PEM Fuel Cells: Theory and PracticeFuel cells are electrochemical energy conversion devices that convert hydrogen and oxygen into water, producing electricity and heat in the process and providing fuel efficiency and reductions in pollutants. Demand for this technology is growing rapidly. Fuel cells are being commercialized for stationary and portable electricity generation, and as a replacement for internal combustion engines in automobiles. Proton Exchange Membrane (PEM) fuel cells in particular are experiencing an upsurge. They have high power density and can vary their output quickly to meet shifts in power demand. Until now, there has been little written about this important technology. This book lays the groundwork for fuel cell engineers, technicians and students. It covers the fundamental aspects of fuel cell design, electrochemistry of the technology, heat and mass transport, system design and applications to bring this technology to professionals at all levels. * Comprehensive guide for engineers, researchers and policymakers * Covers theory and practice of PEM fuel cells * Contains hundreds of original illustrations and real-life engineering examples |
Contents
| 1 | |
| 17 | |
| 33 | |
Main Cell Components Materials Properties and Processes | 73 |
Fuel Cell Operating Conditions | 115 |
Stack Design | 147 |
Fuel Cell Modeling | 207 |
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Common terms and phrases
active area anode applications backup power Barbir battery bipolar plate Calculate carbon catalyst layer cathode cell operating cell polarization curve cell potential cell voltage coefficient combustion compression compressor conductivity coolant current density ÊËÁ ˆ electricity electrochemical reaction Electrochemical Society electrode electrolyte electroosmotic drag energy system engine enthalpy Equation exchange current density flow field fuel cell efficiency fuel cell performance fuel cell power fuel cell stack fuel cell system fuel processor gas diffusion layer gasoline grid heating value higher higher heating value humidification Hydrogen Energy internal combustion engine ionic ionomer liquid water load lower membrane methanol Nafion natural gas nominal power operating temperature outlet overpotential oxidation oxygen PEM fuel cells polarization curve Polymer Electrolyte porous power output pressure drop proton reactant reactant gases result saturated shown in Figure steam reforming stoichiometric ratio system efficiency technologies thermal tion transport typically vehicle water vapor
Popular passages
Page 8 - The electrolyte is retained in a matrix (usually asbestos), and a wide range of electrocatalysts can be used (such as Ni, Ag, metal oxides, and noble metals). This fuel cell is intolerant to CO2 present in either the fuel or oxidant (67).
Page 9 - Molten carbonate fuel cells (MCFC) have the electrolyte composed of a combination of alkali (Li, Na, K) carbonates, which is retained in a ceramic matrix of LiAlO2. Operating temperatures are between 600°-700°C where the carbonates form a highly conductive molten salt, with carbonate ions providing ionic conduction.
Page 30 - Efficiency of a Carnot engine at maximum power output", American Journal of Physics, Vol.
References to this book
PEM Fuel Cell Electrocatalysts and Catalyst Layers: Fundamentals and ... Jiujun Zhang Limited preview - 2008 |