摘要
利用线性电位扫描、恒电位阶跃、交流伏安、交流阻抗等方法研究了Pb在硫酸浓度为39%的SiO2胶体电解液中的电化学行为。结果表明:与硫酸电解液相比,SiO2含量为7%(质量分数)的胶体电解液在纯Pb表面的析氢电位负移187 mV,析氢交换电流密度降低89.7%;在铅的氧化物表面的析氧电位正移17 mV,析氧交换电流密度降低34.5%。同时Pb在SiO2含量为7%的胶体电解液中能够形成一层高阻抗可逆性良好的薄而致密的氧化膜。
The electrochemical behavior of lead in the fumed silica gelled electrolyte with 39 % H2SO4solution was studied by linear potential scan, constant potential steps, AC voltammetry and AC impedance. The results showed that compared with sulfuric acid electrolyte, the hydrogen evolution potential of 7 % fumed silica gelled electrolyte on the surface of pure lead negatively shifts 187 mV, and the hydrogen evolution exchange current density reduces by89.7%;the oxygen evolution potential on the surface of lead oxygen positively shifts17 mV, and the oxygen evolution exchange current density reduces by 34.5%. At the same time, the lead could form a layer of high impedance, good reversibility, thin and dense oxide film in the 7 wt% fumed silica gelled electrolyte.
出处
《电源技术》
CAS
CSCD
北大核心
2014年第5期867-870,共4页
Chinese Journal of Power Sources