Toward 2D van der Waals Entropy Mixture MX2 (M = Mo, W; X = S, Se, Te) for Hydrogen Evolution Electrocatalysis
Artikel i vetenskaplig tidskrift, 2025

High-entropy alloys have emerged as a 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. In this work, we have explored the synthesis of entropy mixture crystals (TMDmix) involving 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 Mo0.56W0.44(S0.33Se0.35Te0.32)2, with an estimated Delta S mix of 0.96R. When observed along the [001] zone axis, STEM HAADF images indicate the presence of the different crystal phases of the 2D TMDs (1T, 2H, and 3R). Our findings demonstrate the potential of the entropy TMDmix materials as catalysts for the hydrogen evolution reaction, offering an alternative to noble metal-based catalysts. To maximize the potential of TMDmix, we chose chemical exfoliation with the resulting material being subdivided into size groups, big and small, according to their lateral size. In an acidic medium, the lowest overpotential of 127 mV and a Tafel slope of 79 mV/dec were obtained for the exfoliated sample with a small lateral size (exf-TMDsmall).

Electrocatalysis

2D material

High Entropy Alloys

Transition Metal Dichalcogenide

Hydrogen EvolutionReaction

Författare

Jan Pastika

Vysoká škola chemicko-technologická v Praze

Deniz Gungen

Vysoká škola chemicko-technologická v Praze

Amutha Subramani

Vysoká škola chemicko-technologická v Praze

Vlastimil Mazanek

Vysoká škola chemicko-technologická v Praze

Marco Serra

Vysoká škola chemicko-technologická v Praze

Istituto Italiano di Tecnologia

Lunjie Zeng

Chalmers, Fysik, Nano- och biofysik

Eva Olsson

Chalmers, Fysik, Nano- och biofysik

Rui Gusmao

Vysoká škola chemicko-technologická v Praze

Zdenek Sofer

Vysoká škola chemicko-technologická v Praze

ACS Applied Materials & Interfaces

1944-8244 (ISSN) 1944-8252 (eISSN)

Vol. In Press

ARTEMI - en Nationell Forskningsinfrastruktur för Elektronmikroskopi

Stiftelsen för Strategisk forskning (SSF) (RIF21-0026), 2022-09-01 -- 2027-12-31.

Vetenskapsrådet (VR) (2021-00171), 2022-01-01 -- 2026-12-31.

Ämneskategorier (SSIF 2025)

Materialkemi

Den kondenserade materiens fysik

DOI

10.1021/acsami.5c05482

PubMed

40465521

Mer information

Senast uppdaterat

2025-06-18