放电等离子烧结制备MoS_(2)@Ni电极及其析氢反应性能

Preparation of MoS_(2)@Ni Electrode by Spark Plasma Sintering and Its Performance in Hydrogen Evolution Reaction

为了解决水分解制氢电极制备步骤复杂和周期长的问题,以镍粉和不同类型硫化钼粉末作为原始材料,采用一步放电等离子烧结工艺制备出MoS_(2)@Ni电极。当使用细小均匀的MoS_(2)粉末和镍粉烧结时,0.03HS@C-Ni电极在50 mA cm^(-2)、100 mA cm^(-2)和150 mA cm^(-2)电流密度下过电位仅为251 mV、322 mV和379 mV。而当使用商用大块的MoS_(2)粉末和镍粉烧结时,0.03C@C-Ni电极在50 mA cm^(-2)、100 mA cm^(-2)和150 mA·cm^(-2)的电流密度下过电位分别为425 mV、488 mV和542 mV,说明使用细小均匀的MoS_(2)粉末和镍粉烧结时电极的催化性能好。对0.03HS@C-Ni电极进行循环稳定性和持久性测试可知,5000循环前后,电极的极化曲线几乎没有任何变化,电极能在约130 mA·cm^(-2)的电流密度下稳定运行超过130 h。

In order to solve the problem of complicated preparation steps and long period of hydrogen electrode during water decomposition,MoS_(2)@Ni electrode was prepared by one-step spark plasma sintering process via nickel powder and different types of molybdenum sulfide powder as raw materials.When fine and uniform MoS_(2) powder and nickel powder were used,the overpotentials of the 0.03HS@C-Ni electrode were only 251 mV,322 mV,and 379 mV at current densities of 50 mA·cm^(-2),100 mA·cm^(-2) and 150 mA·cm^(-2),respectively,whereas the corresponding 0.03C@C-Ni electrodes with commercial MoS_(2) had overpotentials of 425 mV,488 mV,and 542 mV at current densities of 50 mA·cm^(-2),100 mA·cm^(-2) and 150 mA·cm^(-2),respectively,proving the catalytic performance of the electrode was good when fine and uniform MoS_(2) powder and nickel powder ware used.The stability and durability of 0.03HS@C-Ni electrode were tested.After 5000 cycles,the polarization curve of the electrode hardly changed.Even at a current density of 130 mA·cm^(-2),the electrode can work stably for more than 130 h.