The influence of MOF modification on oxygen evolution and reduction reaction of Fe-doped GdBaCo2O5+δ perovskite

Herein, Fe doping in the B-site of GdBaCo2O5+δ is adopted, that is, GdBaCo2-xFexO5+δ (X = 0.1, 0.2, 0.3, 0.4, 0.5), as efficient electrocatalysts in the alkaline conditions. It was found that Fe doping significantly improved the oxygen evolution reaction (OER) activity of GdBaCo2O5+δ, and the most active electrocatalyst GdBaCo1.6Fe0.4O5+δ showed a low overpotential of 298 mV at 10 mA cm−2. Subsequently, MOF ZIF-67 modification was carried out on the surface of GdBaCo1.6Fe0.4O5+δ, which greatly improved its oxygen reduction reaction (ORR) activity. The modified perovskite shows a high half-wave potential (0.850 V) and the enhanced electrocatalytic stability, which is superior to pristine perovskite and Pt/C.