Mo doping and Se vacancy engineering for boosting electrocatalytic water oxidation by regulating the electronic structure of self-supported Co9Se8@NiSe

Lin Tian; Zhenyang Chen; Tingjian Wang; Ming Cao; Xinhua Lu; Wenjing Cheng; Changchun He; Ju Wang; Zhao Li

doi:10.1039/D2NR05410H

Mo doping and Se vacancy engineering for boosting electrocatalytic water oxidation by regulating the electronic structure of self-supported Co₉Se₈@NiSe†

Lin Tian,

*^abc Zhenyang Chen,^a Tingjian Wang,^a Ming Cao,^a Xinhua Lu,^a Wenjing Cheng,^bc Changchun He,^a Ju Wang

^a and Zhao Li

*^a

Author affiliations

* Corresponding authors

^a School of Materials and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, PR China
E-mail: xzittl@xzit.edu.cn, xzitlz@xzit.edu.cn

^b University and College Key Lab of Natural Product Chemistry and Application in Xinjiang, School of Chemistry and Environmental Science, Yili Normal University, Yili 835000, China

^c Key Laboratory of Pollutant Chemistry and Environmental Treatment, School of Chemistry and Environmental Science, Yili Normal University, Yili 835000, China

Abstract

Oxygen evolution reactions (OERs) are regarded as the rate-determining step of electrocatalytic overall water splitting, which endow OER electrocatalysts with the advantages of high activity, low cost, good conductivity, and excellent stability. Herein, a facile H₂O₂-assisted etching method is proposed for the fabrication of Mo-doped ultrathin Co₉Se₈@NiSe/NF-X heterojunctions with rich Se vacancies to boost electrocatalytic water oxidation. After step-by-step electronic structure modulation by Mo doping and Se vacancy engineering, the self-standing Mo-Co₉Se₈@NiSe/NF-60 heterojunctions deliver a current density of 50 mA cm⁻² with an overpotential of 343 mV and a cell voltage of only 1.87 V at 50 mA cm⁻² for overall water splitting in 1.0 M KOH. Our study opens up the possibility of realizing step-by-step electronic structure modulation of nonprecious OER electrocatalysts via heteroatom doping and vacancy engineering.

This article is part of the themed collections: Nanoscale Most Popular 2023 Articles and 2024 Lunar New Year Collection

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Article information

DOI: https://doi.org/10.1039/D2NR05410H
Article type: Paper
Submitted: 30 Sep 2022
Accepted: 25 Nov 2022
First published: 28 Nov 2022

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Nanoscale, 2023,15, 259-265

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Mo doping and Se vacancy engineering for boosting electrocatalytic water oxidation by regulating the electronic structure of self-supported Co₉Se₈@NiSe

L. Tian, Z. Chen, T. Wang, M. Cao, X. Lu, W. Cheng, C. He, J. Wang and Z. Li, Nanoscale, 2023, 15, 259 DOI: 10.1039/D2NR05410H

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