ELECTROCHEMICAL CHARACTERIZATION OF GRAPHITE COMPOSITE-COATED ELECTRODES FOR HYDROGEN EVOLUTION REACTION

Composite materials with a metallic matrix were prepared from a graphi te powder intercalated with various metals (Pd, Pt, Ph) by electrocode position in aqueous solutions of dissolved nickel or copper. The graph ite particles held in suspension were codeposited with the metal durin g the electrodeposition. The materials were used as electrodes for the hydrogen evolution reaction and characterized by galvanostatic polari zation, AC impedance, and SEM techniques. It is observed that the effe ct of the codeposited particles on the hydrogen evolution reaction is strongly related to the nature of the metallic matrix surrounding the particles. (C) 1997 International Association for Hydrogen Energy.