AI Article Synopsis
- Ruthenium chalcogenides, particularly ruthenium selenide (RuSe), are promising alternatives to platinum for hydrogen evolution reactions (HER), but they face challenges with slow kinetics in alkaline media.
- Researchers have developed Cu-doped Ru/RuSe nanosheets (NSs) to improve H and H2O adsorption strength, leading to more efficient HER performance.
- The Cu-doped NSs show exceptional HER characteristics, including a low overpotential and high stability, indicating that tuning the interface can significantly enhance the performance of electrocatalysts.
Article Abstract
Ruthenium chalcogenide is a highly promising catalytic system as a Pt alternative for hydrogen evolution reaction (HER). However, well-studied ruthenium selenide (RuSe ) still exhibits sluggish HER kinetics in alkaline media due to the inappropriate adsorption strength of H and H O. Herein, xx report a new design of Cu-doped Ru/RuSe heterogeneous nanosheets (NSs) with optimized H and H 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 O adsorption. As a result, Cu-doped heterogeneous Ru/RuSe NSs exhibit a small overpotential of 23 mV at 10 mA cm , a low Tafel slope of 58.5 mV dec and a high turnover frequency (TOF) value of 0.88 s 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 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.
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| http://dx.doi.org/10.1002/adma.202300980 | DOI Listing |
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