钼-钴-钒多金属复合材料设计及碱性电解水制氢性能OA

In order to prepare an efficient alkaline water electrolysis catalyst,a water bath co-precipitation method was used to acquire cobalt-vanadium bimetallic oxide substrate reacted at 80℃for 4 h,and then the molybdenum-bearing compounds were loaded on this substrate to form molybdenum-cobalt-vanadium polymetallic composite Co2V2O7@MoS2 under the condition of 200 ℃ for 8 h.Based on results of the micro structure and phase analysis of the composite material,the morphology of Co2V2O7 substrate is hexagonal flake and that of the loading MoS2 is nano-flake which has an amorphous structurewere discovered.Results of the electrochemical test disclosed that the molybdenum-cobalt-vanadium polymetallic composite Co2V2O7@MoS2 exhibits an excellent electrocatalytic activity in the oxygen evolution reaction.It requires an overpotential of 241 mV to drive a current density of 10 mA/cm2,increasing by 29.1％and 22.8％efficiency over the individual component of Co2V2O7 and MoS2,respectively.In addition,the overpotential of Co2V2O7@MoS2-8 decreased by 3.8％after a long-term electrolysis of 80 h with a constant current density,indicating the composite materials possess a great long-life cycle stability.The improved catalytic activity of Co2V2O7@MoS2 is correlated with its interface structure.Both the abundant internal microporous channels and interfacial heterojunction are conductive to the rapid transfer of interfacial electrons,and further accelerate the kinetic process of alkaline water electrolysis.