The electrochemical studies of the PE-CVD prepared a-SiC in acidic, alkaline and neutral electrolytes have been carried out to understand the stability and flat band conditions. The anodic current is low in all the three electrolytes and the material is more stable in H(2)SO(4). The hydrogen evolution reaction is more favored in H2SO4. The flat band potential as well as the open-circuit potential shows a linear dependence on the pH of the solution and the slope of the open-circuit potential/flat band potential vs. pH graph is very close to the theoretical value of 60 mV/pH. The a-SiC is sensitive to the pH of the electrolyte. (C) 2003 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.