3D nickel molybdenum oxyselenide (Ni_1-xMo_xOSe) nanoarchitectures as advanced multifunctional catalyst for Zn-air batteries and water splitting

Rational design of 3D nickel molybdenum oxyselenide (Ni_1-xMo_xOSe) nanoarchitectures with numerous oxygen vacancies is developed through facile and low-cost hydrothermal and followed by selenium ion modulation approach. The experimental and theoretical studies reveal that the optimal Ni_0.5Mo_0.5OSe possesses ultrafast charge-transfer kinetics, which would boost the catalytic activities, enhance the accessibility of electroactive sites, and increase the diffusion networks for oxygen species. Most impressively, the optimal Ni_0.5Mo_0.5OSe affords superior trifunctional activities, outperforming benchmark Pt/C and IrO₂ catalysts. When employed as an air-cathode in flexible Zn-air batteries, it achieves a peak power density of 166.7 mW cm⁻² and outstanding durability for 300 h in ambient air. Furthermore, the water electrolyzer realizes a current density of 10 mA cm⁻² at a cell voltage of 1.51 V, outperforming benchmark Pt/C||IrO₂ couple and reported state-of-the-art catalysts. This consequence provides a general strategy to explore highly efficient multifunctional catalysts with enhanced durability.