Study on collaborative strategy between Fe3+ and Ni-based metal-organic frameworks for boosting electrocatalytic oxygen evolution
The metal-organic framework materials(phen-Ni)were synthesized by solvothermal method,and then Fe@phen-Ni electrocatalys were prepared by doping heterometallic Fe3+.The morphology,crystal structure and chemical composition of Fe@phen-Ni were characterized by X-ray single crystal diffractometer,scanning electron microscope(SEM),transmis-sion electron microscope(TEM)and X-ray photoelectron spectrometer(XPS).The electrochemical oxygen evolution reac-tion(OER)activity of Fe@phen-Ni was investigated by linear sweep voltammetry(LSV)and electrochemical impedance spectroscopy(EIS).The results exhibited that Fe@phen-Ni had more excellent electrocatalytic performance with an overpo-tential of 333 mV at the current density of 10 mA/cm2 when compared with that of phen-Ni.The improvement could be at-tributed to the two factors.The introduction of Fe3+ increased the active site of the electrocatalyst.The synergistic action of Fe3+ and Ni2+ promoted the electron transfer.This work not only confirmed that doping of Fe3+ was beneficial to improve the electrocatalytic oxygen-evolution activity,but also provided a new idea for the preparation of electrocatalytic OER catalysts based on metal-organic frame materials.
metal-organic frameworkselectrocatalysisoxygen evolution reactionnonprecious metal electrocatalyst
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