The preparation of catalysts that possess both high stability and activity for electrolysis of water is a key step for the large-scale hydrogen production.Herein,the CoFe2O4 nanospheres were in-situ synthesized on the surface of the bimetallic nickel-copper foam(NCF).The structure and compo-sition of the material were characterized by X-ray diffraction(XRD)and scanning electron micro-scope(SEM).The catalytic performance of the material for the hydrogen evolution reaction(HER)in an alkaline environment was investigated using linear sweep voltammetry(LSV).The results show that the overpotential required for the HER to reach a current density of 10 mA×cm-2 is only 148 mV with a Tafel slope of 197 mV×dec-1.significantly outperforming bare NCF and single-metal control materials.Stability tests indicate that after 2 000 cycles of cyclic voltammetry scans,the LSV curve for the HER is essentially consistent with the original curve.Simultaneously,under a continu-ous electrolysis at a current density of 100 mA×cm-2 for 25 hours,the potential does not change signifi-cantly,indicating that the catalyst possesses good electrocatalytic stability.
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