ABSTRACT The electrocatalytic hydrogen evolution reaction (HER) in neutral media is fundamentally limited by sluggish water dissociation. Here we report a Ru single‐atom catalyst supported on hydrogen tungsten bronze (Ru─H x WO 3 ) and show that its high activity originates from strong metal–support interaction (SMSI) at the Ru─O─W interface. The strong Ru‐support coupling induces pronounced interfacial polarization, which restructures the local hydration layer and enriches activation‐relevant interfacial water configurations for the Volmer step. As a result, Ru─H x WO 3 achieves an ultralow overpotential of 14 mV at 10 mA cm −2 , delivers a high Ru mass activity of 11.09 A mg Ru −1 at 100 mV, and sustains stable HER operation for 80 h at 1 A cm −2 in neutral media. This work elucidates a complete mechanistic pathway, demonstrating how strong Ru‐support coupling leverages interfacial electronic modulation to dynamically control hydration‐layer structure, thereby accelerating HER kinetics in neutral media.
You et al. (Mon,) studied this question.
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