Electrocatalytic trends of different Cantor entropy alloys for alkaline and acidic hydrogen-evolution reactions

Ljubec Božiček, Barbara (author), Arah, Bor (author), Kušter, Monika (author), Naglič, Iztok (author), Markoli, Boštjan (author), Ponikvar-Svet, Maja (author), Einfalt, Lara (author), Čeh, Miran (author), Alcantara Marinho, Belisa (author)

Medium- 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.

• Language: English
• Keywords: water splitting, hydrogen-binding energy, medium-entropy alloys, high-entropy alloys, spillover effect
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: 7 str.
• Numbering: Vol. 41, art. 110876
• PID: 20.500.12556/RUL-164785
• UDC: 54
• ISSN on article: 2352-4928
• DOI: 10.1016/j.mtcomm.2024.110876
• COBISS.SI-ID: 214436867
• Publication date in RUL: 12.11.2024

Record is a part of a journal

• Title: Materials today communications
• Publisher: Elsevier
• ISSN: 2352-4928
• COBISS.SI-ID: 19385622

Licences

• License: CC BY-NC 4.0, Creative Commons Attribution-NonCommercial 4.0 International
• Link: http://creativecommons.org/licenses/by-nc/4.0/
• Description: A creative commons license that bans commercial use, but the users don’t have to license their derivative works on the same terms.

Secondary language

• Language: Slovenian
• Keywords: vodikova energija, cepitev vode, zlitine, entropija, elektrokataliza