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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%。
By etching metal foil as template, Ni-P alloy with micro-array structure was prepared by electroless plating. The microstructure and material composition of the obtained material were characterized by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction The effects of electroless plating temperature and plating time on the catalytic activity of hydrogen evolution were investigated by electrochemical methods. The results show that the Ni-P microarray prepared at 70 ℃ has the lowest hydrogen evolution overpotential and the current density of 15m A / cm2 is about 100mV lower than that of the bare Ni-P coating. At the same time, the highest exchange current The density is 13.53 × 10-6A / cm2, which is nearly one order of magnitude higher than that of the bare Ni-P coating. When the coating is applied at 70 ℃ for 4h, the coating with lower overpotential of hydrogen evolution and complete structure can be obtained without prolonging the performance. In order to directly measure the catalytic activity of the material, a hydrogen evolution test of photolysis was carried out in a double chamber cell. Ni-P microarray material showed good catalytic activity, hydrogen evolution rate than the smooth electrode increased by about 200%.