离子膜电解槽用纳米Ni-Mo合金阴极的制备及其催化析氢性能

采用正交实验法确定了电沉积N i-Mo合金的最佳工艺。通过测试N i-Mo合金在模拟氯碱工业离子膜电解槽工艺条件下的阴极极化曲线,考察了N i-Mo合金电极的催化析氢性能。结果表明,当电流密度为3.0kA/m2时,N i-Mo合金电极的析氢过电位较镀镍电极降低约400 mV,反应活化能仅为24.89 kJ/mol。扫描电镜观察到N i-Mo合金电极表面微观粗糙,X射线衍射测试结果表明,所制备的N i-Mo合金为纳米晶结构,平均晶粒尺寸为2.25 nm。

The preparation of nano-Ni-Mo alloy cathodes for ion-exchange membrane electrolyzers and their catalytic hydrogen evolution property

The optimum process for Ni-Mo alloy electrodeposition was found by orthogonal experiments.The catalytic hydrogen evolution property of the Ni-Mo alloy electrodes were investigated by measuring their cathodic polarization curves under the simulated process conditions of chlor-alkali ion-exchange membrane electrolyzers.The results showed that when the current density was 3.0 kA/m~2 the hydrogen evolution overpotential of the Ni-Mo alloy was about 400 mV lower than that of nickel plating electrode,and the reaction activation energy was as low as 24.89 kJ/mol.Scanning electron microscrope showed that the surface of Ni-Mo alloy electrodes was microrough.The X-ray diffraction results that the prepared Ni-Mo alloy had nanocrystalline structure with the average particle size of 2.25 nm.