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Download or read book Air Breathing Direct Methanol Fuel Cell written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for activating a membrane electrode assembly for a direct methanol fuel cell is disclosed. The method comprises operating the fuel cell with humidified hydrogen as the fuel followed by running the fuel cell with methanol as the fuel.
Author :
Publisher :
ISBN 13 :
Total Pages : 53 pages
Book Rating : 4.:/5 (644 download)
Download or read book Self-Activated Micro Direct-Methanol Fuel Cell (muDMFC) at Near Room Temperature written by and published by . This book was released on 2005 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research project was focused on the development and testing of Micro Direct-Methanol Fuel Cells (Micro DMFC). A Si-based Micro DMFC was developed and its electrochemical characteristics studied. The peak power density reached 50 mW/sq cm at 60 deg C.A new MEA design was successfully developed to mitigate MeOH crossover without requiring novel membranes. A Micro DMFC was also fabricated by using photochemically etched stainless steel bipolar plates and the performance was improved to achieve a maximum power density of 100 mW/sq cm at 60 deg C and atmospheric pressure. Water crossover through the membrane was found to be a critical issue to limit direct use of high concentration fuel. A solution using the capillary pressure to push water back from the cathode to anode and a thin membrane such as Nafion 112 has been successfully developed. The net water crossover through the membrane was reduced by a factor of five. This paves the way to directly use concentrated fuel on the anode. An 8-cell air-breathing DMFC stack was developed and demonstrated. Cathode flooding was totally avoided using our newly developed water management strategy. It was found that O2 transport in air-breathing operation is sufficient. Results also demonstrated that it is feasible to finally use pure methanol in a completely passive DMFC. Experimental results proved the degassing ability of sandwiched membrane breather to separate CO2 from aqueous methanol fuel stream in the Micro DMFC, and we determined that the bubble breathing feature can take a more active role in the microfluidic management of the whole system. Since the bubble breathing rate can be much faster than condensing rate of vapor bubble, which led to inefficiency of most reported micro bubble pumps, our degassing technique with hydrophobic porous membrane opened a great opportunity for a self-pumping mechanism to circulate the fuel inside Micro DMFC.
Author : Albert R. Landgrebe
Publisher :
ISBN 13 :
Total Pages : 252 pages
Book Rating : 4.F/5 ( download)
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:
Author : 名峰·葉
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (115 download)
Download or read book Flow Channel Visualization and Velocity/Temperature/Concentration Measurements of an Air-breathing Micro Direct Methanol Fuel Cell Stack written by 名峰·葉 and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Electrochemical Society. Energy Technology Division
Publisher :
ISBN 13 :
Total Pages : 366 pages
Book Rating : 4.3/5 (91 download)
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."
Author : Jiujun Zhang
Publisher : John Wiley & Sons
ISBN 13 : 3527323775
Total Pages : 605 pages
Book Rating : 4.5/5 (273 download)
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.
Author : Kingshuk Dutta
Publisher : Elsevier
ISBN 13 : 0128191597
Total Pages : 565 pages
Book Rating : 4.1/5 (281 download)
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
Author : Travis Robert Ward
Publisher :
ISBN 13 :
Total Pages : 222 pages
Book Rating : 4.:/5 (747 download)
Download or read book Experimental and Numerical Investigations of Tubular-shaped Direct Methanol Fuel Cells (DMFCs) written by Travis Robert Ward and published by . This book was released on 2011 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Daniel Knox
Publisher :
ISBN 13 :
Total Pages : 112 pages
Book Rating : 4.:/5 (823 download)
Download or read book Performance Characteristics of PBI-based High Temperature Direct Methanol Fuel Cells written by Daniel Knox and published by . This book was released on 2012 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This thesis investigates the effect of temperature, methanol concentration, and oxidant type on the performance of a Direct Methanol Fuel Cell (DMFC) using two versions of a commercially available polybenzimidazole (PBI)-based membrane electrode assembly (MEA): the Celtec®-P 1000 MEA of original thickness and double thickness. The PBI-based MEA's were tested under the vapor-phase methanol concentrations of 1M, 2M, 3M, 5M, 7.5M, and 10M, temperatures of 160-180°C, and oxidants of oxygen and air. It was found that performance increased with temperature and that oxygen outperformed air as methanol concentrations increased. The double thickness PBI-based MEA, was more resistant to methanol crossover and performed better with increasing methanol concentrations. Thus, these commercial MEAs may be suitable for developing higher temperature DMFCs.
Author : Rose Hernandez
Publisher : Nova Science Publishers
ISBN 13 : 9781536126037
Total Pages : 0 pages
Book Rating : 4.1/5 (26 download)
Download or read book Direct Methanol Fuel Cells written by Rose Hernandez and published by Nova Science Publishers. This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Chapter One, L. Khotseng and G. Vaivars provide an overview of the recent advances in electrocatalysts for direct methanol fuel cells for both anode and cathode catalysts in order to present direct methanol fuel cells as an alternative power source for portable devices. In Chapter Two, Nobuyoshi Nakagawa, Mohammad Ali Abdelkareem, Takuya Tsujiguchi, and Mohd Shahbudin Masdar propose a fuel supply layer using a porous carbon plate (PCP) for DMFCs allowing for the use of high methanol concentrations. The proposed layer is comprised of a thin PCP layer, as well as a gap layer that has a mechanism to supply the methanol as a vapor. Next, Chapter Three by D.S. Falcão, J. P. Pereira, and A.M.F.R. Pinto review the multiphase flow in fuel cells modelling approaches while also reviewing the flow visualisation techniques for flow analysis in fuel cells. Chapter Four by B.A. Braz, V.B. Oliveira, and A.M.F.R. Pinto closes the book by discussing the key work that has been done to improve the passive DMFC performance and providing a review on the most recent developments in passive DMFCs.
Author :
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (16 download)
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.
Author : Christoph Hartnig
Publisher : Elsevier
ISBN 13 : 0857095471
Total Pages : 437 pages
Book Rating : 4.8/5 (57 download)
Download or read book Polymer Electrolyte Membrane and Direct Methanol Fuel Cell Technology written by Christoph Hartnig and published by Elsevier. This book was released on 2012-03-19 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer electrolyte membrane fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs) technology are promising forms of low-temperature electrochemical power conversion technologies that operate on hydrogen and methanol respectively. Featuring high electrical efficiency and low operational emissions, they have attracted intense worldwide commercialization research and development efforts. These R&D efforts include a major drive towards improving materials performance, fuel cell operation and durability. In situ characterization is essential to improving performance and extending operational lifetime through providing information necessary to understand how fuel cell materials perform under operational loads.This two volume set reviews the fundamentals, performance, and in situ characterization of PEMFCs and DMFCs. Volume 1 covers the fundamental science and engineering of these low temperature fuel cells, focusing on understanding and improving performance and operation. Part one reviews systems fundamentals, ranging from fuels and fuel processing, to the development of membrane and catalyst materials and technology, and gas diffusion media and flowfields, as well as life cycle aspects and modelling approaches. Part two details performance issues relevant to fuel cell operation and durability, such as catalyst ageing, materials degradation and durability testing, and goes on to review advanced transport simulation approaches, degradation modelling and experimental monitoring techniques.With its international team of expert contributors, Polymer electrolyte membrane and direct methanol fuel cell technology Volumes 1 & 2 is an invaluable reference for low temperature fuel cell designers and manufacturers, as well as materials science and electrochemistry researchers and academics. - Covers the fundamental science and engineering of polymer electrolyte membrane fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs), focusing on understanding and improving performance and operation - Reviews systems fundamentals, ranging from fuels and fuel processing, to the development of membrane and catalyst materials and technology, and gas diffusion media and flowfields, as well as life cycle aspects and modelling approaches - Details performance issues relevant to fuel cell operation and durability, such as catalyst ageing, materials degradation and durability testing, and reviews advanced transport simulation approaches, degradation modelling and experimental monitoring techniques
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Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (684 download)
Download or read book Direct Methanol Fuel Cells written by and published by . This book was released on 1998 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors describe here results of recent efforts at Los Alamos National Laboratory (LANL), devoted to potential application of Direct Methanol Fuel Cells (DMFCs) as (1) portable power sources at the 50 W level, and (2) primary power sources for electric vehicles. In general, DMFC R and D efforts focus on further improvements in anode catalytic activity, fuel utilization (as related to methanol crossover) and air cathode performance in the presence of the presence of the significant flux of aqueous methanol from anode to cathode. There are significant differences between technical parameters and targets for the two different DMFC applications, which the authors have addressed. They include the lower cell temperature (about 60 C) preferred in portable power vs. operation around 100 C as target temperature for transportation applications, and the much stronger concern for cost of catalyst and any other stack materials in DMFCs developed for potential transportation applications. Most, if not all, recent DMFC work for either portable power or potential transportation applications has strongly focused on cells with polymeric (primarily PFSA) membrane electrolytes. In work at LANL, thin film catalysts bonded to the membrane, e.g., by the decal method, provided best results in terms of catalyst utilization and overall cell performance. In most tests, the single DMFC hardware consisted of uncatalyzed carbon-cloth gas-diffusion backings and graphite blocks with machined serpentine flow channels--quite similar to hardware employed in work with hydrogen/air PEFCs. However, the machined graphite hardware has recently been replaced by alternative, non-machined flow-field/bipolar plates, which enables effective air and aqueous methanol solution distribution along an active area of 50 cm2, at a pitch per cell of 2 mm.
Author : Ramiz Gültekin Akay
Publisher : Academic Press
ISBN 13 : 0128187360
Total Pages : 330 pages
Book Rating : 4.1/5 (281 download)
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
Author : Antonio Salvatore Aricò
Publisher :
ISBN 13 : 9781608768653
Total Pages : 0 pages
Book Rating : 4.7/5 (686 download)
Download or read book Direct Methanol Fuel Cells written by Antonio Salvatore Aricò and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with an analysis of materials issues, status of technologies and potential applications of direct methanol fuel cells. The principle of operation of direct methanol fuel cells and the status of knowledge in the basic research areas are presented. The technology of direct methanol fuel cells is discussed in this book with particular regard to fabrication methodologies for the manufacturing of catalysts, electrolytes membrane-electrode assemblies, stack hardware and system design.
Author : Horacio R. Corti
Publisher : Springer Science & Business Media
ISBN 13 : 9400777086
Total Pages : 377 pages
Book Rating : 4.4/5 (7 download)
Download or read book Direct Alcohol Fuel Cells written by Horacio R. Corti and published by Springer Science & Business Media. This book was released on 2013-12-02 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct Alcohol Fuel Cells: Materials, Performance, Durability and Applications begins with an introductory overview of direct alcohol fuel cells (DAFC); it focuses on the main goals and challenges in the areas of materials development, performance, and commercialization. The preparation and the properties of the anodic catalysts used for the oxidation of methanol, higher alcohols, and alcohol tolerant cathodes are then described. The membranes used as proton conductors in DAFC are examined, as well as alkaline membranes, focusing on the electrical conductivity and alcohol permeability. The use of different kinds of carbon materials as catalyst supports, gas diffusion layers, and current collectors in DAFC is also discussed. State of the art of the modeling is used to estimate performance and durability. The closing chapter reviews the use of DAFC in portable equipment and mobile devices and features a detailed discussion on the mechanisms of component degradation which limits their durability. This book is written to facilitate the understanding of DAFC technology, applications, and future challenges. It is an excellent introduction for electrochemical and material engineers interested in small fuel cells as portable energy sources, scientists focused on materials science for energy production and storage, as well as policy-makers in the area of renewable energies.
Author :
Publisher :
ISBN 13 :
Total Pages : 93 pages
Book Rating : 4.:/5 (639 download)
Download or read book Direct Methanol Fuel Cells written by and published by . This book was released on 2007 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:
