Abstract:

The electrochemical deposition behavior of Pd-Ni bimetal on glassy carbon (GC) electrode was studied by means of cyclic voltammetry (CV) based on orthogonal experiments.The optimum preparation conditions of Pd-Ni/GC electrode were Ni²⁺=8.5 mmol·L^-1, Pd²⁺=3 mmol·L^-1, pH=7.0, J_k=15 mA·cm^-2, and T=30 min.The hydrogen adsorption peak on Pd-Ni/GC electrode of -24.83 mA was obtained at about -500 mV (vs Hg/Hg₂SO₄).Pd-Ni/PPy/GC electrode modified by polypyrrole film was prepared.CV results revealed that the hydrogen adsorption peak of -32.33 mA was obtained at about -500 mV (vs Hg/Hg₂SO₄), which was larger than that on Pd-Ni/GC electrode.Scanning electron microscope (SEM) images revealed that PPy film changed the deposition configuration of Pd-Ni particles evidently.The diameters of Pd-Ni microparticles were smaller and the dispersion degree was higher.

Key words:

Pd-Ni/GC电极, Pd-Ni/PPy/GC电极, 循环伏安

摘要：

通过电沉积法在玻碳板（GC）电极上负载钯镍双金属颗粒，并利用正交实验对其进行循环伏安（CV）研究，得到Pd-Ni/GC电极的最佳制备条件为：Ni²⁺=8.5 mmol·L^-1，Pd²⁺=3 mmol·L^-1，pH=7.0，J_k=15 mA·cm^-2，T=30 min。可以在-500 mV（以Hg/Hg₂SO₄为参比电极）左右获得-24.83 mA的氢吸附峰。用聚吡咯(PPy)修饰GC制备Pd-Ni/PPy/GC电极，CV结果表明，Pd-Ni/PPy/GC电极具有比Pd-Ni/GC电极更大的氢吸附峰值，可以在-500 mV（以Hg/Hg₂SO₄为参比电极）左右获得-32.33 mA的氢吸附峰。扫描电镜（SEM）分析表明，聚吡咯的修饰明显改变了Pd-Ni颗粒的沉积形态，使其沉积粒径更小，分散度更高。

关键词:

Pd-Ni/GC电极, Pd-Ni/PPy/GC电极, 循环伏安