By Richard C. Alkire, Heinz Gerischer, Dieter M. Kolb, Charles W. Tobias
Advertising arguments: This quantity maintains to supply rigorously written and edited contributions to big themes in electrochemistry, a few of that are of serious technological relevance. history concept is handled up to priceless. exact emphasis is given to the technique and breadth of functions of the electrochemical instruments which are awarded right here.
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Progress in Cathode Activation 47 This has been proven by showing that anodic activation re-establishes the initial behaviour. This is also the case with CoS, . However, the composition of the catalyst changes with time with a constant loss of sulfur [151, 439, 4441. This loss of sulfur has even been invoked as a possible source of activation since it corresponds to leaching out of unbonded and passivating sulfur. The loss of sulfur is readily detected in acid solutions since H2S is evolved, whereas sulfur is leached out as S2in alkaline solution [441,445,448].
Mechanical strain of Pd and Pt has been observed  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.
This turns out to provide an elegant approach to identifying the mechanism of hydrogen evolution [302, 3031. If the rate determining step involves only one active site, a linear decrease of j with OM is observed, otherwise 30 S. 0 Fig. 14. Activity of Pt for hydrogen evolution in 1 M HClO, as a function of the coverage with underpotential deposited Pb. A change in mechanism with Pb coverage is indicated. After ref. 303, by permission of Pergamon Press. 5 if hydrogen atom recombination is the rate determining step .
Advances in electrochemical science and engineering by Richard C. Alkire, Heinz Gerischer, Dieter M. Kolb, Charles W. Tobias