Fabrication of nanocrystalline high-entropy oxide CoNiFeCrMnOx thin film electrodes by dip-coating for oxygen evolution electrocatalysis

Qingyang Wu; Achim Alkemper; Stefan Lauterbach; Jan P. Hofmann; Marcus Einert

doi:10.1039/D4YA00026A

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Fabrication of nanocrystalline high-entropy oxide CoNiFeCrMnO_x thin film electrodes by dip-coating for oxygen evolution electrocatalysis†

Qingyang Wu,^a Achim Alkemper,

^a Stefan Lauterbach,^b Jan P. Hofmann

^a and Marcus Einert

*^a

Author affiliations

* Corresponding authors

^a Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt, Otto-Berndt-Strasse 3, 64287 Darmstadt, Germany
E-mail: meinert@surface.tu-darmstadt.de

^b Institute for Applied Geosciences, Geomaterial Science, Technical University of Darmstadt, Schnittspahnstrasse 9, 64287 Darmstadt, Germany

Abstract

The variation of calcination conditions allows for adjusting the oxidation states and coordination sites of near-surface elements in sol–gel-derived high-entropy oxides. Optimized synthesis conditions resulted in fabrication of nanocrystalline CoNiFeCrMnO_x thin films with 1–2 nm pores, showing low OER overpotentials of 258 mV VS. RHE at 10 mA cm⁻².

This article is part of the themed collections: Research advancing UN SDG 13: Climate Action, Research advancing UN SDG 7: Affordable and clean energy and Research advancing UN SDG 12: Responsible consumption and production

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Article information

DOI: https://doi.org/10.1039/D4YA00026A
Article type: Communication
Submitted: 13 Jan 2024
Accepted: 17 Mar 2024
First published: 25 Mar 2024
This article is Open Access

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Energy Adv., 2024,3, 765-773

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Fabrication of nanocrystalline high-entropy oxide CoNiFeCrMnO_x thin film electrodes by dip-coating for oxygen evolution electrocatalysis

Q. Wu, A. Alkemper, S. Lauterbach, J. P. Hofmann and M. Einert, Energy Adv., 2024, 3, 765 DOI: 10.1039/D4YA00026A

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