Development of a highly stable and active non-precious anode electrocatalyst for oxygen evolution reaction in acidic medium based on nickel and cobalt-containing antimony oxide

The electrocatalysts anodes using base metals on titanium substrate by sol-gel method were synthesized as an alternative due to the scarcity of noble metals, such as iridium and ruthenium. For this purpose, the cobalt anti-monate and nickel-cobalt antimonate stable electrocatalysts to carry out the oxygen evolution reaction (OER) were developed. LSV showed that the cobalt antimonate electrocatalyst has an intrinsic potential of 1.615 V vs. RHE. For the cobalt antimonate electrocatalyst, the potential corresponding to the current density of 10 mA. cm-2 is 1.791 V vs. RHE. The stability of all synthesized anodes at a current density of 10 mA.cm-2 was at least 200 h (more than 8 days) while the CoSb2Ox electrocatalyst displayed a superior lifetime for at least 650 h (more than 27 days) at a current density of 100 mA.cm-2. According to the EIS data at the potential of 1.791 V vs. RHE, the nickel-cobalt antimonate had the lowest charge transfer resistance (Rct) of 4 omega.cm2. The combination of the above results confirms the capability of the proposed anode as a substitute for precious ones.