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Updated: Jan 28, 2026

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Published on: July 3, 2025
Grafting Cobalt Diselenide on Defective Graphene for Enhanced Oxygen Evolution Reaction
Xin Wang1, Linzhou Zhuang2, Tianwei He3
1Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, CAS Centre for Excellence in Nanoscience, Hefei Science Centre of CAS, University of Science and Technology of China, Hefei 230026, China; School of Natural Sciences and Queensland, Micro- and Nanotechnology Centre, Griffith University, Nathan Campus, Brisbane 4111, Australia.
Abstract:
Cobalt diselenide (CoSe2) has been demonstrated to be an efficient and economic electrocatalyst for oxygen evolution reaction (OER) both experimentally and theoretically. However, the catalytic performance of up-to-now reported CoSe2-based OER catalysts is still far below commercial expectation. Herein, we report a hybrid catalyst consisting of CoSe2 nanosheets grafted on defective graphene (DG). This catalyst exhibits a largely enhanced OER activity and robust stability in alkaline solution (overpotential at 10 mA cm-2: 270 mV; Tafel plots: 64 mV dec-1). Both experimental evidence and density functional theory calculations reveal that the outstanding OER performance of this hybrid catalyst can be attributed to the synergetic effect of exposed cobalt atoms and carbon defects (electron transfer from CoSe2 layer to defect sites at DG). Our results suggest a promising way for the development of highly efficient and low-cost OER catalysts based on transition metal dichalcogenides.
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