Read e-book online Advances in electrochemical science and engineering PDF

By Richard C. Alkire, Heinz Gerischer, Dieter M. Kolb, Charles W. Tobias

ISBN-10: 1560811390

ISBN-13: 9781560811398

ISBN-10: 3527282734

ISBN-13: 9783527282739

Advertising and marketing arguments: This quantity maintains to supply rigorously written and edited contributions to big subject matters in electrochemistry, a few of that are of serious technological relevance. historical past concept is handled up to worthy. exact emphasis is given to the method and breadth of functions of the electrochemical instruments which are awarded right here.

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It has even been claimed [386] that some good performances are specifically due to the formation of oxide layers during the preparation (Fig. 19). An activation of the Ni surface by the application of anodic current pulses has been reported [387] to be beneficial owing to the formation of Ni(OH), layers. This has been confirmed by impedance studies of the mechanism [388]. Surface oxides are easily reducible if formed at low anodic potentials but they can become deactivating if formed at higher potentials, as during a cell shut-down.

3 V) [34, 1371. Mechanical strain of Pd and Pt has been observed [278] to give rise to overpotential variations. Such an effect has been studied to gain insight into the factors responsible for the relationship between surface modifications and electrocatalytic activity. The analysis has shown that, of the various factors scrutinized including the possible variation in the interatomic distance, the most probable one is a change in ionic specific adsorption. Ion implantation is often recommended as an efficient tool to enhance electrocatalysis either by disrupting the surface structure of the catalyst or by placing active atoms on an inactive (or less active) matrix.

Of the possible explanations which can be offered [292], a reasonable one is that the high coverage with adsorbed hydrogen far from equilibrium smoothes down the differences in AHad from face to face. Actually, quantum chemical calculations reproduce more closely the situation at O,+O, which does not usually correspond to the real situation under cathodic load. Another possibility is that the hydridic S. 5- I /eV Fig. 12. Activity of single crystal faces of a number of metals for electrolytic hydrogen evolution as a function of the electron work function.

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Advances in electrochemical science and engineering by Richard C. Alkire, Heinz Gerischer, Dieter M. Kolb, Charles W. Tobias

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