Revealing the nature of enhanced catalytic activity by oxygen vacancy and hetero-interface is an important and challenging task. Herein, the high-performance RuO₂@Co₃O₄ electrocatalyst with adjustable heterointerface-vacancy enhancement effect was prepared for the first time. The as-prepared RuO₂@Co₃O₄(1:6) only respectively requires overpotentials of 152, 218 mV for OER and 90, 33 mV for HER in alkaline and acidic solutions to achieve a current density of 10 mA cm⁻². Moreover, the assembled electrolytic cell just need a voltages of 1.46, 1.65 V and 1.52, 1.72 V to achieve 10 and 350 mA cm⁻² under the same conditions. The different ratios of Ru and Co can regulate the number of hetero-interfaces between RuO₂ and Co₃O₄ and the concentration of interfacial oxygen vacancies. The systematically experimental and theoretical results unveil that the hetero-interface with strong electron coupling between RuO₂ and Co₃O₄ accelerates the reaction kinetic and improves the stability of the catalyst. The interfacial oxygen vacancy not only directly participates in the reaction of dissociating H₂O, but also adjusts the position of the d-band center of the catalyst and the adsorption strength of key intermediates, thus enhancing the activity of the catalysts.

揭示氧空位和异质界面增强催化活性的本质是一项重要且具有挑战性的任务。在此，首次制备出具有可调异质界面-空位增强效应的高性能RuO ₂ @Co ₃ O _{4电催化剂。}所制备的 RuO ₂ @Co ₃ O ₄ (1:6) 在碱性和酸性溶液中仅分别需要 152、218 mV 的 OER 过电位和 90、33 mV 的 HER 过电位，以实现 10 mA cm ⁻²的电流密度. 此外，组装的电解池仅需要1.46、1.65 V和1.52、1.72 V的电压即可达到10和350 mA cm ^-2在相同的条件下。_{不同的Ru和Co配比可以调节RuO 2}和Co ₃ O ₄之间异质界面的数量和界面氧空位的浓度。系统的实验和理论结果表明，RuO ₂和Co ₃ O ₄之间具有强电子耦合的异质界面加速了反应动力学并提高了催化剂的稳定性。界面氧空位不仅直接参与离解H ₂ O的反应，而且调节催化剂d带中心的位置和关键中间体的吸附强度，从而提高催化剂的活性。