ZIF-67 derived Co3O4/C for electrocatalytic hydrogen evolution
In view of the development of high efficiency electrocatalysts for hydrogen evolution from water splitting,cobalt metal-organic framework(MOF)has attracted extensive attention due to its special composition,structure and function.In this work,ZIF-67 prepared by solvothermal method was used as the precursor to prepare MOF-74-H with hollow structure and Co3O4/C with porous carbon skeleton.SEM,TEM,FT-IR,XRD,TG and XPS were employed to characterize prepared samples,and the effects of various framework structures on electrocatalysts'hydrogen evolution reaction were investigated.When Co3O4/C was applied for electrocatalytic hydrogen evolution in acidic and alkaline solution respectively,the corresponding overpotentials are 96.3 and 158.0 mV under the current density reached 10 mA/cm2,and the Tafel slopes are 37.6 and 57.0 mV/dec.Compared with ZIF-67 and MOF-74-H,Co3O4/C shows better performance in promoting electrocatalytic hydrogen evolution in both acidic and alkaline media.Furthermore,there is no obvious change in the overpotential value of Co3O4/C during cyclic electrochemical hydrogen evolution process,indicating that Co3O4/C exhibits an excellent electrochemical stability.
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