Unveiling the potential of (CoFeNiMnCr)$_3$O$_4$ high-entropy oxide synthesized from CoFeNiMnCr high-entropy alloy for efficient oxygen-evolution reaction

Ljubec Božiček, Barbara (avtor), Hreščak, Jitka (avtor), Kušter, Monika (avtor), Kovač, Janez (avtor), Naglič, Iztok (avtor), Markoli, Boštjan (avtor), Šetina Batič, Barbara (avtor), Šala, Martin (avtor), Drev, Sandra (avtor), Marinko, Živa (avtor), Čeh, Miran (avtor), Alcantara Marinho, Belisa (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: electrochemical water-spliting, electrocatalysts
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: NTF - Naravoslovnotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2024
• Št. strani: Str. 9189–9207
• Številčenje: Vol. 59, iss. 21
• PID: 20.500.12556/RUL-158419
• UDK: 54
• ISSN pri članku: 1573-4803
• DOI: 10.1007/s10853-024-09710-5
• COBISS.SI-ID: 195390211
• Datum objave v RUL: 07.06.2024

Gradivo je del revije

• Naslov: Journal of materials science
• Skrajšan naslov: J. mater. sci.
• Založnik: Springer Nature
• ISSN: 1573-4803
• COBISS.SI-ID: 513194009

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: nanostrukturni materiali, kataliza, elektrokemija