ELECTROCHEMICAL H-2 DIFFUSION IN SI AND NI

The electrochemical hydrogen absorption-desorption in p-Si and Ni spon ge was studied by cyclic voltametry. The voltammogram for Si in the al kaline media in the potential range E = +/-1.8 to +/-0.3 V (vs SCE) sh owed an increase in the hydrogen evolution current at a potential of a bout +/-1.2 V, which indicates hydrogen evolution/absorption at this p otential. The voltammogram for Ni in the alkaline media in the potenti al range E = +/-1.3 to +/-0.2 V (vs SCE) showed a cathodic peak at +/- 1.13 V, which may be attributed to an absorption prewave due to water electroreduction to H-ads. (C) 1998 Published by Elsevier Science Ltd on behalf of the International Association for Hydrogen Energy.