脉冲镀Ni-Mo-Co合金镀层及其析氢性能

采用脉冲电镀法制备了Ni-Mo-Co合金镀层,考察了电镀条件对Ni-Mo-Co合金镀层的组成、表观形貌及析氢性能的影响.研究表明:随着镀液中钴盐浓度提高,镀层中的Mo含量逐渐降低,Co含量逐渐升高.钴盐质量浓度达到81 g/L时,镀层中各元素含量趋于稳定,该条件下所得Ni-Mo-Co合金镀层均匀致密且析氢性能最佳;Mo质量分数在40%左右时,Co含量越高,镀层的非晶态程度越高,具有更好的催化活性(80℃,η200=56 m V).经长时间电解后,镀层表面结构存在由非晶态向晶态转化的趋势.

Catalytic Property of Ni-Mo-Co Alloy Coating Prepared by Pulse Plating

The Ni-Mo-Co alloy coating was prepared by pulse plating process. The effects of different electrodeposition conditions on the composition， apparent morphology and hydrogen evolution reaction (HER) activity of the Ni-Mo-Co coating were investigated. The results showed that with the increasing addition of cobalt salt， the cobalt content in the coating increased and the molybdenum content decreased. When the concentration of cobalt salt was up to 81 g/L， the content of elements became less changeable. Moreover， the Ni-Mo-Co coating appeared to be a uniform and dense layer and the corresponding HER overpotential decreased to the minimum value. With the Mo content of 40 wt%， the degree of amorphous structure and the catalytic activity (80℃，η₂₀₀=56mV) of the Ni-Mo-Co coating increased with increasing of the Co content. After galvanostatic electrolysis， the bubble phenomenon happened， which indicated a poor stability.