电化学阶边精饰法制备钯镍合金纳米线的研究

Pd-Ni Nanowires Prepared by Electrochemical Step-edge Decoration

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7mmo·lL-1PdCl2,3mmo·L-1NiSO4,0.2mo·lL-1NH4Cl,pH8.5的混合溶液,控制脉冲电势-2.0V形核0.2s,在脉冲电势-0.4V生长1h,可以获得平均直径为200nm,长度约400μm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).

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 center dot L-1 PdCl2, 3 mmol center dot L-1 NiSO4 and 0.2 mol center dot L-1 NH4Cl, at pH 8.5, the arrays of Pd-Ni alloy nanowires with mean diameter of 210 nm, length about 400 mu m 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.