Abstract
It is essential but challenging to develop advanced electrocatalysts for oxygen evolution reaction (OER) under acidic conditions to break the activity-stability trade-off. In this work, through the controlled partial oxidation of Ru nanoparticles embedded in amorphous carbon, a robust Ru-RuO2 heterostructure with electronic cooperative interfaces was rationally designed and cleverly constructed. The rich heterogeneous interface between Ru and RuO2 creates a good electronic synergy and achieves high-performance OER electrocatalysis in acidic media. The best Ru-RuO2-NC heterostructure exhibits exceptionally excellent activity with an ultralow overpotential (η10) of 176 mV, a high specific mass activity of 1.37 A mgRu−1 (Jm@1.53 V), and an outstanding long-term durability over 80 h at 10 mA cm−2 in acidic environment. More importantly, the Ru-RuO2-NC heterostructure can further be utilized as a bifunctional electrocatalyst to drive acidic overall water splitting with a low cell voltage of 1.55 V and steady operation for at least 40 h at 10 mA cm2, which possesses potential for implementation in the proton exchange membrane water electrolysis.
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