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Abstract Designing robust electrocatalysts for water‐splitting is essential for sustainable hydrogen generation, yet difficult to accomplish. In this study, a fast and facile two‐step technique to synthesize Ru/RuO 2 aerogels for catalyzing overall water‐splitting under alkaline conditions is reported. Benefiting from the synergistic combination of high porosity, heterointerface, and tensile strain effects, the Ru/RuO 2 aerogel exhibits low overpotential for oxygen evolution reaction (189 mV) and hydrogen evolution reaction (34 mV) at 10 mA cm −2 , surpassing RuO 2 (338 mV) and Pt/C (53 mV), respectively. Notably, when the Ru/RuO 2 aerogels are applied at the anode and cathode, the resultant water‐splitting cell reflected a low potential of 1.47 V at 10 mA cm −2 , exceeding the commercial Pt/C||RuO 2 standard (1.63 V). X‐ray adsorption spectroscopy and theoretical studies demonstrate that the heterointerface of Ru/RuO 2 optimizes charge redistribution, which reduces the energy barriers for hydrogen and oxygen intermediates, thereby enhancing oxygen and hydrogen evolution reaction kinetics.
Sui et al. (Sun,) studied this question.