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Anodic behavior of platinum electrodes in sulfide solutions and the formation of platinum sulfide

1975; Elsevier BV; Volume: 64; Issue: 1 Linguagem: Inglês

10.1016/s0022-0728(75)80276-2

2590-2954

N. Ramasubramanian,

Electrodeposition and Electroless Coatings

Anodic oxidation of platinum electrodes in aqueous sulfide solutions results in the deposition of sulfur. Platinum sulfide is formed in acidic solutions when in addition to the sulfide, a supporting electrolyte is also present. The anodic sulfidation of platinum bears a close analogy to its anodic oxidation; the primary step of monolayer formation is brought about by the oxidation of adsorbed H2S and SH groups; instantaneous film formation is observed at 1.3±0.1 V during the polarisations. Using sputtered platinum thin film electrodes the presence of platinum monosulfide in the anodic films is confirmed by electron diffraction. The possibility of sulfidation of platinum analogous to its anodic oxidation postulated by Najdeker and Bishop [4] is thus confirmed.