TEMPERATURE INFLUENCE ON THE ELECTROCHEMICAL-BEHAVIOR OF ION-IMPLANTED PYROLYTIC IRIDIUM OXIDE-FILMS

Pyrolytic (prior to and after oxygen-atom implantation) and anodic IrO 2 films are studied at different temperatures by cyclic voltammetry at -0.20 to 1.25V (Ag/AgCl). The surface charge of nonimplanted electrod es is shown to increase relatively irreversibly with the temperature d uring the potential cycling, while that of implanted electrodes decrea ses. The behavior of implanted electrodes after the cycling resembles that of anodic IrO2. The ion doping of the oxide film surfaces is assu med to result in the formation of active centers which induce reductio n of pyrolytic IrO2 to the metal.