Title: Linear-sweep voltammetric studies on platinum, rhodium, iridium and zirconium metals in aqueous electrolytes between 20 and 200° C
Abstract: Linear sweep voltammetric studies on platinum, rhodium, iridium and zirconium are reported between 20 and 200°C. The oxide electrode for each metal is used as a reference electrode. With the first three metals, the only significant features of the current—voltage curves at 20°C, between hydrogen and oxygen evolution, are adsorption and desorption of both oxygen and hydrogen. At temperatures of 50 and 100°C the metals become more reactive and show high current densities. Thus the voltammogram obtained with Rh is markedly changed. It is considered from this work that the oxides formed on both Pt and Rh have some solubility at 100°C. At higher temperatures Pt and Ir show clear evidence of undergoing anodic dissolution with the formation of soluble reducible species. Rh appears not to suffer anodic dissolution until a temperature of 200°C is reached. In contrast to the other metals, Zr remained passive over a wide potential range at temperatures up to 150°C; some dissolution was observed however at 200°C.
Publication Year: 1976
Publication Date: 1976-04-25
Language: en
Type: article
Indexed In: ['crossref']
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