Influence of Composition of Ti/SnO2-Sb2O5 Anodes on the Kinetics of Electro-Oxidation of Aqueous Organic Species. (29th July 2016)

• Record Type: Journal Article
• Authors: Ni, Qing; Kirk, Donald W.; Thorpe, Steven J.
• Is Part Of: ECS transactions. Volume 72:Number 35(2016)
• Page Start: 21
• Page End: 34
• Publication Date: 2016-07-29
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/07235.0021ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : SnO2 -Sb2 O5 coated Ti anodes can be used in the anodic oxidation of organic compounds for wastewater treatment. In this work, different SnO2 -Sb2 O5 anode compositions were fabricated using various techniques, such that the composition of the coating was varied from a SnO2 -based to a Sb2 O5 based material. These anodes were tested for the activity in the electro-oxidation of oxalic acid, which served as a model organic compound in wastewater. The activity of the anodes was correlated to the Sb doping level in the coating films. Specifically, the variation in the coverage of electrochemically active surface sites was explained by the arrangement of Sn and Sb on the SnO2 surface, and the catalytic activity in organic oxidation was related to the detailed mechanism of electro-catalysis, modeled by considering a two-step oxidation with surface adsorbed intermediates. The modeled kinetics helps explain the behavior of these anodes in the anodic oxidation of oxalic acid.