Akademik Veri Yönetim Sistemi
CHEMPHYSCHEM, cilt.25, sa.22, 2024 (SCI-Expanded)
Double perovskite oxides are key players as oxygen evolution and oxygen reduction catalysts in alkaline media due to their tailorable electronic structures by doping. In this study, we synthesized B-site doped NdBaCoaFe2-aO5+delta (a=1.0, 1.4, 1.6, 1.8) electrocatalysts, systematically probed their bifunctionality and assessed their performance in zinc-air batteries as air cathodes. X-ray photoelectron spectroscopy analysis reveals a correlation between iron reduction and increased oxygen vacancy content, influencing electrocatalyst bifunctionality by lowering the work function. The electrocatalyst with highest cobalt content, NdBaCo1.8Fe0.2O5+delta exhibited a bifunctionality value of 0.95 V, outperforming other synthesized electrocatalysts. Remarkably, NdBaCo1.8Fe0.2O5+delta, demonstrated facilitated charge transfer rate in oxygen evolution reaction with four-electron oxygen reduction reaction process. As an air cathode in a zinc-air battery, NdBaCo1.8Fe0.2O5+delta demonstrated superior performance characteristics, including maximum capacity of 428.27 mA h at 10 mA cm-2 discharge current density, highest peak power density of 64 mW cm-2, with an enhanced durability and stability. It exhibits lowest voltage gap change between charge and discharge even after 350 hours of cyclic operation with a rate capability of 87.14 %.