Work

(ReMoV)X 2 (X = S, Se) Ternary Alloy Nanosheets for Enhanced Electrocatalytic Hydrogen Evolution Reaction

Year: 2025

Type: article

Abstract: Modulating the electronic structure of 2D transition metal dichalcogenides via alloying can extend their potential applications. In this study, composition‐tuned ternary alloy nanosheets of (ReMoV)X 2 (X = S and Se) are synthesized using solvothermal and colloidal reactions, respectively. Ternary alloying occurred with homogeneous atomic mixing over a wide range of compositions ( x V = 0.16–0.80). Compared to (ReV)X 2 binary alloying, ternary alloying produces a more metallic phase with less oxidation. Increasing x V induces a phase change into a more metallic 1T phase. The (ReMoV)S 2 nanosheets demonstrate enhanced electrocatalytic activity toward the acidic hydrogen evolution reaction (HER) compared to (ReV)S 2 . Density functional theory calculations predict that ternary alloying increases the metallicity of the nanosheets. In addition, the Gibbs free energy calculation for hydrogen adsorption (ΔG H* ) shows that ternary alloying effectively activates the basal S atoms for the HER, supporting the enhanced catalytic performance observed experimentally.

Source: Small

DOI: 10.1002/smll.202503399