Ce 0.8 Sr 0.2 Co x Fe 1‐x O 3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

Three perovskite‐type nanocomposites, i. e. Ce 0.8 Sr 0.2 Co x Fe 1‐x O 3‐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 Ce 0.8 Sr 0.2 Co 0.8 Fe 0.2 O 3‐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 ).