Electrocatalytic Activation in ReSe2‐VSe2 Alloy Nanosheets to Boost Water‐Splitting Hydrogen Evolution Reaction

) and density of state calculations confirm that alloying and Se vacancies effectively activate the metal sites toward HER. The composition dependence of HER performance is explained by homogenous atomic mixing with the increased Se vacancies. The study provides a strategy for designing new TMD alloy nanosheets with enhanced catalytic activity.