20.500.12556/RUL-158419 Unveiling the potential of (CoFeNiMnCr)$_3$O$_4$ 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)$_3$O$_4$ 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)$_3$O$_4$ HEO thin film. The (CoFeNiMnCr)$_3$O$_4$ 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)$_3$O$_4$ HEO. electrochemical water-spliting electrocatalysts nanostrukturni materiali kataliza elektrokemija true false true Angleški jezik Slovenski jezik Članek v reviji 2024-06-07 12:00:26 2024-06-07 12:00:29 2024-06-26 03:42:35 0000-00-00 00:00:00 2024 0 0 Str. 9189–9207 iss. 21 Vol. 59 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 54 1573-4803 10.1007/s10853-024-09710-5 195390211 s10853-024-09710-5.pdf s10853-024-09710-5.pdf 1 81EB2A69E325FDF685C8BE4CD1C41FDF afa6e24c396b88818199243b9af247c18a7ff7828808b1f9ddc1b17761883963 03c0ad94-24b5-11ef-947b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=186019 https://link.springer.com/article/10.1007/s10853-024-09710-5 1 c4a93ac1-24b4-11ef-947b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=186018 Naravoslovnotehniška fakulteta 0 0 0