Abstract
Preparation of highly efficient and inexpensive electrodes for oxygen evolution reaction (OER) is of significant importance in the development of water splitting for hydrogen production. Ternary IrO2-Sb2O5-SnO2 and cobalt-based oxides have been suggested to be high stability and low cost electrocatalysts for OER in acid and basic aqueous solution, respectively. Herein, we develop a serial of Ti/CoOx-IrO2-Sb2O5-SnO2 anodes by a simple thermal treatment of mixed metal chlorides on Ti substrate. It is found that the partial-substitution iridium by cobalt in Ti/Ir0.1Sb0.1Sn0.8Ox (Ti/C0ISS) anode shows an improved OER activity in acid and basic solution. For a Ti/Ir0.05Co0.05Sb0.1Sn0.8Ox (Ti/C5ISS) anode, small overpotentials of 0.438 and 0.498 V are needed under the current densities of 10 and 100 mA cm−2 in 0.5 M KOH, respectively. These values are remarkably lower than those of Ti/C0ISS electrode and comparable to other nanometer metal oxides catalysts. Additionally, it exhibits a low Tafel slope of 55 mV dec−1 and displays excellent electrocatalytic durability for OER in alkaline solution under a high current density. These advantages indicate Ti/C5ISS is a promising anode for water oxidation under high current densities.
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