Cu掺杂WN松枝状自支撑纳米阵列的制备及其碱性析氢性能的研究OACSTPCD

Using ammonium metatungstate and copper acetate as raw materials,the precursors with different morphology were synthesized by a simple hydrothermal method by controlling the doping ratio.Then,combined with high temperature annealing method,the in-situ growth of Cu-WN-5∶1 was successfully realized on carbon paper.The morphology and structure of the samples were characterized by SEM,TEM,XRD and XPS,and then the hydrogen evolution performance of the catalyst was evaluated by electrochemical testing methods.The results show that the doping ratio of W and Cu(n(W)/n(Cu))has a significant effect on the hydrogen evolution performance of the catalyst,in which the optimal hydrogen precipitation activity is achieved when n(W)/n(Cu)is 5∶1.The successful doping of Cu increases the number of active sites by changing the electronic structure of WN,accelerates the charge transfer rate in the catalytic process,which in turn improves the HER activity of the material.The required overpotential of Cu-WN-5∶1 at 1.0 mol/L KOH with a current density of 10 mA/cm2 is 195 mV,and the Tafel slope is 192 mV/dec,which indicates that Cu-WN-5∶1 has a fast kinetic rate of electrochemical hydrogen precipitation reaction;the material has been continuously reacted for 36 h under the condition of 1.0 mol/L KOH,and it exhibits excellent long-term stability.