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Author : 林弘益
Publisher :
ISBN 13 :
Total Pages : 106 pages
Book Rating : 4.:/5 (318 download)
Download or read book Performance Analysis of a New Design of Micro Direct Methanol Fuel Cell (-DMFC). written by 林弘益 and published by . This book was released on 2007 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Daniela Falcão
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659343902
Total Pages : 52 pages
Book Rating : 4.3/5 (439 download)
Download or read book Review on Micro-Direct Methanol Fuel Cells written by Daniela Falcão and published by LAP Lambert Academic Publishing. This book was released on 2015-02-18 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fuel cells have unique technological attributes: efficiency, minimization of moving parts and low emissions. The Direct Methanol Fuel Cell (DMFC) has attracted much attention due to its potential applications as a power source for transportation and portable electronic devices. With the advance of micromachining technologies, miniaturization of power sources became one of the trends of evolution of research in this area. Based on the advantages of the scaling laws, miniaturization promises higher efficiency and performance of power generating devices, therefore, Micro-DMFC is an emergent technology. There has been a growing interest in the development of this type of micro cells in the last years, resulting both in experimental studies (operating conditions, cell design and new materials) and in modeling studies. Despite the increase in the knowledge acquired, many challenges are still to be reached. This book provides a detailed comprehensive review both on fundamental and technological aspects of Micro-DMFC. Special attention is devoted to systematization of published results on experimental area and also to a special section dedicated to modeling studies.
Author : 謝豐旭
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (144 download)
Download or read book Performance Analysis for Micro Direct Methanol Fuel Cell with Different Placement Angle written by 謝豐旭 and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 : 洪羚境
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (133 download)
Download or read book Performance Analysis for Micro Direct Methanol Fuel Cell Through Electrochemical Impedance Spectroscopy and Cyclic Voltammetry written by 洪羚境 and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Laam Angela Tse
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (713 download)
Download or read book Membrane Electrode Assembly (MEA) Design for Power Density Enhancement of Direct Methanol Fuel Cells (DMFCs) written by Laam Angela Tse and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Micro-direct methanol fuel cells (micro-DMFC) can be the power supply solution for the next generation of handheld devices. The applications of the micro-DMFCs require them to have high compactness, high performance, light weight, and long life. The major goal of this research project is to enhance the volumetric power density of direct methanol fuel cells (DMFCs). A performance roadmap has been formulated and showed that patterning the planar membrane electrode assembly (MEA) to 2-D and 3-D corrugated manifolds can greatly increase the power generation with very modest overall volume increases. In this project, different manufacturing processes for patterning MEAs with corrugations have been investigated. A folding process was selected to form 2D triangular corrugations on MEAs for experimental validations of the performance prediction. The experimental results show that the volumetric power densities of the corrugated MEAs have improved by about 25% compared to the planar MEAs, which is lower than the expected performance enhancement. ABAQUS software was used to simulate the manufacturing process and identify the causes of deformations during manufacture. Experimental analysis methods like impedance analysis and 4 point-probes were used to quantify the performance loss and microstructure alteration during the forming process. A model was proposed to relate the expected performance of corrugated MEAs to manufacturing process variables. Finally, different stacking configurations and issues related to cell stacking for corrugated MEAs are also investigated.
Author : Yuhao Lu
Publisher :
ISBN 13 :
Total Pages : 241 pages
Book Rating : 4.:/5 (85 download)
Download or read book Designing, Manufacturing, Testing, and Optimizing of Micro-fuel Cells written by Yuhao Lu and published by . This book was released on 2009 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Micro-fuel cells are considered as promising electrochemical power sources in portable electronic devices. Performance of micro-fuel cells are closely related to many factors, such as processes of fabrication, designs of flow fields, and operating conditions. In the present research, micro-proton exchange membrane fuel cells (PEMFCs) and micro-direct methanol fuel cells (DMFCs) were systematically investigated from the aspects of structure design, bipolar/end plates (BPs) fabrication, and fuel cells evaluation. In chapter 3, compared with conventional machining and rapid prototyping (RP) technology, microelectromechanical system (MEMS) technology was the practicable method to fabricate the BPs with channels of a few microns width. Experimental and modeling methods were employed to analyze performance of the micro-PEMFC in chapter 4. Contact resistance changed significantly the distribution of overpotential in the micro-PEMFC and decreased the current output. Small dimensions of the micro-channel drastically affected the species transport and resulted in a non-uniform current distribution along channel direction at low cell potential (high current). In chapters 5, four kinds of flow fields, mixed multichannel serpentine with wide channels, single channel serpentine, double channel serpentine, and mixed multichannel serpentine with narrow channels, were applied to micro-PEMFCs. Results suggested that the micro-PEMFC with good performance should use the flow field with a mixed multichannel design and long micro-channels. In chapter 6, the same flow fields were studied in the micro-DMFCs. Concentration and flow rates of methanol solution affected performance of micro-DMFCs. A micro-DMFC with the long and narrow channels needed to take long time to reach the stable stage when an electric load on it was changed. In chapter 7, a passive air-breathing micro-DMFC with low loading of catalysts was developed. Performance of the passive micro-DMFC became poor with the increase in concentration of methanol solution. Power densities of the passive micro-DMFC drastically depended on the current scanning rate. Finally, cobalt phthalocyanine was introduced to platinum catalyst system to improve and optimize the micro-DMFCs. After heat-treatment at 635 oC, CoPc-Pt/C demonstrated good electrocatalytic activity for oxygen reduction reaction (ORR) and high methanol tolerance. However, CoPc-Pt/C heated at 980 oC showed a good electrocatalytic activity for MOR in DMFCs.
Author : Josh Bianchi
Publisher :
ISBN 13 :
Total Pages : 300 pages
Book Rating : 4.:/5 (843 download)
Download or read book Analysis and Design of a Micro Direct Methanol Fuel Cell with Emphasis on Mass Transport at the Cathode written by Josh Bianchi and published by . This book was released on 2006 with total page 300 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 : Craig Stevenson
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (843 download)
Download or read book Analysis and Design of the Anode of a Passive Micro Direct Methanol Fuel Cell written by Craig Stevenson and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 : 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 : Paul Montagna
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (951 download)
Download or read book The Study, Testing, and Development of Direct Methanol Microscale Fuel Cells written by Paul Montagna and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid increase in instability of fossil fuels has led to a more aggressive search for reliable alternative energy. This has led to the rise of fuel cells as a popular and effective source of energy in large-scale applications. However, their development for usage in small-scale applications is still in its early stages. Many factors and concerns including, but not limited to, flow chamber geometry, electrode geometry, fuel molarity, fuel flow rate, gas flow rates, and electrode fabrication methods, must be further explored and analyzed. Once this is done, a feasible micro fuel cell capable of replacing current comparable lithium-ion batteries in powering small electronics may be developed. This thesis presents a review of micro direct methanol fuel cells (DMFC's) and discusses how each of the above parameters, as well as others, factor into DMFC performance. Initial iterations of a mathematical model used to predict the performance of a DMFC as a function of various experimental parameters is also discussed. Several of these factors, including fuel molarity and flow rate, were further explored using the presented experimental setup and procedure. From this, it was concluded that a methanol fuel molarity of 1M and a fuel flow rate of 18 ml/hr resulted in the highest power densities. It should be noted that these parameters were independently tested, using constant standard parameters to isolate a single testing parameter. While both the experimental and model results are promising, they are just the beginning of the modeling and experimental testing required to produce a feasible final product. Future research plans include further refining the mathematical model and performing experimental tests to measure power density as a function of electrode geometry and fuel temperature.
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 : Fan Li
Publisher : Springer
ISBN 13 : 3662563649
Total Pages : 593 pages
Book Rating : 4.6/5 (625 download)
Download or read book Nanostructured Materials for Next-Generation Energy Storage and Conversion written by Fan Li and published by Springer. This book was released on 2018-04-17 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: The energy crisis and pollution have posed significant risks to the environment, transportation, and economy over the last century. Thus, green energy becomes one of the critical global technologies and the use of nanomaterials in these technologies is an important and active research area. This book series presents the progress and opportunities in green energy sustainability. Developments in nanoscaled electrocatalysts, solid oxide and proton exchange membrane fuel cells, lithium ion batteries, and photovoltaic techniques comprise the area of energy storage and conversion. Developments in carbon dioxide (CO2) capture and hydrogen (H2) storage using tunable structured materials are discussed. Design and characterization of new nanoscaled materials with controllable particle size, structure, shape, porosity and band gap to enhance next generation energy systems are also included. The technical topics covered in this series are metal organic frameworks, nanoparticles, nanocomposites, proton exchange membrane fuel cell catalysts, solid oxide fuel cell electrode design, trapping of carbon dioxide, and hydrogen gas storage.
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 : 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
