Development of Ru-based electrocatalysts for acidic oxygen evolution reaction without a trade-off between activity and durability remains challenging. Herein, we constructed Co₃O₄/RuO₂ heterojunctions anchored on carbon (Co₃O₄/RuO₂-C) with a low Ru loading (2.74 wt%), in which strong coupled p-n junctions facilitated electron transfer from RuO₂ to Co₃O₄. The Co₃O₄/RuO₂-C demonstrated a low overpotential of 170 mV at 10 mA cm⁻² and long-term stability in 0.1 M HClO₄ due to its unique structure. The origin of its high performance in acidic OER was revealed by the combination of in-situ attenuated total reflection infrared and Raman tests. Concretely, oxygen generation for Co₃O₄/RuO₂-C was dominated by the adsorbate evolution mechanism, and the introduction of Co₃O₄ facilitated the redox of RuO₂, generating active sites for OER. Theoretical calculations further substantiated that the Co₃O₄/RuO₂ heterojunctions possessed lower energy barriers for OER. This work provides a compelling synthesis route for effective and stable electrocatalysts for acidic OER.

开发用于酸性析氧反应且无需在活性和耐久性之间进行权衡的钌基电催化剂仍然具有挑战性。在此，我们构建了锚定在碳上的Co ₃ O ₄ /RuO _{2异质结（Co 3} O ₄ /RuO ₂ -C），具有低Ru负载量（2.74 wt％），其中强耦合pn结促进电子从RuO ₂转移到Co ₃ O ₄。Co ₃ O ₄ /RuO _{2 -C 在 10 mA cm} ^-2下表现出 170 mV 的低过电势，并且在 0.1 M HClO ₄中具有长期稳定性由于其独特的结构。原位衰减全反射红外和拉曼测试的结合揭示了其在酸性 OER 中的高性能的起源。具体而言，Co ₃ O ₄ /RuO ₂ -C的氧气生成主要由吸附质演化机制决定，Co ₃ O _{4的引入促进了RuO 2}的氧化还原，产生OER活性位点。理论计算进一步证实了Co ₃ O ₄ /RuO ₂异质结具有较低的 OER 能垒。这项工作为有效且稳定的酸性 OER 电催化剂提供了一条令人信服的合成路线。