press. This book was released on 2011-08-25 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: PEM Fuel Cell Diagnostic Tools presents various tools for diagnosing PEM fuel cells and stacks, including in situ and ex situ diagnostic tools, electrochemical techniques, and physical/chemical methods. The text outlines the principles, experimental implementation, data processing, and application of each technique, along with its capabilities and weaknesses. The book covers many diagnostics employed in the characterization and determination of fuel cell performance. It discusses commonly used conventional tools, such as cyclic voltammetry, electrochemical impedance spectroscopy, scanning electron microscopy, and transmission electron microscopy. It also examines special tools developed specifically for PEM fuel cells, including transparent cells, cathode discharge, and current mapping, as well as recent advanced tools for diagnosis, such as magnetic resonance imaging and atomic force microscopy. For clarity, the book splits these diagnostic methodologies into two parts—in situ and ex situ. To better understand the tools, PEM fuel cell testing is also discussed. Each self-contained chapter provides cross-references to other chapters. Written by international scientists active in PEM fuel cell research, this volume incorporates state-of-the-art technical advances in PEM fuel cell diagnosis. The diagnostic tools presented help readers to understand the physical and chemical phenomena involved in PEM fuel cells.
Book Synopsis Polymer Electrolyte Fuel Cell Degradation by : Matthew M. Mench
Download or read book Polymer Electrolyte Fuel Cell Degradation written by Matthew M. Mench and published by Academic Press. This book was released on 2012 with total page 474 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. [...] 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.
Book Synopsis Experimental Characterization and Diagonosis Tools for Proton Exchange Membrane Fuel Cells by : Mauricio Primucci
Download or read book Experimental Characterization and Diagonosis Tools for Proton Exchange Membrane Fuel Cells written by Mauricio Primucci and published by . This book was released on 2012 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fuel cell is a device that gives electric power directly from electrochemical reduction and oxidation reactions. PEM fuel cells present some properties that make them appropriate for portable and transport applications: high efficiency, no emissions, solid electrolyte, low operating temperatures and high power density. However, some technical problems can be improved, durability of the materials and the appropriate control of the operating conditions. One important aspect of the operating conditions is the water management. The right water content is needed in the electrolyte and catalyst layers to maximize the efficiency of the PEMFC by minimizing the voltage losses. Water content in the fuel cell is given basically by the generation of the water in the cathode due to the reaction, the humidity of the inlet gases and the transport trough the membrane. This thesis studies, proposes and compares different experimental characterisation methods aimed to provide performance indicators of the PEMFC water state. A systematic use of Electrochemical Impedance Spectroscopy technique is presented and its results are studied in order to analyse the influence of different operating conditions over the PEMFC response. The variables under analysis include: load current, pressure temperature and gas relative humidity. All these variables are considered with inlet gases feeding: H2/O2 and H2/Air. A set of relevant characteristics from the EIS response has been considered. Several equivalent circuits has been analysed and those that have the best fitting with the experimental EIS data are selected. When air is used as oxidant, a simple equivalent circuit with a resistance and a Warburg element is proposed. When Oxygen is used as oxidant, a more complex equivalent circuit is needed. A detailed sensitive analysis is performed indicating those parameters that best capture the influence of the operating conditions. A new experimental characterisation technique, based on the inlet gases humidification interruption is proposed. This dynamic technique combines the information extracted from EIS and the temporal response in order to study the water transport and storage effects in the PEMFC. Two advantages of this proposed technique is the simple hardware configuration used and the relative low impact on the fuel cell response, making attractive the humidification interruption as an in-situ technique. Three different sets of performance indicators are proposed as diagnosis tool. Relevant Characteristics from the EIS response, if properly monitored, can give a diagnostic of the fuel cell internal state. After an analysis, the chosen ones are: low and high frequency resistances (RLF and RHF) and the frequency of the maximum phase. These RC are helpful to determine if the PEMFC with the current operating conditions is well humidified. If the zone defined by RLF decrease, RHF slight increase and the frequency of the maximum phase increase is minimal, the cathode is optimally humidified. Equivalent Circuit are used in order to give a physical interpretation. The selected parameters as performance indicators are: membrane resistance, Rm, time constant and resistance of diffusion process (using Warburg elements: Tw and Rw). In this case, the humidification of the fuel cell is optimum if the zone where Rw and Tw decrease and Rm has slow increase is minimal. Model Based performance indicators are proposed: Rm, effective diffusion coefficient, Deff and effective active area, Aeff. The optimal humidification occurs when the zone where Deff is stationary and Rm has not changed significantly, is minimal. The parameter Aeff involved in this last diagnosis procedure can be detached from the humidification interruption test and be used to estimate the effective active area and then is also helpful to compare the PEMFC performance in different operating conditions.
Book Synopsis Proton Exchange Membrane Fuel Cells by : Alhussein Albarbar
Download or read book Proton Exchange Membrane Fuel Cells written by Alhussein Albarbar and published by Springer. This book was released on 2017-11-17 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the characteristics of Proton Exchange Membrane (PEM) Fuel Cells with a focus on deriving realistic finite element models. The book also explains in detail how to set up measuring systems, data analysis, and PEM Fuel Cells’ static and dynamic characteristics. Covered in detail are design and operation principles such as polarization phenomenon, thermodynamic analysis, and overall voltage; failure modes and mechanisms such as permanent faults, membrane degradation, and water management; and modelling and numerical simulation including semi-empirical, one-dimensional, two-dimensional, and three-dimensional models. It is appropriate for graduate students, researchers, and engineers who work with the design and reliability of hydrogen fuel cells, in particular proton exchange membrane fuel cells.
Book Synopsis Polymer Electrolyte Fuel Cell Durability by : Felix N. Büchi
Download or read book Polymer Electrolyte Fuel Cell Durability written by Felix N. Büchi and published by Springer Science & Business Media. This book was released on 2009-02-08 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Fuel Cell Diagnostics Using Electrochemical Impedance Spectroscopy by : Ghassan Hassan Mousa
Download or read book Fuel Cell Diagnostics Using Electrochemical Impedance Spectroscopy written by Ghassan Hassan Mousa and published by . This book was released on 2014 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: When a proton exchange membrane (PEM) fuel cell runs short of hydrogen, it suffers from a reverse potential fault. This fault, driven by neighboring cells, can lead to anode catalyst degradation and, through cell reversal, to holes in the membrane due to local heat generation. As a result, hydrogen leaks through the electrically-shorted membrane-electrode assembly (MEA) without being reacted, and it recombines directly with air. This recombination results in a reduction in oxygen concentration on the cathode side of the MEA and a fuel cell voltage reduction. Such voltage reduction can be detected by using electrochemical impedance spectroscopy (EIS). In this research, in order to fully understand the effect of this oxygen reduction fault, the impedances of single and multi-cell stacks at different leak rates were measured. Then the impedance signatures were compared with the signatures of stacks having non-leaky cells at different oxygen concentrations with the same current densities. The signatures were analyzed by fitting the leaky stacks and oxygen concentrations impedance data sets with the parameters of a Randles circuit. The correlation between the parameters of the two data sets allows us to understand the change in impedance signatures with respect to a reduction of oxygen in the cathode side. Using the circuit parameters, a model that establishes a relationship between impedance and voltage was also considered. With the help of this model along with the impedance signatures, we are able to detect the reduction of oxygen concentrations at the cathode by using fuzzy logic (FL). However, resolution of detection was reduced with the reduction of leak rate and/or increases in the stack cell-count. The amount of hydrogen leak rates were quantified by simulating the resulting reduced amount of oxygen with the use of neural network (NN) method. Successful implementation of FL and NN methods in a fuel cell system can result in an on-board diagnostics system that can be used to detect and possibly prevent cell reversal failures, and to permit understanding the status of crossover or transfer leaks versus time in operation. Using such system will increase the reliability and performance of fuel cell stacks, where leaks can be detected online and appropriate mitigation criteria can be applied.
Book Synopsis Electrochemical Impedance by : John R. Scully
Download or read book Electrochemical Impedance written by John R. Scully and published by ASTM International. This book was released on 1993 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: The collection of twenty-seven papers published has been grouped into six major categories : corrosion process characterization and modeling, applications of Kramers-Kronig transformations for evaluating the validity of data, corrosion and its inhibition by either corrosion products of specially added inhibitors, corrosion of aluminum and aluminum alloys, corrosion of steel in soils and concrete, and evaluation of coatings on metal substrates.
Book Synopsis Polymer Electrolyte Fuel Cells by : Alejandro A. Franco
Download or read book Polymer Electrolyte Fuel Cells written by Alejandro A. Franco and published by CRC Press. This book was released on 2013-07-09 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
