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 MoS2@Ni 电极.当使用细小均匀的 MoS2 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 MoS2 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 MoS2 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,5 000 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.
Preparation of MoS2@Ni Electrode by Spark Plasma Sintering and Its Performance in Hydrogen Evolution Reaction
In order to solve the problem of complicated preparation steps and long period of hydrogen electrode during water decomposition,MoS2@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 MoS2 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 MoS2 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 MoS2 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.
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