Cu-Doped Heterointerfaced Ru/RuSe<sub>2</sub> Nanosheets with Optimized H and H<sub>2</sub> O Adsorption Boost Hydrogen Evolution Catalysis.
basic_science · Level V
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- Record sourced from PubMed, PMID 36989611.
- Also identified by DOI 10.1002/adma.202300980.
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Abstract
Ruthenium chalcogenide is a highly promising catalytic system as a Pt alternative for hydrogen evolution reaction (HER). However, well-studied ruthenium selenide (RuSe<sub>2</sub> ) still exhibits sluggish HER kinetics in alkaline media due to the inappropriate adsorption strength of H and H<sub>2</sub> O. Herein, xx report a new design of Cu-doped Ru/RuSe<sub>2</sub> heterogeneous nanosheets (NSs) with optimized H and H<sub>2</sub> O adsorption strength for highly efficient HER catalysis in alkaline media. Theoretical calculations reveal that the superior HER performance is attributed to a synergistic effect of the unique heterointerfaced structure and Cu doping, which not only optimizes the electronic structure with a suitable d-band center to suppress proton overbinding but also alleviates the energy barrier with enhanced H<sub>2</sub> O adsorption. As a result, Cu-doped heterogeneous Ru/RuSe<sub>2</sub> NSs exhibit a small overpotential of 23 mV at 10 mA cm<sup>-2</sup> , a low Tafel slope of 58.5 mV dec<sup>-1</sup> and a high turnover frequency (TOF) value of 0.88 s<sup>-1</sup> at 100 mV for HER in alkaline media, which is among the best catalysts in noble metal-based electrocatalysts toward HER. The present Cu-doped Ru/RuSe<sub>2</sub> NSs interface catalyst is very stable for HER by showing no activity decay after 5000-cycle potential sweeps. This work heralds that heterogeneous interface modulation opens up a new strategy for the designing of more efficient electrocatalysts.