High-Temperature Regulation of Manganese Oxide Hybrid for Efficient Alkaline Oxygen Evolution Reaction

Abstract

Manganese-based oxides with diverse oxidation states, are promising electrochemical catalysts. In this work, we fabricated a novel hybrid electrocatalyst by integrating Mn₂O₃ and α-MnO₂ on carbon paper (CP) using a two-step electrodeposition process, followed by annealing treatments at various temperatures. Notably, the hybrid electrocatalyst demonstrated significant performance enhancements compared to individual manganese oxides. In 1 M KOH electrolyte, the hybrid electrocatalyst displayed superior oxygen evolution reaction (OER) performance, requiring only a low overpotential of 290 mV to reach 10 mA cm^-2. This electrocatalyst also exhibited excellent stability, maintaining performance over 12 hours. The results suggest that the synergistic combination of Mn₂O₃ and MnO₂ plays a crucial role in enhancing OER performance.