Electrochemical behavior of an Ag/TiO2 composite surfaces

Silver in a form of randomly distributed submicron-sized particles was electrodeposited, and simultaneously, titanium dioxide layer was formed, on the surface of mechanically polished titanium, by its potentiodynamic polarization in an aqueous AgNO₃ solution. In such obtained Ag/TiO₂ composite layer, the particle size distribution, and silver loading were determined by means of scanning electron microscopy. The electrochemical response of this composite layer was studied in both oxygen-free and oxygen saturated aqueous 0.1 M NaOH solution. The catalytic activity toward oxygen reduction reaction of this and other forms of silver- and platinum-based materials was compared.