Issue 1, 2023

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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
30 Sept. 2022
Accepted
25 Nov. 2022
First published
28 Nov. 2022

Nanoscale, 2023,15, 259-265

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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