University of Oulu

Y. Sun, Y. Xia, L. Kuai, H. Sun, W. Cao, M. Huttula, A.-P. Honkanen, M. Viljanen, S. Huotari, B. Geng, ChemSusChem 2019, 12, 2564. https://doi.org/10.1002/cssc.201900831

Defect‐driven enhancement of electrochemical oxygen evolution on Fe–Co–Al ternary hydroxides

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Author: Sun, Yixuan1; Xia, Yuanyuan1; Kuai, Long1;
Organizations: 1College of Chemistry and Materials Science, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, The Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, Anhui Normal University NO.189 South Jiuhua Road, Wuhu, 241002 (P. R. China)
2Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
3Department of Physics, University of Helsinki, PO Box 64, FI-00014 Helsinki, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2019091728455
Language: English
Published: John Wiley & Sons, 2019
Publish Date: 2020-04-24
Description:

Abstract

Efficient, abundant and low‐cost catalysts for the oxygen evolution reaction (OER) are required for energy conversion and storage. In this study, a doping–etching route has been developed to access defect rich Fe–Co–Al (Fe–Co–Al‐AE) ternary hydroxide nanosheets for superior electrochemical oxygen evolution. After partial etching of Al, ultrathin Fe3Co2Al2‐AE electrocatalysts with a rich pore structure are obtained with a shift of the cobalt valence state towards higher valence (Co2+→Co3+), along with a substantial improvement in the catalytic performance. Fe3Co2Al2‐AE shows a notably lower overpotential of only 284 mV at a current density of 10 mA cm−2 and double the OER mass activity of the etching‐free Fe3Co2Al2 with an overpotential of 350 mV. Density functional theory shows the leaching of Al changes the rate‐determining step of the OER from conversion of *OOH into O2 on Fe3Co2Al2 to formation of OOH from *O on the Al‐defective catalysts. This work demonstrates an effective route to design and synthesize transition metal electrocatalysts and provides a promising alternative for the further development of oxygen evolution catalysts.

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Series: ChemSusChem
ISSN: 1864-5631
ISSN-E: 1864-564X
ISSN-L: 1864-5631
Volume: 12
Issue: 12
Pages: 2564 - 2569
DOI: 10.1002/cssc.201900831
OADOI: https://oadoi.org/10.1002/cssc.201900831
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
116 Chemical sciences
Subjects:
Funding: This work was supported by the National Natural Science Foundation of China (21871005, 21471006), the Academy of Finland (1295696, 311934), the Program for Innovative Research Team of Anhui Education Committee
Copyright information: © 2019 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Y. Sun, Y. Xia, L. Kuai, H. Sun, W. Cao, M. Huttula, A.-P. Honkanen, M. Viljanen, S. Huotari, B. Geng, ChemSusChem 2019, 12, 2564, which has been published in final form at https://doi.org/10.1002/cssc.201900831. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."