Self-Supported Ru-Incorporated NiSe₂ for Ampere-Level Current Density Hydrogen Evolution

To meet the requirements for industrial water splitting to generate hydrogen, it is urgent, but still quite challenging to develop highly active and stable electrocatalysts for large-current-density hydrogen evolution reaction (HER). Herein, Ru-incorporated NiSe₂ (Ru-NiSe₂ ) was designed and synthesized. The introduction of Ru results in the formation of hierarchically structured Ru-NiSe₂ with large electrochemical active surface area, and well-modified electronic structure. As expected, the as-fabricated Ru-NiSe₂ displays impressive HER activity in 1.0 M KOH, with a low overpotential of 180.8 mV to reach the current density of 1000 mA cm^-2 . Ru-NiSe₂ also presents outstanding long-term stability at high current densities, owing to its high intrinsic chemical stability, and strong catalyst-support interface. Notably, when performed at a certain current density of 1000 mA cm^-2 , the overpotential increase after 90 h is only 13 mV. Such excellent HER performance of Ru-NiSe₂ demonstrates its great potential for practical use in industrial water splitting.