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

Abstract 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 NiSe 2 (Ru‐NiSe 2 ) was designed and synthesized. The introduction of Ru results in the formation of hierarchically structured Ru‐NiSe 2 with large electrochemical active surface area, and well‐modified electronic structure. As expected, the as‐fabricated Ru‐NiSe 2 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‐NiSe 2 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‐NiSe 2 demonstrates its great potential for practical use in industrial water splitting.