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Bifunctional WC-Supported RuO2 Nanoparticles for Robust Water Splitting in Acidic Media.

We report the strong catalyst-support interaction in WC-supported RuO2 nanoparticles (RuO2-WC NPs) anchored on carbon nanosheets with low loading of Ru (4.11 wt.%), which significantly promotes the oxygen evolution reaction activity with η10 of 347 mV and mass activity of 1430 A gRu-1, eight-fold higher than that of commercial RuO2 (176 A gRu-1). Theoretical calculations demonstrate that the strong catalyst-support interaction between RuO2 and WC support could optimize the surrounding electronic structure of Ru sites to reduce reaction barrier. Considering the likewise excellent catalytic ability for hydrogen production, an acidic OWS electrolyzer with good stability constructed by bifunctional RuO2-WC NPs only requires a cell voltage of 1.66 V to afford 10 mA cm-2. The unique 0D/2D nanoarchitectures rationally combined WC support with precious metal oxides provides a promising strategy to tradeoff the high catalytic activity and low cost for acidic OWS application.