硫酸溶液中Eu^(3+)对铅锑合金电极性能的影响

The influence of Eu^(3+) in sulfuric acid solution on the performance of the lead-antimony alloy electrode

采用线性电势扫描伏安法、循环伏安法、计时电势法、交流阻抗法研究了不同铕离子加入量的硫酸溶液中铅锑合金电极的电化学特性。实验结果表明:在硫酸溶液中添加铕离子后,改善了Pb与PbSO4间转化反应的可逆性;铕离子的存在提高了铅锑合金电极的析氢量;抑制了铅锑合金电极上氧化膜中高电阻的PbOn的生成,提高了氧化膜的导电性;阻碍了钝化现象的发生。铅锑合金在添加铕离子的硫酸溶液中的电化学特性与稀土-铅锑合金在硫酸溶液中的规律相同。

The influence of europium ion in sulfuric acid solution on the electrochemical performance of the lead-antimony alloy electrode was studied by linear sweep voltammetry,cyclic voltammetry,chronoptentiometry and AC impedance method.The experimental results showed that the addition of europium ion in sulfuric acid could effectively improve the reversibility of the transfer reaction of Pb/PbSO4 and the over potential of hydrogen evolution reaction on the electrode in the existence of europium ion at the same time the growth of PbOn compounds was inhibited in the film of the lead-antimony alloy,indicating that the conductivity of the film was increased,while the passivation of electrode was prevented.The effect of the addition of europium ion in sulfuric acid solution on the characteristics was the same as that the addition of europium in the lead-antimony alloy to form europium-lead alloy in sulfuric acid solution.