Electrochemical behaviour of the solid electrolyte Ag<inf>6</inf>I<inf>4</inf>WO<inf>4</inf>

Abstract

Electrochemical investigation of the solid electrolyte Ag6I4WO4 (0.8 AgI + 0.2 Ag2WO4 mixture) was performed. By means of cyclic voltammetry, normal pulse polarography and ac polarography methods the electrode processes and the capacity of electric double layer on electrode/electrolyte interface were investigated at several temperature levels (room temperature, 373 K, 386 K and 423 K). It was shown that on the electrode, either a Pt or Ag one, at direct and reverse cathodic polarization, Ag+ ⇌ Ag redox process occurs, and for it a substantial exchange current value was found. Hence it is concluded that the redox process at all the observed temperatures is very fast and that the rate increases with a rise in temperature. Also the passivation of the electrode at anodic polarization affecting the electrolyte decomposition voltage level considerably was pointed out. The electric double-layer capacity values found show that the structure of the layer changes with temperature and dc potential, which is manifested on the capacity. © 1983.