Transport Interactions Between Gas And Water In Thin Hydrophobic Porous Layers

Author : Stefan Dwenger
Publisher : Logos Verlag Berlin GmbH
Page : 188 pages
File Size : 44,6 Mb
Release : 2016-01-29
Category : Fuel cells
ISBN : 9783832541972

Get Book

Transport interactions between gas and water in thin hydrophobic porous layers by Stefan Dwenger Pdf

In the last decades it has become clear that the transport of gas and water inside the mixed-wettable gas diffusion medium (GDL) plays a significant role for the improved understanding and optimization of the polymer electrolyte membrane fuel cells (PEMFC). In the present thesis the influence of liquid water and gas on the transport properties of gas diffusion media of polymer electrolyte membrane fuel cells (PEMFC) is examined numerically and experimentally. The different arising transport mechanisms and their influence as well as their representation in theoretical models (especially REV-based Darcy models) are presented. Moreover, an approach for modelling and simulation of the water distribution inside mixed-wettable porous media, especially gas diffusion layers, is discussed. To this end, a thermodynamical-based approach is chosen - the interactions between gaseous, liquid, and solid (carbon and PTFE) phases are treated with the help of a stationary scheme based on the interfacial energies which have to be minimized. For the optimization task itself the (parallel) simulated annealing approach is chosen and discussed. In addition algorithms for the generation and discretization of the virtual porous structures are described. Based on the results the modelling of constitutive relationships and transport parameters depending on water and PTFE content is performed. Besides that experiments for the measurement of those relationships are developed. A special focus is on the precise compression of the GDL sample and the influence on capillary pressure-saturation relationship, relative permeabilities, and effective diffusivities. Different apparatus for in- and through-plane measurements are developed. At the end the derived transport parameters and relationships are applied to a REV-based Darcy model which is compared with an integral experiment. The experimental setup is motivated by the counter-current flow regime of liquid water and gas at the cathode side of the PEMFC. It has been demonstrated that Darcy-flow based models for porous media are also applicable to thin technical porous layers.

Author : T. Fuller
Publisher : The Electrochemical Society
Page : 2220 pages
File Size : 52,6 Mb
Release : 2008-10
Category : Fuel cells
ISBN : 9781566776486

Get Book

Proton Exchange Membrane Fuel Cells 8 by T. Fuller Pdf

This international symposium is devoted to all aspects of research, development, and engineering of proton exchange membrane (PEM) fuel cells and stacks, as well as low-temperature direct-fuel cells. The intention is to bring together the international community working on the subject and to enable effective interactions between research and engineering communities.

Author : Brian D. Fath
Publisher : CRC Press
Page : 843 pages
File Size : 50,6 Mb
Release : 2020-07-29
Category : Law
ISBN : 9781000065626

Get Book

Managing Air Quality and Energy Systems by Brian D. Fath Pdf

Presents the basic knowledge and key processes of the atmosphere and its systems. Addresses new and cutting-edge topics on ecosystem services, resilience, sustainability, food-energy-water nexus, socio-ecological systems, and more. Provides an excellent basic knowledge on environmental systems, explains how these systems function and offers strategies on how to best manage them. Includes the most important problems and solutions facing environmental management today. Written by leading environmental experts from around the world.

Author : Haijiang Wang,Hui Li,Xiao-Zi Yuan
Publisher : CRC Press
Page : 952 pages
File Size : 43,8 Mb
Release : 2019-08-21
Category : Science
ISBN : 9781439863169

Get Book

PEM Fuel Cell Durability Handbook, Two-Volume Set by Haijiang Wang,Hui Li,Xiao-Zi Yuan Pdf

While PEM fuel cells are highly efficient, environmentally friendly sources of power, their durability hinders the commercialization of this technology. With contributions from international scientists active in PEM fuel cell research, PEM Fuel Cell Durability Handbook, Two-Volume Set provides a comprehensive source of state-of-the-art research in

Author : Haijiang Wang,Xiao-Zi Yuan,Hui Li
Publisher : CRC Press
Page : 580 pages
File Size : 42,6 Mb
Release : 2011-08-25
Category : Science
ISBN : 9781439839195

Get Book

PEM Fuel Cell Diagnostic Tools by Haijiang Wang,Xiao-Zi Yuan,Hui Li Pdf

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.

Author : Jürgen Garche,Chris K. Dyer,Patrick T. Moseley,Zempachi Ogumi,David A. J. Rand,Bruno Scrosati
Publisher : Newnes
Page : 4532 pages
File Size : 47,9 Mb
Release : 2013-05-20
Category : Science
ISBN : 9780444527455

Get Book

Encyclopedia of Electrochemical Power Sources by Jürgen Garche,Chris K. Dyer,Patrick T. Moseley,Zempachi Ogumi,David A. J. Rand,Bruno Scrosati Pdf

The Encyclopedia of Electrochemical Power Sources is a truly interdisciplinary reference for those working with batteries, fuel cells, electrolyzers, supercapacitors, and photo-electrochemical cells. With a focus on the environmental and economic impact of electrochemical power sources, this five-volume work consolidates coverage of the field and serves as an entry point to the literature for professionals and students alike. Covers the main types of power sources, including their operating principles, systems, materials, and applications Serves as a primary source of information for electrochemists, materials scientists, energy technologists, and engineers Incorporates nearly 350 articles, with timely coverage of such topics as environmental and sustainability considerations

Author : Mohamed Khayet Souhaimi,Mohamed Khayet,Takeshi Matsuura
Publisher : Elsevier
Page : 493 pages
File Size : 41,7 Mb
Release : 2011-10-13
Category : Science
ISBN : 9780444531261

Get Book

Membrane Distillation by Mohamed Khayet Souhaimi,Mohamed Khayet,Takeshi Matsuura Pdf

Modern membrane engineering is critical to the development of process-intensification strategies and to the stimulation of industrial growth. Membrane Distillation (MD) is a broad reference that covers specific information on membranes available and methods for MD membrane preparation and characterization. The book offers an introduction to the terminology and fundamental concepts as well as a historical review of MD development. Commercial membranes used in MD as well as laboratory-made membranes, including emerging membranes, are described in detail and illustrated by a number of clear and instructive schematic drawings and images. A comprehensive review on the development of MD membranes, MD modules, MD membrane characterization, MD configurations, applications in different areas and theoretical models Introduction to the terminology and fundamental concepts associated with MD as well as an historical review of MD development Description of commercial membranes used in MD as well as laboratory-made membranes, including emerging membranes

Author : Roger De Jaeger
Publisher : Nova Publishers
Page : 390 pages
File Size : 48,9 Mb
Release : 2004
Category : Science
ISBN : 1594540241

Get Book

Synthesis and Characterizations of Poly(organophosphazenes) by Roger De Jaeger Pdf

Gleria (materials science, Padova University, Italy) and De Jaeger (chemistry, University of Sciences and Technologies, France) present the latest work in the synthesis and characterization of poly(organophosphazenes). The book opens with a general introduction on background, developments, and future perspectives, then covers the synthetic aspects of phosphazene polymers, with chapters on areas such as ambient temperature cationic condensation synthesis of polyphosphazenes and high molecular weight polyspirophosphazenes. Chapters on the characterization of phosphazene polymers in solution explore topics including thermal and mechanical properties of polyphosphazenes and electrochemical behavior of phosphazenes. Annotation : 2004 Book News, Inc., Portland, OR (booknews.com).

Author : Mario Gleria,R. De Jaeger
Publisher : Nova Publishers
Page : 1066 pages
File Size : 49,8 Mb
Release : 2004
Category : Science
ISBN : 159033423X

Get Book

Phosphazenes by Mario Gleria,R. De Jaeger Pdf

The main aim of this book is to provide a complete picture of current research on phosphazene compounds carried out around the world. The book opens with a general introduction, then moves on to cover synthetic aspects of phosphazene polymers, their characterization in solution and from the theoretical, thermal, and mechanical points of view; application aspects of poly(organophosphazenes); and the synthesis, characterization, and practical utilization of cyclophosphazenes. There is particular focus on the use of cyclophosphazenes as hydraulic fluids and additives, as cores for star polymers or dendrimers, and as starting substrates for supramolecular chemistry and nanostructured materials. The spectroscopic characterization of these compounds by NMR and Raman techniques is also discussed. Annotation : 2004 Book News, Inc., Portland, OR (booknews.com).

Author : Ahmad Fauzi Ismail,Pei Sean Goh
Publisher : Elsevier
Page : 632 pages
File Size : 53,5 Mb
Release : 2018-03-28
Category : Science
ISBN : 9780128135754

Get Book

Carbon-based Polymer Nanocomposites for Environmental and Energy Applications by Ahmad Fauzi Ismail,Pei Sean Goh Pdf

Carbon-Based Polymer Nanocomposites for Environmental and Energy Applications provides the fundamental physico-chemical characterizations of recently explored carbon-based polymer nanocomposites, such as carbon nanotubes, graphene and its derivatives, nanodiamond, fullerenes and other nano-sized carbon allotropes. The book also covers the applications of carbon-based polymer nanocomposite in the environmental and energy fields. Topics range from the various approaches that have been explored and developed for the fabrication of carbon-based polymer nanocomposite, to their applications in tackling environmental and energy related issues. Provides a clear picture of the current state-of-the-art and future trends in carbon-based polymer nanomaterials Explains the interactions between nanofiller-polymer matrices and mechanisms related to applications in environmental pollution and energy shortage Includes computational and experimental studies of the physical and chemical properties of carbon-based polymer nanocomposites Features chapters written by world leading experts

Author : Jasna Jankovic,Jürgen Stumper
Publisher : Walter de Gruyter GmbH & Co KG
Page : 555 pages
File Size : 54,5 Mb
Release : 2023-05-22
Category : Technology & Engineering
ISBN : 9783110623604

Get Book

PEM Fuel Cells by Jasna Jankovic,Jürgen Stumper Pdf

This book is a comprehensive introduction to the rapidly developing field of modeling and characterization of PEM fuel cells. It focuses on i) fuel cell performance modeling and performance characterization applicable from single cells to stacks, ii) fundamental and advanced techniques for structural and compositional characterization of fuel cell components and iii) electrocatalyst design. Written by experts in this field, this book is an invaluable tool for graduate students and professionals.

Author : Inamuddin,Tariq Altalhi,Mohd Imran Ahamed,Mohammad Luqman
Publisher : Materials Research Forum LLC
Page : 344 pages
File Size : 46,7 Mb
Release : 2022-03-15
Category : Technology & Engineering
ISBN : 9781644901809

Get Book

Advanced Functional Membranes by Inamuddin,Tariq Altalhi,Mohd Imran Ahamed,Mohammad Luqman Pdf

Functional membranes are used in food processing, sensor technology, medical and biomedical devices, desalination, waste water treatment, CO2 capture, energy production and energy storage, optoelectronics etc. The book reviews recent advances in the field and discusses challenges and perspectives. Keywords: Membrane Fabrication, Polymer Membranes, Self-Assembled Membranes, Molecular Probes, Membrane Fouling, Membrane Cleaning, Microfiltration, Ultrafiltration, Food Processing, Sensors, Medical Devices, Biomedical Applications, Desalination, Wastewater Treatment, Ion Exchange Processes, Polymeric Ceramic Membranes, Nano Holes, Fuel Cells, Lithium-Ion Batteries, Optoelectronics.

Author : P. Somasundaran
Publisher : CRC Press
Page : 1148 pages
File Size : 54,6 Mb
Release : 2006
Category : Colloids
ISBN : 0849396042

Get Book

Encyclopedia of Surface and Colloid Science by P. Somasundaran Pdf

Author : NinaM.K. Lamba
Publisher : Routledge
Page : 288 pages
File Size : 44,6 Mb
Release : 2017-10-19
Category : Medical
ISBN : 9781351423380

Get Book

Polyurethanes in Biomedical Applications by NinaM.K. Lamba Pdf

Polyurethanes in Biomedical Applications studies the use of polyurethanes in implanted medical devices. This analysis describes the concepts of polymer science, the manufacture of polyurethanes, and the biological responses to implant polyurethanes, reflecting the developments in biomaterials science and the interdisciplinary nature of bioengineering.

Author : Paloma Ferreira-Aparicio,Antonio M. Chaparro
Publisher : Academic Press
Page : 237 pages
File Size : 45,8 Mb
Release : 2018-08-04
Category : Science
ISBN : 9780128131299

Get Book

Portable Hydrogen Energy Systems by Paloma Ferreira-Aparicio,Antonio M. Chaparro Pdf

Portable Hydrogen Energy Systems: Fuel Cells and Storage Fundamentals and Applications covers the basics of portable fuel cells, their types, possibilities for fuel storage, in particular for hydrogen as fuel, and their potential application. The book explores electrochemistry, types, and materials and components, but also includes a chapter on the particularities of their use in portable devices, with a focus on proton exchange membrane (PEM) type. Topics cover fuel storage for these cells, in particular hydrogen storage and an analysis of current possibilities. In addition, portable fuel cell systems are examined, covering auxiliary elements required for operation and possibilities for their miniaturization. Engineers and developers of portable applications and electricity will find this book to provide fundamental information on the possibilities of portable hydrogen fuel cells, including costs and market information, for their planning, modeling, development and deployment. Graduate students and lecturers will find this to be a complementary resource in general hydrogen and fuel cell courses or in specialized courses covering portable systems. Presents a current view of the fundamentals and possibilities of portable hydrogen fuel cells, also comparing them with other market solutions, such as batteries Examines the applications where portable hydrogen fuel cell technology is a viable solution Explores future trends and needs in terms of materials, components and systems to improve the possibilities to make hydrogen fuel cells competitive and reliable for future portable applications