蚀刻金属铝箔覆型制备Ni-P微阵列材料及析氢电催化性能研究

Study on Preparation of Ni-P Micro-Arrays Material with Etched Porous Aluminum Template and Its Electrocatalytic Performance

以蚀刻金属铝箔为模板,用化学镀制备了具有微米阵列结构的Ni-P合金材料,使用扫描电镜、能量散射谱及X-射线衍射等表征手段对所得材料的微观形貌与物质组成进行了分析,并通过电化学方法研究了化学镀温度、施镀时间对材料析氢催化活性的影响。结果表明,70℃制得的Ni-P微阵列材料作电极其析氢过电位最小,电流密度为15m A/cm2时比光面Ni-P镀层下降了约100m V;同时表现出最高的交换电流密度13.53×10-6A/cm2,高出光面Ni-P镀层近1个数量级;70℃施镀4h能够得到析氢过电位较低且结构完整的镀层,延长镀时没有继续提升其性能。为直观衡量材料的催化活性,在双室槽中进行了光解水析氢测试。Ni-P微阵列材料表现出良好的催化活性,析氢速率较光面电极上升约200%。

Ni-P micro-arrays material was fabricated by electroless plating method with etched porous aluminum template. The microstructure and elemental composition of the material were analyzed by SEM,EDS and XRD.Electrochemical measurements were performed to study the effect of plating temperature and time on the hydrogen evolution over-potential of Ni-P micro-arrays electrodes. The results showed that Ni-P micro-arrays electrode fabricated at 70℃ exhibits the highest electrocatalytic activity for hydrogen evolution reaction,and the over-potential was reduced by 100 m V compared with the smooth Ni-P electrodes at 15 m A / cm2. Its exchange current density reached to 13. 53 ×10- 6A / cm2 which is about 10 times of the smooth group. Ni-P micro-arrays electrode has already formed the array structures completely after fabricated at 70℃ for 4h,it exhibits a low over-potential but no longer benefited from increasing time further. To characterize the catalytic performance of obtained coatings intuitively,photocatalytic water splitting experiments were performed in a two-compartment photoelectrochemical cell. As the cathode,Ni-P microarrays electrode shows a high hydrogen production rate which is about 200% faster than that of the smooth group.