Synthesis of a novel Sr₂TiMnO₆ double perovskite electrocatalyst for rechargeable zinc-air batteries

Perovskite-based catalysts have received a lot attention as bifunctional oxygen evolution reaction and oxygen reduction reaction (ORR/OER) catalysts in secondary rechargeable zinc-air batteries due to their tunable structure, stability at high current densities, low cost, lightweight, and nontoxicity. This paper investigates a new perovskite material, Sr2TiMnO6 (STMO), for a rechargeable zinc-air battery (ZAB). The crystalline structure, morphology, and adsorption/desorption behavior of STMO are thoroughly studied and investigated their catalytic processes. The perovskite catalyst shows high catalytic activities, durability, and endurance in the alkaline medium, resulting in the power density of 97 mW center dot cm(-2), and a specific capacity of 705.21 mAh center dot g(-1). The rechargeable STMO ZAB exhibited good cycling stability with the current density of 3.5 mA center dot cm(-2) for 6.66 h and low overpotential. The observed results promise STMO to be a viable candidate as a functional (ORR/OER) electrocatalyst which can be successfully used for commercial fuel-cells and metal air batteries.