Ti/RuO2-IrO2-SnO2-Sb2O5 Anodes for Cl2 Evolution from Seawater

Seawater can be used as an electrolyte for Cl-2 evolution, and proper selection of electrode materials is of great importance. In this paper, a new type of dimensionally stable anodes, Ti/RuO2-IrO2-Sb2O5-SnO2, was investigated for Cl-2 evolution from seawater. The physicochemical and electrochemical properties were examined, and the electrocatalytic activity for Cl-2 evolution was measured under different conditions. It was shown that the RuO2-IrO2Sb2O5-SnO2 coating was compact in microstructure. The current efficiency was 71.2-86.7%, depending on the operational conditions. The anodes were predicted to be able to work effectively for over 6 years at a current density of 1500 A m(-2) for seawater electrolysis. (C) The Electrochemical Society of Japan, All rights reserved.