Efficient oxygen evolution reaction (OER) catalysts with fast kinetics, high efficiency, and stability are essential for scalable green production of hydrogen. The rational design and fabrication of catalysts play a decisive role in their catalytic behavior. This work presents a high-entropy catalyst, FeCoNiCuMo-O, synthesized via carbothermal shock. Synergistic optimization of the adsorption evolution mechanism (AEM) and lattice oxygen mechanism (LOM) was realized and demonstrated through the combination of in situ spectra/mass spectrometry and chemical probe analysis in FeCoNiCuMo-O. Furthermore, the robust stability is reinforced by the inherent properties conferred by the high-entropy design. The catalyst exhibits outstanding performance metrics, featuring an exceptionally low Tafel slope of 41 mV dec-1, a low overpotential of 272 mV at 10 mA cm-2, and a commendable endurance (a mere 2.2% voltage decline after a 240-h continuous chronopotentiometry test at 10 mA cm-2). This study advances the development of efficient, durable OER electrocatalysts for sustainable hydrogen production.
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