Dataset of "2D van der Waals Entropy Mixture of Transition Metal Dichalcogenides for Hydrogen Evolution Electrocatalysis"

High-entropy alloys have emerged as a novel class of materials, offering unique properties due to their irregular and randomized arrangement of multiple elements in an ordered lattice. This concept has been extended to two-dimensional (2D) van der Waals materials, including transition metal dichalcogenides (TMD), which exhibit promising applications in electrocatalysis. The synthesis of entropy mixture crystals (TMDmix) involved the chemical vapor transport of five individual elements, Mo and W as metal elements, S, Se and Te as chalcogenide elements, resulting in a crystalline structure with a controlled composition MoW(SSeTe)2, with an estimated ΔSmix of 1.44R. When observed along the [001] zone axis, STEM HAADF images indicate to the presence of the different crystal phases of the 2D TMDs (1T, 2H, and 3R). Our findings demonstrate the potential of high-entropy TMDmix materials as catalysts for the hydrogen evolution reaction, as an alternative to noble metal-based catalysts.