摘要
用循环伏安法研究了ＰｂＣＯ３ 粉末微电极转化为ＰｂＳＯ４ 电极的活化方法和条件．发现在２ ～２－５ ｍｏｌ／ＬＨ２ＳＯ４ 溶液中由ＰｂＣＯ３ 转化成ＰｂＯ２／ＰｂＳＯ４ 和ＰｂＳＯ４／Ｐｂ 电极时，以不对称交变讯号活化（ 化成） 后，其循环伏安性能与由球磨机生产的ＰｂＯ 粉所制得的相应电极性能相近．对于负极，在含有乙炔黑胶体的Ｈ２ＳＯ４ 溶液中化成，由于碳胶粒在ＰｂＳＯ４ 晶体上的吸附，阻止了充放电过程中电极材料的收缩，同时增加了电极的导电性。
Lead carbonate which was an intermediate product in lead hydrometallurgy without pollution of lead vapor and sulfur dioxide was selected as electrode material of lead_acid batteries. In the present work,the performances of PbO 2/PbSO 4 or PbSO 4/Pb electrode transformed from PbCO 3 have been investigated by powder microelectrode technique combined with cyclic voltammetry.The results show that the CV characteristics of either negative or positive electrode prepared from PbCO 3 is as good as that of both electrodes made from lead oxide produced by mill machine,when a powder microelectrode with PbCO 3 transformed into PbSO 4 in 1.0 mol/L H 2SO 4 solution,and then activated to form Pb or PbO 2 using an unsymmetrical interchangeable signal( Q a/ Q c or Q c/ Q a being 0.2～0.4) in 2.0～2.5 mol/L H 2SO 4 solution.Furthermore,comparing the negative electrode activated in 2.5 mol/L H 2SO 4 solution containing 4% carbon colloid with one activated in the same H 2SO 4 solution concentration without ABC,the cyclic voltammetric characteristics of the former has been obviously improved.It is possible that the carbon colloid particles can be adsorbed on PbSO 4 crystals,which could increase the conductivity and reduce the shrinking of the electrode
出处
《电化学》
CAS
CSCD
1999年第4期437-442,共6页
Journal of Electrochemistry
基金
国家自然科学基金
关键词
碳酸铅
铅酸蓄电池
粉末微电极
活化
电极
Lead carbonate, Lead_acid battery, Powder microelectrode, Activation
