Premium
Interfacial Electrochemical Behavior of RuS 2 Single Crystal Electrodes in Sulfuric Acid Medium
Author(s) -
Sheu JiangShing,
Shih YenShiang,
Huang YingSheng
Publication year - 1991
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199100072
Subject(s) - chemistry , electrochemistry , cyclic voltammetry , sulfuric acid , electrode , thiosulfate , valence (chemistry) , desorption , single crystal , dissolution , inorganic chemistry , pyrite , analytical chemistry (journal) , sulfur , crystallography , adsorption , mineralogy , organic chemistry , chromatography
The electrochemical behavior of RuS 2 has been studied using cyclic voltammetry and Energy Dispersive X‐ray Spectroscopy (EDX) techniques. Cyclic voltammograms reveal one major anodic peak and two major cathodic peaks on the reverse sweep; these peaks are attributed to the electroadsorption/desorption of OH − groups on the electrode surface. It is proposed that the electroadsorption of the OH − group on RuS 2 is due to the presence of Ru 4d electrons in the uppermost part of the valence band. Thus, OH − is oxidized by holes on Ru 4d states in the first step. These groups are transferred to S 2 2− sites in the second step. EDX surface analysis reveals preferential release of S 2 2− from the pyrite lattice. A mechanism for the anodic dissolution of RuS 2 is proposed, according to which elemental sulfur is not a direct product, but rather the end product which forms from thiosulfate.