By Richard C. Alkire, Heinz Gerischer, Dieter M. Kolb, Charles W. Tobias
Advertising arguments: This quantity keeps to supply rigorously written and edited contributions to special themes in electrochemistry, a few of that are of serious technological relevance. history idea is handled up to useful. precise emphasis is given to the method and breadth of functions of the electrochemical instruments which are provided right here.
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Extra resources for Advances in electrochemical science and engineering
Results concerning other interstitial compounds are sparse. The hydrogen overpotential on non-stoichiometric TiN, increases with the N content . These materials are thus less active than pure Ti. The Tafel slope is about 120 mV independent of N content. Decrease in M-H bond strength with N content has been suggested. Hydrogen penetration has also been observed. Nickel boride (Ni,B) has been quoted sometimes as an excellent electrocatalyst in alkaline solution [3, 10, 4001. However, there exists only one paper describing a practical stability test [ 1071.
Alternatively, as in the case of Ni, the metal can be co-deposited with ultrafine particles of silicon carbide to form a rougher composite surface . The idea of roughening the electrode surface to enhance its activity is an old trick . The effect of roughening is usually reported just to correspond to an increase in surface area. A thorough investigation  of the nature of the active sites on evaporated films of Ni has led to conclude that the mechanism does not change, with the activity being proportional to the number of active sites.
It is not improbable that some forms of oxides may be present. Voltammetry shows that the active material exhibits a number of redox transitions close to the hydrogen evolution potential, and it is probably a form a surface redox catalysis which actually takes place. The active sites are thus provided by the surface redox centers. The mechanism of hydrogen evolution has been briefly investigated both in acid  and in alkaline solution . The kinetic parameters observed suggest that the mechanism remains the same in both media.