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+delta is adopted, that is, GdBaCo2-xFexO5+delta (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+delta, and the most active electrocatalyst GdBaCo1.6Fe0.4O5+delta showed a low overpotential of 298 mV at 10 mA cm-2. Subsequently, MOF ZIF-67 modi-fication was carried out on the surface of GdBaCo1.6Fe0.4O5+delta, 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.

Automated summary

In this study, Fe doping in the B-site of GdBaCo2O5+delta (GBCO) was adopted to prepare efficient electrocatalysts for alkaline conditions. Fe doping significantly improved the oxygen evolution reaction (OER) activity of GBCO, with GdBaCo1.6Fe0.4O5+delta showing the lowest overpotential of 298 mV at 10 mA cm-2. Furthermore, the surface of GdBaCo1.6Fe0.4O5+delta was modified with MOF ZIF-67, greatly enhancing its oxygen reduction reaction (ORR) activity compared to the pristine perovskite and Pt/C.