Synthesis of High Entropy and Entropy-Stabilized Metal Sulfides and Their Evaluation as Hydrogen Evolution Electrocatalysts

Weichen Xiao, Yi Li, Amr Elgendy, Ercin C. Duran, Mark A. Buckingham, Ben F. Spencer, Bing Han, Firoz Alam, Xiangli Zhong, Sarah H. Cartmell, Robert J. Cernik, Alexander S. Eggeman, Robert A.W. Dryfe, David J. Lewis

Research output: Contribution to journalArticlepeer-review

Abstract

High entropy metal chalcogenides are materials containing five or more elements within a disordered sublattice. These materials exploit a high configurational entropy to stabilize their crystal structure and have recently become an area of significant interest for renewable energy applications such as electrocatalysis and thermoelectrics. Herein, we report the synthesis of bulk particulate HE zinc sulfide analogues containing four, five, and seven metals. This was achieved using a molecular precursor cocktail approach with both transition and main group metal dithiocarbamate complexes which are decomposed simultaneously in a rapid (1 h) and low-temperature (500 °C) thermolysis reaction to yield high entropy and entropy-stabilized metal sulfides. The resulting materials were characterized by powder XRD, SEM, and TEM, alongside EDX spectroscopy at both the micro- and nano-scales. The entropy-stabilized (CuAgZnCoMnInGa)S material was demonstrated to be an excellent electrocatalyst for the hydrogen evolution reaction when combined with conducting carbon black, achieving a low onset overpotential of (∼80 mV) and η10 of (∼255 mV).

Original languageEnglish
Pages (from-to)7904-7914
Number of pages11
JournalChemistry of Materials
Volume35
Issue number19
Early online date19 Sept 2023
DOIs
Publication statusPublished - 10 Oct 2023

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