Dissolution Induced Self-Selective Zn- and Ru-Doped TiO₂Structure for Electrochemical Generation of KClO₃

Abstract

An electrochemical approach towards synthesis of highly active, stable and surface selective towards chlorine evolution reaction (CER) of (Zn, Ru)-doped TiO 2 (Ru 0.26 Ti 0.73 Zn 0.01 O x ) for the purpose of electrochemical generation of KClO 3 is demonstrated. The essential ingredients of this approach consists of (1) coelectrodeposition of Ru, Ti and Zn as metallic alloy and subsequent annealing to oxide (2) dissolution under electrochemically oxidative acidic environment of Ru and Zn-rich surface clusters having high selectivity towards oxygen evolution reaction (OER) leaving Ti-enriched structure that is more selective to CER and (3) using this electrocatalyst for KClO 3 production under near-neutral pH conditions. Dissolution of Ru-and Zn enriched surfaces result in higher porosity and surface roughness. Furthermore, this electrochemical dissolution of (Zn, Ru)-rich surface results in electrocatalytic structure that is self-selective towards KClO 3 formation with higher specific activity.