Temperature-Induced Structure Transformation from Co_0.85Se to Orthorhombic Phase CoSe₂ Realizing Enhanced Hydrogen Evolution Catalysis.

ABSTRACT: Transition-metal chalcogenides (TMC) have been widely studied as active electrocatalysts toward the hydrogen evolution reaction due to their suitable d-electron configuration and relatively high electrical conductivity. Herein, we develop a feasible method to synthesize an orthorhombic phase of CoSe₂ (o-CoSe₂) from the regeneration of Co_0.85Se, where the temperature plays a key role in controlling the structure transformation. To the best of our knowledge, this is the first report about this synthetic route for o-CoSe₂. The resulting o-CoSe₂ catalysts exhibit enhanced hydrogen evolution reaction performance with an overpotential of 220 mV to reach 10 mA cm^-2 in 1.0 M KOH. Density functional theory calculations further reveal

SUBMITTER: Bai J 

PROVIDER: S-EPMC9097193 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature