20.500.12556/DiRROS-21102 Unveiling the potential of ▫$(CoFeNiMnCr)_3O_4$▫ high-entropy oxide synthesized from CoFeNiMnCr high-entropy alloy for efficient oxygen-evolution reaction Electrochemical water-splitting is a promising green technology for the production of hydrogen. One of the bottlenecks, however, is the oxygen evolution half-reaction (OER), which could be overcome with the development of a suitable electrocatalyst. Recently, non-noble metal, high-entropy oxides (HEO) have been investigated as potential OER electrocatalysts, but complex synthesis approaches that usually produce the material in powder form limit their wider utilization. Here, an innovative synthesis strategy of formulating a nanostructured (CoFeNiMnCr)3O4 HEO thin film on a CoFeNiMnCr high entropy alloy (HEA) using facile electrochemical and thermal treatment methods is presented. The CoFeNiMnCr HEA serves as exceptional support to be electrochemically treated in an ethylene glycol electrolyte with ammonium fluoride to form a rough and microporous structure with nanopits. The electrochemically treated CoFeNiMnCr HEA surface is more prone to oxidation during a low-temperature thermal treatment, leading to the growth of a spinel (CoFeNiMnCr)3O4 HEO thin film. The (CoFeNiMnCr)3O4 HEO exhibits a superior overpotential of 341 mV at 10 mA cm−2 and a Tafel slope of 50 mV dec−1 along with remarkable long-term stability in alkaline media. The excellent catalytic activity and stability for the OER can serve as a promising platform for the practical utilization of (CoFeNiMnCr)3O4 HEO. electrochemical water-spliting electrocatalysts true false true Springer Nature Link Nemčija Angleški jezik Ni določen © The Author(s), 2024 Neznano 2024-12-20 15:08:55 2024-12-20 15:08:55 2024-12-21 03:36:18 0000-00-00 00:00:00 2024 0 0 Nasl. z nasl. zaslona; Soavtorji: Jitka Hreščak, Monika Kušter, Janez Kovač, Iztok Naglič, Boštjan Markoli, Barbara Šetina Batič, Martin Šala, Sandra Drev, Živa Marinko, Miran Čeh, Belisa Alcantara Marinho; Opis vira z dne 14. 5. 2024; str. 9189-9207 iss. 21 Vol. 59 Jun. 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2024-06-01 54 1573-4803 10.1007/s10853-024-09710-5 195390211 RAZ_Ljubec_Bozicek_Barbara_2024.pdf RAZ_Ljubec_Bozicek_Barbara_2024.pdf 1 27A7C9224617BAAEB4531AEBFE322D59 122e8016ad2b7e9f4dda6735194db595e19541f60bc783591bb218475a3f1b97 252bb194-bee0-11ef-ba3f-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=29910 https://link.springer.com/article/10.1007/s10853-024-09710-5 1 f4b6be3a-bedb-11ef-ba3f-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=29909 Inštitut za kovinske materiale in tehnologije 0 0 0