电化学阶边精饰法制备钯镍合金纳米线的研究

运用连续恒电势三脉冲的电化学阶边精饰法在高定向石墨(HOPG)上制备钯镍合金纳米线阵列， 并研究了合金成分的影响因素. 结果表明，改变镀液组成可以调整钯镍合金成分，调整生长时间和生长电势来控制钯镍合金纳米线的直径. 用7 mmol?L^-1 PdCl2,3 mmo?L^-1 NiSO₄, 0.2 mol?L^-1 NH₄Cl，pH 8.5的混合溶液，控制脉冲电势-2.0 V形核0.2 s，在脉冲电势－0.4 V生长1 h，可以获得平均直径为200 nm, 长度约400 μm的钯镍合金纳米线阵列, 纳米线的合金成分中镍含量为12.4%(质量分数,w).

Pd-Ni Nanowires Prepared by Electrochemical Step-edge Decoration

The arrays of Pd-Ni nanowires were prepared on highly oriented pyrolytic graphite by electrochemical step-edge decoration under the control of successive potentiostatic triple-pulse. The affecting factors on the composition of Pd-Ni alloy were investigated. The experimental results showed that the alloy composition of palladium and nickel could be adjusted by changing the ratio of Ni²⁺ and Pd²⁺ concentrations. The diameters of nanowires were controlled by adjusting the growing time and the growing potential. In the mixture of 7 mmol?L^-1 PdCl₂， 3 mmol?L^-1 NiSO₄ and 0.2 mol?L^-1 NH₄Cl，at pH 8.5，the arrays of Pd-Ni alloy nanowires with mean diameter of 210 nm, length about 400 μm and composition of Ni mass fraction of 12.4% were synthesized with the nucleating pulse of -2.0 V, 0.2 s and growing pulse of -0.4 V, 1 h.