Abstract
Ru-based catalysts are widely studied for hydrogen evolution reaction. However, there is still a lack of research on which chemical environment is more favorable for the catalytic performance of Ru. In this work, Ru nanoclusters are loaded on porous Co 3 O 4 nanowires (Ru/Co 3 O 4 NWs), spherical aberration-corrected transmission electron microscope and extended X-ray absorption fine structure confirm the coordination environment of Ru with oxygen bond. Compare to Co nanowires, Ru/Co 3 O 4 NWs have the better HER performance in alkaline medium (an overpotential of 30.96 mV at a current density of 10 mA cm −2 , electrochemical areas of 4.31 mF cm −2 ). Theoretical calculation also demonstrates the charge redistribution of Ru through the O binding, which has a smaller |ΔG H* | value. Besides, Ru clusters are loaded on Co foam and further oxygen doped to achieve efficient and stable HER activity. This work put a deep insight into the role of oxygen regulation of Ru-based HER catalysts. • Ru/Co 3 O 4 NWs were synthesized through cation replacement and controlling reduction. • The surrounding oxygen promoted the charge redistribution of Ru and enhanced its HER activity. • This oxygen-enhanced strategy provided a cost-effective prospect of industrial application.
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