用于析氢的纳米晶Ni-Mo-Co合金电极的制备及其电催化活性

Preparation and electrocatalytic activity of nanocrystalline Ni-Mo-Co alloy electrode for hydrogen evolution.

作者信息

Xu Lijian, Du Jingjing, Chen Baizhen

机构信息

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, PR China.

出版信息

J Nanosci Nanotechnol. 2013 Mar;13(3):2016-20. doi: 10.1166/jnn.2013.7137.

DOI:10.1166/jnn.2013.7137

PMID:23755641

Abstract

Ni-Mo-Co alloy electrodes were prepared by electrodeposition technique with citric acid as a complexing agent. The influence of the main technical parameters such as the concentration of CoSO4 7H2O, the current density and the bath temperature on the component content in the Ni-Mo-Co alloy electrode were investigated by electron dispersive spectrometer (EDS), the microstructure and surface morphology of Ni-Mo-Co alloy electrodes were characterized by employing X-ray diffractometer (XRD) and scanning electron microscope (SEM), and the electrocatalytic activity of Ni-Mo-Co alloy electrode for hydrogen evolution was investigated by the method of the cathode polarization curves. The results showed that the excellent Ni-Mo-Co alloy electrode with 41.39 wt% Ni, 53.82 wt% Mo and 4.79 wt% Co was obtained when the concentration of CoSO4 x 7H2O was 8 g/L, the current density was 12 A/dm2 and the bath temperature was 25 degrees C. The mircostructure of the Ni-Mo-Co alloy was nanocrystalline and the average grain size was about 25 nm by calculating using Scherrer Equation. The electrocatalytic activity of Ni-Mo-Co alloy electrode for hydrogen evolution was better than that of Ni-Mo alloy electrode.

摘要

采用电沉积技术，以柠檬酸为络合剂制备了Ni-Mo-Co合金电极。通过电子能谱仪（EDS）研究了CoSO₄·7H₂O浓度、电流密度和镀液温度等主要工艺参数对Ni-Mo-Co合金电极成分含量的影响，采用X射线衍射仪（XRD）和扫描电子显微镜（SEM）对Ni-Mo-Co合金电极的微观结构和表面形貌进行了表征，并通过阴极极化曲线法研究了Ni-Mo-Co合金电极析氢的电催化活性。结果表明，当CoSO₄·7H₂O浓度为8 g/L、电流密度为12 A/dm²、镀液温度为25℃时，可获得含41.39 wt% Ni、53.82 wt% Mo和4.79 wt% Co的优良Ni-Mo-Co合金电极。利用谢乐方程计算得出，Ni-Mo-Co合金的微观结构为纳米晶，平均晶粒尺寸约为25 nm。Ni-Mo-Co合金电极析氢的电催化活性优于Ni-Mo合金电极。