Download or read book Kinetics and Mass Transfer in a Direct Methanol Fuel Cell written by Brenda Lee García-Díaz and published by . This book was released on 2007 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct Alcohol Fuel Cells for Portable Applications written by Alexandra M. F. R. Pinto and published by Academic Press. This book was released on 2018-09-08 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct Alcohol Fuel Cells for Portable Applications: Fundamentals, Engineering and Advances presents the fundamental concepts, technological advances and challenges in developing, modeling and deploying fuel cells and fuel cell systems for portable devices, including micro and mini fuel cells. The authors review the fundamental science of direct alcohol fuel cells, covering, in detail, thermodynamics, electrode kinetics and electrocatalysis of charge-transfer reactions, mass and heat transfer phenomena, and basic modeling aspects. In addition, the book examines other fuels in DAFCs, such as formic acid, ethylene glycol and glycerol, along with technological aspects and applications, including case studies and cost analysis. Researchers, engineering professionals, fuel cell developers, policymakers and senior graduate students will find this a valuable resource. The book’s comprehensive coverage of fundamentals is especially useful for graduate students, advanced undergraduate students and those new to the field. Provides a comprehensive understanding of the fundamentals of DAFCs and their basic components, design and performance Presents current and complete information on the state-of-the-art of DAFC technology and its most relevant challenges for commercial deployment Includes practical application examples, problems and case studies Covers the use of other fuels, such as formic acid, ethylene glycol and glycerol
Download or read book Direct Methanol Fuel Cell Technology written by Kingshuk Dutta and published by Elsevier. This book was released on 2020-02-25 with total page 565 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct Methanol Fuel Cell Technology presents the overall progress witnessed in the field of DMFC over the past decade, highlighting the components, materials, functions, properties and features, designs and configurations, operations, modelling, applications, pros and cons, social, political and market penetration, economics and future directions. The book discusses every single aspect of DMFC device technology, the associated advantages and drawbacks of state-of-the-art materials and design, market opportunities and commercialization aspects, and possible future directions of research and development. This book, containing critical analyses and opinions from experts around the world, will garner considerable interest among actual users/scientists/experts. Analyzes developments of membrane electrolytes, electrodes, catalysts, catalyst supports, bipolar plates, gas diffusion layers and flow channels as critical components of direct methanol fuel cells Includes modeling of direct methanol fuel cells to understand their scaling up potentials Discusses commercial aspects of direct methanol fuel cells in terms of market penetration, end application, cost, viability, reliability, social and commercial perception, drawbacks and prospects
Download or read book Mini Micro Fuel Cells written by S. Kakaç and published by Springer Science & Business Media. This book was released on 2008-04-10 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains an archival record of the NATO Advanced Institute on Mini – Micro Fuel Cells – Fundamental and Applications held in Çesme – Izmir, Turkey, July 22–August 3, 2007. The ASIs are intended to be a high-level teaching activity in scientific and technical areas of current concern. In this volume, the reader may find interesting chapters on Mini- Micro Fuel Cells with fundamentals and applications. In recent years, fu- cell development, modeling and performance analysis has received much attention due to their potential for distributed power which is a critical issue for energy security and the environmental protection. Small fuel cells for portable applications are important for the security. The portable devices (many electronic and wireless) operated by fuel cells for providing all-day power, are very valuable for the security, for defense and in the war against terrorism. Many companies in NATO and non-NATO countries have concentrated to promote the fuel cell industry. Many universities with industrial partners committed to the idea of working together to develop fuel cells. As tech- logy advanced in the 1980s and beyond, many government organizations joined in spending money on fuel-cell research. In recent years, interest in using fuel cells to power portable electronic devices and other small equipment (cell phones, mobile phones, lab-tops, they are used as micro power source in biological applications) has increased partly due to the promise of fuel cells having higher energy density.
Download or read book PEM Fuel Cell Modeling and Simulation Using Matlab written by Colleen Spiegel and published by Academic Press. This book was released on 2008 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction -- Fuel Cell Thermodynamics -- Fuel Cell Electrochemistry -- Fuel Cell Charge Transport -- Fuel Cell Mass Transport -- Fuel Cell Energy Balances -- Modeling the Proton Exchange Structure -- Modeling the Catalyst Layers -- Modeling the Gas Diffusion Layers -- Modeling the Fuel Distribution Structures -- Modeling Micro Fuel Cells -- Modeling Fuel Cell Stacks -- Modeling the Fuel Cell Plant -- Model Validation.
Download or read book Characterization of Novel Catalysts for Methanol Oxidation and Oxygen Reduction in Direct Methanol Fuel Cells written by Hwangchan Yoo and published by . This book was released on 2001 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Methanol Transport and Reaction Kinetics in Direct Methanol Fuel Cells written by Srikanth Arisetty and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct Methanol Fuel Cells (DMFCs) have been demonstrated extensively as electrical power sources for portable applications. In DMFCs, the chemical energy stored in methanol is converted directly to electrical energy through a number of chemical, transport and kinetic processes. The overall efficiency of the DMFC system can be improved by optimizing these processes with precise control over operating conditions. The goal of this research is to evaluate optimal operating conditions and system design for improving the DMFC's electrical performance through a combination of experimental strategies and process models. A DMFC system incorporating metal foams as the flow field was designed to increase system efficiency. The influence of metal foam parameters and operating conditions on fuel cell performance was investigated. Our results indicated that due to the opposing effects of methanol concentration on anode and cathode kinetics, there exists an optimal value of methanol concentration at each current density that will yield the highest electrical performance. A control algorithm employing feedback from the fuel cell voltage was implemented to dynamically adjust the methanol feed concentration for peak DMFC performance. Additionally, water and methanol crossover fluxes across the membrane were also measured to understand their transport rates under different conditions. The physico-chemical processes in DMFCs were investigated by developing an accurate mathematical model coupling mass transport with reaction kinetics within the five-layer membrane electrode assembly of the DMFC. An experimental scheme was developed to measure the overpotential contributions of anode methanol oxidation, cathode oxygen reduction and cathode methanol oxidation. Subsequently, the kinetic constants for these three reactions are characterized for various catalyst loadings. The model predicted that methanol undergoes electrochemical adsorption on the Pt/C cathode catalyst layer, followed by both electrochemical and chemical oxidation. The overpotential loss due to methanol oxidation on the cathode with 2 mg/cm 2 catalyst loading is as large as 80 mV at 20 mA/cm 2 . Our model indicated that most of the methanol adsorbed on the cathode catalyst undergoes purely chemical oxidation with oxygen and causes mass transport limitations for oxygen electro-reduction. We also found that the transport of methanol to the anode catalyst layer was significantly enhanced by the convection of CO 2 bubbles towards the flow field. This model should prove useful in optimizing the supply rates of methanol and oxygen in DMFCs.
Download or read book Direct Methanol air Fuel Cells written by and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Successful operation of a direct methanol/air fuel cell system depends upon appropriate integration of the fuel cell components and accommodation of the need for heat and mass transfer within the system. The features of the system that must be considered separately and in an interactive fashion are: (1) the physical state of the fuel feed stream, (2) electrode characteristics, (3) characteristics of the electrolyte, (4) product water removal, (5) heat transfer into our out of the stack, and (6) methanol loss modes. The operating temperature and pressure will be determined, to a large extent, by these features. An understanding of the component features and their interactions is necessary for initial system considerations for direct methanol/air fuel cells.
Download or read book Direct Methanol Fuel Cells written by Electrochemical Society. Energy Technology Division and published by . This book was released on 2001 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Energy Technology, Physical Electrochemistry and Battery Divisions."
Download or read book Electrode Kinetics and Species Transport in Direct Oxidation Methanol Fuel Cells written by Pertti S. Kauranen and published by . This book was released on 1996 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparison of Steam and Autothermal Reforming of Methanol for Fuel Cell Applications written by Hyung Chul Yoon and published by . This book was released on 2008 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct Methanol Fuel Cell with Extended Reaction Zone Anode written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The direct methanol fuel cell (DMFC) is considered to be a promising power source for portable electronic applications and transportation. At present there are several challenges that need to be addressed before the widespread commercialization of the DMFC technology can be implemented. The methanol electro oxidation reaction is sluggish, mainly due to the strong adsorption of the reaction intermediate carbon monoxide on platinum. Further, methanol crosses over to the cathode, which decreases the fuel utilization and causes cathode catalyst poisoning. Another issue is the accumulation of the reaction product CO2 (g) in the anode, which increases the Ohmic resistance and blocks reactant mass transfer pathways. A novel anode configuration is proposed to address the aforementioned challenges. An extended reaction zone (thickness =
Download or read book Direct Methanol written by and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Successful operation of a direct methanol/air fuel cell system depends upon appropriate integration of the fuel cell components and accommodation of the need for heat and mass transfer within the system. The features of the system that must be considered separately and in an interactive fashion are: (1) the physical state of the fuel feed stream, (2) electrode characteristics, (3) characteristics of the electrolyte, (4) product water removal, (5) heat transfer into our out of the stack, and (6) methanol loss modes. The operating temperature and pressure will be determined, to a large extent, by these features. An understanding of the component features and their interactions is necessary for initial system considerations for direct methanol/air fuel cells.
Download or read book Direct Liquid Fuel Cells written by Ramiz Gültekin Akay and published by Academic Press. This book was released on 2020-09-10 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct Liquid Fuel Cells is a comprehensive overview of the fundamentals and specificities of the use of methanol, ethanol, glycerol, formic acid and formate, dimethyl ether, borohydride, hydrazine and other promising liquid fuels in fuel cells. Each chapter covers a different liquid fuel-based fuel cell such as: Anode catalysts of direct methanol fuel cells (DMFCs), future system designs and future trends for direct ethanol fuel cells (DEFCs), development of catalysts for direct glycerol fuel cells (DGFCs), the mechanisms of the reactions taking place at the anode and cathode electrodes, and the reported anode catalysts for direct formic acid fuel cell (DFAFC) and direct formate fuel cell (DFFC), characteristics of direct dimethyl ether fuel cell (DDMEFC), including its electrochemical and operating systems and design, the developments in direct borohydride fuel cells, the development of catalysts for direct hydrazine fuel cells (DHFCs), and also the uncommonly used liquids that have a potential for fuel cell applications including 2-propanol, ethylene glycol, ascorbic acid and ascorbate studied in the literature as well as utilization of some blended fuels. In each part, the most recent literature is reviewed and the state of the art is presented. It also includes examples of practical problems with solutions and a summarized comparison of performance, advantages, and limitations of each type of fuel cell discussed. Direct Liquid Fuel Cells is not a typical textbook but rather designed as a reference book of which any level of students (undergraduate or graduate), instructors, field specialists, industry and general audience, who benefit from current and complete understanding of the many aspects involved in the development and operation of these types of fuel cells, could make use of any chapter when necessary. Presents information on different types of direct liquid fuel cells. Explores information under each section, for specific fuel-based fuel cells in more detail in terms of the materials used. Covers three main sections: direct alcohol, organic fuel-based and inorganic fuel-based fuel cells
Download or read book Proceedings of the Workshop on Direct Methanol Air Fuel Cells written by Albert R. Landgrebe and published by . This book was released on 1992 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Electrocatalysis of Direct Methanol Fuel Cells written by Jiujun Zhang and published by John Wiley & Sons. This book was released on 2009-10-26 with total page 605 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first book to focus on a comprehensive description on DMFC electrocatalysis draws a clear picture of the current status of DMFC technology, especially the advances, challenges and perspectives in the field. Leading researchers from universities, government laboratories and fuel cell industries in North America, Europe and Asia share their knowledge and information on recent advances in the fundamental theories, experimental methodologies and research achievements. In order to help readers better understand the science and technology of the subject, some important and representative figures, tables, photos, and comprehensive lists of reference papers are also included, such that all the information needed on this topic may be easily located. An indispensable source for physical, catalytic, electro- and solid state chemists, as well as materials scientists and chemists in industry.
