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Two-Dimensional Quaternary Alloys of (RuMoVNb)Se2 for Superior Hydrogen Evolution Reaction Catalysis
Junaid Ihsan1, Ju Yeon Kim1, Irtiqa Mishal1
1Department of Advanced Materials Chemistry, Korea University, Sejong, Republic of Korea.
None:
Alloying 2D transition metal dichalcogenides offers a promising strategy to broaden their applications. Herein, (RuMoVNb)Se2 quaternary alloy nanosheets (xRu = 0-1) were synthesized via colloidal reactions. Incorporation of Ru into the (MoVNb)Se2 maintained exclusively 2D layered structure over wide composition range, accompanied by a phase evolution from the hexagonal 2H to 1T. The quaternary alloying results in more metallic electronic structures than the ternary alloying. First-principles calculations supported the homogenous atomic mixing of quaternary alloys and the favored 2H → 1T phase transition at higher xRu. Compared to (MoVNb)Se2, the quaternary alloys exhibited significantly enhanced electrocatalytic activity toward the hydrogen evolution reaction (HER) across alkaline, acidic, and neutral electrolytes. Gibbs free energy calculations show that Ru atoms optimize hydrogen adsorption, directly correlating with the improved HER performance. In situ X-ray absorption fine structure data (in 1 M KOH) reveal electrolyte adsorption on Ru as key to superior HER catalysis.
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