Electrocatalytic trends of different Cantor entropy alloys for alkaline and acidic hydrogen-evolution reactionsLjubec Božiček, Barbara (Avtor) Arah, Bor (Avtor) Kušter, Monika (Avtor) Naglič, Iztok (Avtor) Markoli, Boštjan (Avtor) Ponikvar-Svet, Maja (Avtor) Einfalt, Lara (Avtor) Čeh, Miran (Avtor) Alcantara Marinho, Belisa (Avtor) water-splitinghydrogen-binding energymedium-entropy alloyshigh-entropy alloysspillover effectMedium- and high-entropy alloys (MEAs and HEAs) are the basis of unique electrocatalysts for hydrogen-evolution reactions (HERs) due to their tunable chemical compositions and microstructures. Here, various Cantor MEAs (CoFeNi, CoFeNiMn, CoFeNiCr) and a HEA (CoFeNiMnCr) made up of affordable non-noble transitional metals with different structures (primary matrix and secondary phases, grain sizes, lattice parameters) were successfully synthesized with an inert-gas melting process. A close correlation was established between their physicochemical properties (elemental composition, microstructure, crystal structure) and the hydrogen-binding ability of the elements in the alloy on the electrocatalytic HER activity and stability in alkaline and acidic media. Advanced performances of electrocatalysts toward HERs were revealed in a specially designed electrochemical cell. Effectively identifying these electrocatalytic trends lays the groundwork for the strategic design of multi-component alloy electrocatalysts for practical HERs.Elsevier20242025-11-10 13:36:35Neznano24058Nizozemskasl© 2024 The Author(s).