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Mo doping and Se vacancy engineering for boosting electrocatalytic water oxidation by regulating the electronic structure of self-supported CoSe@NiSe. | LitMetric
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 HO-assisted etching method is proposed for the fabrication of Mo-doped ultrathin CoSe@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-CoSe@NiSe/NF-60 heterojunctions deliver a current density of 50 mA cm with an overpotential of 343 mV and a cell voltage of only 1.87 V at 50 mA cm 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 heteroatom doping and vacancy engineering.
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