Interfacial Engineering of RuO2@MnO2 Nanosheet Heterostructures for Enhanced Oxygen Evolution Reaction and Efficient Water Electrolysis

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Original abstract

Abstract The development of efficient oxygen evolution reaction (OER) catalysts is critical for scalable water electrolysis and sustainable hydrogen production. In this study, MnO2 nanosheets were uniformly grown on carbon paper via a hydrothermal redox reaction and subsequently employed as a conductive, high-surface area scaffold for the controlled deposition of RuO2 nanoparticles, forming RuO2@MnO2 catalysts. Electrochemical measurements revealed that MnO2 exhibits poor stability under acidic OER conditions, whereas robust activity and stability were achieved in alkaline electrolyte. In 1M NaOH, RuO2@MnO2 catalysts displayed markedly enhanced OER performance compared to MnO2, with the 10mgRuO2@MnO2 catalyst delivering an overpotential reduction of up to 80 mV at 50 mA/cm2 relative to MnO2 and outperforming commercial RuO2 at high current densities. Electrochemical impedance spectroscopy and double-layer capacitance analysis indicate that improved activity originates from increased electrochemically active surface area, enhanced electrical conductivity, and synergistic interfacial interactions between MnO2 and RuO2. When integrated into a RuO2@MnO2ǀǀPt/C electrolyzer, the system achieved current densities of 10, 50, and 100 mA/cm2 at cell voltages of 1.57, 1.64 and 1.69 V, respectively, operated effectively when powered by battery (1.5V) and solar energy sources. These results demonstrated the potential of RuO2@MnO2 composites as efficient and versatile anodes for alkaline water electrolysis.

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