NICKEL-SULFUR CATALYSTS IN HYDROGEN EVOLUTION

The electrochemical characteristics and strength of adhesion of active sulfur catalyst coatings were studied. It was shown that the characte ristic length of the hydrogen evolution process is much shorter at ele ctrodes with such catalysts than at Raney nickel surface catalysts. Th e effective exchange current of the hydrogen reaction was determined a t the sulfur catalysts, and reasons were discussed why there is a maxi mum in the relation between exchange currents and thickness of the act ive coating on the electrode. It was found that on the sulfur catalyst s, unlike Raney nickel, practically no hydrogen is adsorbed, hence the y are inactive for hydrogen ionization.