By Prof. Dr. Hartmut Wendt, Prof. Dr. Gerhard Kreysa (auth.)
ISBN-10: 3642084060
ISBN-13: 9783642084065
ISBN-10: 366203851X
ISBN-13: 9783662038512
Electrochemical Engineering sounds greatly like chemical engineering, however the chemists, electro chemists, fabric scientists and whoever else comes into contact with technical electrochemical structures very quickly will get the sensation, that chemical engineering knowledge won't get them very some distance in improving their un derstanding and assisting them to unravel their issues of technical electro chemical units. certainly not just the looks of but in addition the physics and actual chemistry in electrochemical reactors - electrolyzers, batteries or gasoline cells and others - are particularly assorted from that of standard chemical reactors. subsequent to interfacial cost move and present density distributions is the rather excessive value of mass move and its situation in liquid electrolytes which distinguishes electrolyzers from chemical reactors. consequently electrochemical engineering technological know-how turned a technology department which initially constructed with little connection with chemical engineering treating the appropriate issues on a excessive mathe maticallevel. This has ended in a undeniable perfection, which this present day - in principl- permits us to version nearly any wanted electrolyzer or mobile configuration with nu merical easy methods to a level and precision which satisfies the top calls for. this is often classical chemical engineering stuff, which, despite the fact that, neglects the chem ical facet of electrochemical technology.
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Extra resources for Electrochemical Engineering: Science and Technology in Chemical and Other Industries
Sample text
29 b) For uncharged particles the last term vanishes whereas AIl~d very often contains implicitly the interfacial potential as AIl~d depends on the rational potential Er=(E-Epzc )' The standard free enthalpy of adsorption AIl~d of uncharged species is often found to vary according to Eq. 30) So for uncharged particles frequently the Gibbs adsorption enthalpy decreases strongly with increasing and decreasing electrode potential starting from the point of zero charge. Therefore it is a rule that uncharged particles are adsorbed most strongly at the potential of zero charge and its vicinity, whereas anion adsorption increases with positive and cation adsorption with negative rational potential.
The solvent-electrode interaction increases strongly as the electrode charge increases with increasing deviation from the point of zero charge, that means with increasing positive or negative rational potential. Therefore at higher anodic or cathodic rational potentials surfactive bulky molecules are pushed out of the Helmholtz layer and replaced by solvent molecules. 38 3 Electrochemical Thermodynamics References 1. D. Dobos, Electrochemical Data, Elsevier, Amsterdam, Oxford, New York, 1975 2.
3) for a spontaneous redox reaction at Eq. 4) a free enthalpy change of ~G
Electrochemical Engineering: Science and Technology in Chemical and Other Industries by Prof. Dr. Hartmut Wendt, Prof. Dr. Gerhard Kreysa (auth.)
by Richard
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