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

Advertising arguments: This quantity maintains to provide rigorously written and edited contributions to big subject matters in electrochemistry, a few of that are of serious technological relevance. historical past conception is handled up to useful. specified emphasis is given to the technique and breadth of purposes of the electrochemical instruments which are awarded the following.

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For instance, Ni chemically deposited on MgO has shown in particular higher resistance to oxidation as a consequence of electronic interactions with MgO [276]. It has already been mentioned that one of most used forms of Ni is Raney Ni which is obtained from Ni-A1 or Ni-Zn alloys by leaching A1 or Zn in alkaline solution. However, the properties of the resulting electrocatalyst appear to depend on the nature of the precursor [135]. Methods of application of the alloys are various [135]. A particularly convenient one is the so-called LPPS (low pressure plasma spray) [146].

After ref. , of Ni2B layers [435]. The structural state of the compound mentioned above has never been explicitly specified. No further results have apparently been published since 1982. 8). Borides and nitrides of other transition metals, in particular the valve metals Zr, Nb, Ta, and W, have not shown any interesting activity for hydrogen evolution [436]. 4 Sulfides Studies of hydrogen evolution on sulfur activated cathodes appeared for the first time (but see ref. 74) in the late 70’s in connection with the development of advanced water electrolyzers [ I l , 12, 437, 4381.

That sulfur compounds can catalyze hydrogen evolution has been clearly observed with non-catalytic metals such as Hg [440, 4411. The compound most commonly used is NiS,, whose composition is variable. But FeS,, CoS,, and NiCoS, (formally NiCo2S4) have also been proposed. Methods of preparation are varied. They go from electrodeposition in the presence of a sulfur compound (thiourea, sulfite, etc. [25, 442]), to electroless coating in the presence of dithionite [443,444], to “pigmented” electrodes (obtained by electrodepositing NiS, dispersed in a Ni bath) 11511, to sulfidization of the related oxide [445].

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