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Author : Erik Kjeang
Publisher : Unknown
Page : 88 pages
File Size : 40,7 Mb
Release : 2014-07-31
Category : Electronic
ISBN : 3319063472
Author : Yifei Wang,王夷飞
Publisher : Unknown
Page : 128 pages
File Size : 54,6 Mb
Release : 2017-01-26
Category : Electronic
ISBN : 1361041951
This dissertation, "High Performance Fuel-breathing Microfluidic Fuel Cells" by Yifei, Wang, 王夷飞, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of the thesis entitled "HIGH PERFORMANCE FUEL-BREATHING MICROFLUIDIC FUEL CELLS" Submitted by Yifei, Wang for the degree of Doctor of Philosophy at The University of Hong Kong in September 2016 Fuel cells are broadly regarded as one of the most promising power sources. A fuel cell is generally composed of a thin membrane electrolyte sandwiched by two porous electrodes, which has a similar structure with batteries. Fuel cells are very advantageous considering their high energy density, uninterrupted operation and environmental friendliness. To date, the application of this technology is vigorously promoted by the government and industry especially for large-power applications. As for applications with small rated power, the progress is, however, impeded by their high cost, leading to less competitiveness against the mature battery technology. To lower down the cost, microfluidic fuel cell (MFC), also known as the membraneless fuel cell or laminar flow fuel cell, has been proposed recently. A MFC generally utilizes two laminar flows in parallel as electrolyte instead of any solid membrane, therefore, lowering the fabrication cost. To prevent the flows from violent mixing, micro-channel, normally with characteristic length less than 1mm, is requisite. In this manner, the mixing process is dominated by slow diffusion, forming a flow interface in the middle of the channel as a virtual membrane. Despite of its cost advantage, there are still many unsolved problems in MFCs such as poor energy density, trade-off between cell performance and fuel utilization, complex fluidic management, etc. In this thesis, research works on MFC development have been done to improve their cell performance, energy efficiency, energy density, long-term stability, etc. In addition, a novel MFC stacking strategy has been proposed, which was proved to be competent for practical applications. First, conventional liquid-feed MFCs with either co-flow or counter-flow configuration were studied. Their cell performance and fuel utilization were optimized, which were used as benchmarks in subsequent studies. To solve the intractable restrictions in liquid-feed MFCs, vapor-feed MFCs were proposed which breathed fuel vapor from outside the cell instead of acquiring dissolved fuel from the inside electrolyte, therefore, -2 achieving both high power density (55.4mWcm ) and high energy efficiency (9.4%) at the same time. To better understand the mechanism behind its performance, numerical (R) simulation on vapor-feed MFCs was also conducted using COMSOL 4.2. To achieve practical power output, a circular stacking strategy was proposed, which was especially suitable for fuel-breathing MFCs. A six- cell stack was designed and tested, proving that such a stacking strategy was not only highly efficient but also potentially robust to external flow disturbance. The same stacking strategy was also applied to H -fueled MFCs to further improve the power output. By utilizing Al-H O reaction for H generation, 2 2 the proposed Al-feed MFC stack achieved a peak power output of 530mW. Meanwhile, difficulties in hydrogen storage and waste electrolyte management were eliminated. In MFCs with enlarged electrode areas, cathode flooding was inevitably aggravated and cell performance dropped significantly. By cracking the cathode catalyst layer, this problem was greatly alleviated, leading to a m
Author : Erik Kjeang
Publisher : Springer
Page : 81 pages
File Size : 41,9 Mb
Release : 2014-06-14
Category : Technology & Engineering
ISBN : 9783319063461
Microfluidic fuel cells and batteries represent a special type of electrochemical power generators that can be miniaturized and integrated in a microfluidic chip. Summarizing the initial ten years of research and development in this emerging field, this SpringerBrief is the first book dedicated to microfluidic fuel cell and battery technology for electrochemical energy conversion and storage. Written at a critical juncture, where strategically applied research is urgently required to seize impending technology opportunities for commercial, analytical, and educational utility, the intention is for this book to be a ‘one-stop shop’ for current and prospective researchers in the general area of membraneless, microfluidic electrochemical energy conversion. As the overall goal of the book is to provide a comprehensive resource for both research and technology development, it features extensive descriptions of the underlying fundamental theory, fabrication methods, and cell design principles, as well as a thorough review of previous contributions in this field and a future outlook with recommendations for further work. It is hoped that the content will entice and enable new research groups and engineers to rapidly gain traction in their own laboratories towards the development of next generation microfluidic electrochemical cells.
Author : Xiao-Ying Yu
Publisher : BoD – Books on Demand
Page : 424 pages
File Size : 47,7 Mb
Release : 2016-11-23
Category : Science
ISBN : 9789535127857
Increasing innovations and applications make microfluidics a versatile choice for researchers in many disciplines. This book consists of multiple review chapters that aim to cover recent advances and new applications of microfluidics in biology, electronics, energy, and materials sciences. It provides comprehensive views of various aspects of microfluidics ranging from fundamentals of fabrication, flow control, and droplet manipulation to the most recent exploration in emerging areas such as material synthesis, imaging and novel spectroscopy, and marriage with electronics. The chapters have many illustrations showcasing exciting results. This book should be useful for those who are eager to learn more about microfluidics as well as researchers who want to pick up new concepts and developments in this fast-growing field.
Author : Yifei Wang,王夷飞
Publisher : Open Dissertation Press
Page : 255 pages
File Size : 46,9 Mb
Release : 2017-01-26
Category : Fuel cells
ISBN : 1361041935
This dissertation, "High Performance Fuel-breathing Microfluidic Fuel Cells" by Yifei, Wang, 王夷飞, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of the thesis entitled "HIGH PERFORMANCE FUEL-BREATHING MICROFLUIDIC FUEL CELLS" Submitted by Yifei, Wang for the degree of Doctor of Philosophy at The University of Hong Kong in September 2016 Fuel cells are broadly regarded as one of the most promising power sources. A fuel cell is generally composed of a thin membrane electrolyte sandwiched by two porous electrodes, which has a similar structure with batteries. Fuel cells are very advantageous considering their high energy density, uninterrupted operation and environmental friendliness. To date, the application of this technology is vigorously promoted by the government and industry especially for large-power applications. As for applications with small rated power, the progress is, however, impeded by their high cost, leading to less competitiveness against the mature battery technology. To lower down the cost, microfluidic fuel cell (MFC), also known as the membraneless fuel cell or laminar flow fuel cell, has been proposed recently. A MFC generally utilizes two laminar flows in parallel as electrolyte instead of any solid membrane, therefore, lowering the fabrication cost. To prevent the flows from violent mixing, micro-channel, normally with characteristic length less than 1mm, is requisite. In this manner, the mixing process is dominated by slow diffusion, forming a flow interface in the middle of the channel as a virtual membrane. Despite of its cost advantage, there are still many unsolved problems in MFCs such as poor energy density, trade-off between cell performance and fuel utilization, complex fluidic management, etc. In this thesis, research works on MFC development have been done to improve their cell performance, energy efficiency, energy density, long-term stability, etc. In addition, a novel MFC stacking strategy has been proposed, which was proved to be competent for practical applications. First, conventional liquid-feed MFCs with either co-flow or counter-flow configuration were studied. Their cell performance and fuel utilization were optimized, which were used as benchmarks in subsequent studies. To solve the intractable restrictions in liquid-feed MFCs, vapor-feed MFCs were proposed which breathed fuel vapor from outside the cell instead of acquiring dissolved fuel from the inside electrolyte, therefore, -2 achieving both high power density (55.4mWcm ) and high energy efficiency (9.4%) at the same time. To better understand the mechanism behind its performance, numerical (R) simulation on vapor-feed MFCs was also conducted using COMSOL 4.2. To achieve practical power output, a circular stacking strategy was proposed, which was especially suitable for fuel-breathing MFCs. A six- cell stack was designed and tested, proving that such a stacking strategy was not only highly efficient but also potentially robust to external flow disturbance. The same stacking strategy was also applied to H -fueled MFCs to further improve the power output. By utilizing Al-H O reaction for H generation, 2 2 the proposed Al-feed MFC stack achieved a peak power output of 530mW. Meanwhile, difficulties in hydrogen storage and waste electrolyte management were eliminated. In MFCs with enlarged electrode areas, cathode flooding was inevitably aggravated and cell performance dropped significantly. By cracking the cathode catalyst layer, this problem was greatly alleviated, leading to a m
Author : Tim Zhao
Publisher : Academic Press
Page : 312 pages
File Size : 42,8 Mb
Release : 2009-07-07
Category : Technology & Engineering
ISBN : 0080878873
Today's consumers of portable electronics consumers are demanding devices not only deliver more power but also work healthy for the environment. This fact alone has lead major corporations like Intel, BIC, Duracell and Microsoft to believe that Microfuel Cells could be the next-generation power source for electronic products. Compact and readable, Microfuels Principles and Applications, offers engineers and product designers a reference unsurpassed by any other in the market. The book starts with a clear and rigorous exposition of the fundamentals engineering principles governing energy conversion for small electronic devices, followed by self-contained chapters concerning applications. The authors provide original points of view on all types of commercially available micro fuel cells types, including micro proton exchange membrane fuel cells, micro direct methanol fuel cells, micro solid oxide fuel cells and micro bio-fuel cells. The book also contains a detailed introduction to the fabrication of the components and the assembly of the system, making it a valuable reference both in terms of its application to product design and understanding micro engineering principles. *An overview of the micro fuel cell systems and applications. *A detailed introduction to the fabrication of the components and the assembly of the system. *Original points of view on prospects of micro fuel cells.
Author : Huaihe Song,Tuan Anh Nguyen,Ghulam Yasin
Publisher : Elsevier
Page : 473 pages
File Size : 43,7 Mb
Release : 2022-02-23
Category : Technology & Engineering
ISBN : 9780323897914
Nanotechnology in Fuel Cells focuses on the use of nanotechnology in macroscopic and nanosized fuel cells to enhance their performance and lifespan. The book covers the fundamental design concepts and promising applications of nanotechnology-enhanced fuel cells and their advantages over traditional fuel cells in portable devices, including longer shelf life and lower cost. In the case of proton-exchange membrane fuel cells (PEMFCs), nano-membranes could provide 100 times higher conductivity of hydrogen ions in low humidity conditions than traditional membranes. For hydrogen fuel cell, nanocatalysts (Pt hybrid nanoparticles) could provide 12 times higher catalytic activity. This is an important reference source for materials scientists and engineers who are looking to understand how nanotechnology is being used to create more efficient macro- and nanosized fuel cells. Outlines how fuel cells can be nanoengineered to enhance their performance and lifespan Covers a variety of fuel cell types, including proton-exchange membrane fuel cells and hydrogen-based fuel cells Assesses the major challenges of nanoengineering fuel cells at an industrial scale
Author : Liang An,Rong Chen,Yinshi Li
Publisher : Unknown
Page : 0 pages
File Size : 50,7 Mb
Release : 2023
Category : Electronic
ISBN : 3031372735
This book is a state-of-the-art review on recent advances in flow cells for electrochemical energy systems. The book includes an introduction to flow cells, proton exchange membrane fuel cells, photocatalytic fuel cells, organic flow batteries, redox flow batteries, microfluidic flow cells, as well as electrolysis cells for CO2 and nitrogen reduction. The book provides an essential reference for professors, researchers, and policymakers globally in academia, industry, and government.
Author : Liang An,Rong Chen,Yinshi Li
Publisher : Unknown
Page : 0 pages
File Size : 51,6 Mb
Release : 2023
Category : Electronic
ISBN : 3031372727
This book is a state-of-the-art review on recent advances in flow cells for electrochemical energy systems. The book includes an introduction to flow cells, proton exchange membrane fuel cells, photocatalytic fuel cells, organic flow batteries, redox flow batteries, microfluidic flow cells, as well as electrolysis cells for CO2 and nitrogen reduction. The book provides an essential reference for professors, researchers, and policymakers globally in academia, industry, and government.
Author : Vimal Katiyar,Raghvendra Gupta,Tabli Ghosh
Publisher : Springer Nature
Page : 483 pages
File Size : 45,9 Mb
Release : 2019-11-05
Category : Technology & Engineering
ISBN : 9789813298040
This book provides a systematic overview of the processing and applications of sustainable polymers. The volume covers recent advances in biomedical, food packaging, fuel cell, membrane, and other emerging applications. The book begins by addressing different sections of biomedical application including use of carbohydrate-based therapeutics, nanohybrids, nanohydrogels, bioresorbable polymers and their composites, polymer-grafted nanobiomaterials for biomedical devices and implants, nanofibres, and others. The second part of this book discusses various processing and packaging materials for food packaging applications. The last section discusses other emerging applications, including using microbial fuel cells for waste water treatment, microfluidic fuel cells for low power applications, among others. This volume will be relevant to researchers working to improve the properties of bio-based materials for their advanced application and wide commercialization.
Author : Miroslav Cenek
Publisher : Unknown
Page : 68 pages
File Size : 41,6 Mb
Release : 1969
Category : Biochemistry
ISBN : UOM:39015095133040
A review is provided which covers the development, present status, and future outlook of biochemical fuel cell research. Its contents include: Bioelectrochemistry; Biofuel cells; (Fuels for Biofuel cells, Oxidation agents for biofuel cells, Organisms for biofuel cells, Classification of biofuel cells, Electrochemical and biological metabolism, Interelectrode separation, Suitability of materials used in Biofuel Cells, The influence of the Electrode on the Biological Substance); Biogalvanic cells; Biosolar cells; Bioanodes; Biocathodes; Some types of biofuel cells (Biofuel cell urea-oxygen-urease, Biofuel cell lactate-atmospheric oxygen); Comparison of biofuel cells with fuel cells (Advantages of biofuel cells over fuel cells, Drawbacks of biofuel cells in comparison with fuel cells); The medium of the ocean as a giant biofuel cell.
Author : L. O. Vasquez
Publisher : Nova Publishers
Page : 502 pages
File Size : 40,8 Mb
Release : 2007
Category : Science
ISBN : 1600216692
Fuel cells differ from batteries in that they consume reactants, which must be replenished, while batteries store electrical energy chemically in a closed system. Additionally, while the electrodes within a battery react and change as a battery is charged or discharged, a fuel cell's electrodes are catalytic and relatively stable.
Author : Anonim
Publisher : ScholarlyEditions
Page : 51 pages
File Size : 43,8 Mb
Release : 2013-01-10
Category : Technology & Engineering
ISBN : 9781481649179
Issues in Hydrogen, Fuel Cell, Electrochemical, and Experimental Technologies: 2012 Edition is a ScholarlyBrief™ that delivers timely, authoritative, comprehensive, and specialized information about Fuel Cells in a concise format. The editors have built Issues in Hydrogen, Fuel Cell, Electrochemical, and Experimental Technologies: 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Fuel Cells in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Hydrogen, Fuel Cell, Electrochemical, and Experimental Technologies: 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Author : Korneel Rabaey,Lars Angenent,Uwe Schroder,Jurg Keller
Publisher : IWA Publishing
Page : 525 pages
File Size : 40,6 Mb
Release : 2009-12-01
Category : Science
ISBN : 9781843392330
In the context of wastewater treatment, Bioelectrochemical Systems (BESs) have gained considerable interest in the past few years, and several BES processes are on the brink of application to this area. This book, written by a large number of world experts in the different sub-topics, describes the different aspects and processes relevant to their development. Bioelectrochemical Systems (BESs) use micro-organisms to catalyze an oxidation and/or reduction reaction at an anodic and cathodic electrode respectively. Briefly, at an anode oxidation of organic and inorganic electron donors can occur. Prime examples of such electron donors are waste organics and sulfides. At the cathode, an electron acceptor such as oxygen or nitrate can be reduced. The anode and the cathode are connected through an electrical circuit. If electrical power is harvested from this circuit, the system is called a Microbial Fuel Cell; if electrical power is invested, the system is called a Microbial Electrolysis Cell. The overall framework of bio-energy and bio-fuels is discussed. A number of chapters discuss the basics – microbiology, microbial ecology, electrochemistry, technology and materials development. The book continues by highlighting the plurality of processes based on BES technology already in existence, going from wastewater based reactors to sediment based bio-batteries. The integration of BESs into existing water or process lines is discussed. Finally, an outlook is provided of how BES will fit within the emerging biorefinery area.
Author : Dongqing Li
Publisher : Springer Science & Business Media
Page : 2242 pages
File Size : 44,8 Mb
Release : 2008-08-06
Category : Technology & Engineering
ISBN : 9780387324685
Covering all aspects of transport phenomena on the nano- and micro-scale, this encyclopedia features over 750 entries in three alphabetically-arranged volumes including the most up-to-date research, insights, and applied techniques across all areas. Coverage includes electrical double-layers, optofluidics, DNC lab-on-a-chip, nanosensors, and more.
