Ce0.8Sr0.2CoxFe1-xO3-delta (x=0.2, 0.5, 0.8) - a Perovskite-type nanocomposite for application in the oxygen evolution reaction in alkaline media

Abstract

Three perovskite‐type nanocomposites, i. e. Ce0.8Sr0.2CoxFe1‐xO3‐δ (x=0.2, CSCF1; 0.5, CSCF2; 0.8, CSCF3), were synthesized employing the sol‐gel technique, subsequent to which they were physically and electrochemically evaluated for their electrocatalytic activity towards the oxygen evolution reaction (OER) in alkaline medium (0.1 M KOH) at room temperature (25 °C). Electrochemical characterisation revealed Ce0.8Sr0.2Co0.8Fe0.2O3‐δ (CSCF3) to be the most active having the lowest overpotential at 10 mA cm−2 (440 mV), the lowest Tafel slope (40.7 mV dec−1), the highest mass activity (20.11 mA mg−1) and highest specific activity (2.22 mA cm−2)