CO_2资源化转化纳米碳材料对硫酸盐化铅盘电极的活化性能研究  

Activation Effect of Nano-Carbon Derived from CO_2 on Lead Electrode in Sulfuric Aqueous Solution

作　　者：宋宇桥 朱华[1] 赵光金[2] 吴文龙[2] 周寿斌 汪的华[1] 

机构地区：[1]武汉大学资源与环境科学学院,湖北武汉430072 [2]河南省电力公司电力科学研究院,河南郑州450052 [3]江苏华富储能新技术股份有限公司,江苏高邮225600

出　　处：《电化学》2016年第4期425-432,共8页Journal of Electrochemistry

基　　金：科技部国际科技合作专项(电网No.2015DFA90750);湖北省自然科学基金创新群体项目(No.2015CFA017);国家电网总部科研项目资助

摘　　要：负极板硫酸盐化是铅酸蓄电池早期容量下降、提前失效的主要原因之一.利用碳材料制备活化剂加入电池电解液中,可以有效减少或修复不可逆硫酸盐化现象.本文研究了一种新型高导电纳米碳材料—CO2高温熔盐电化学转化制备碳粉,对硫酸盐化铅盘电极的活化效果,结果表明,新型碳粉对于铅盘电极电量和电流效率的提升效果比乙炔黑和碳纳米管更显著,在一定浓度范围内对析氢无影响,碳粉的存在提高了电极活性物质间的导电性,并可在其表面吸附富集铅离子和提供还原位点,从而促进硫酸铅的溶解、抑制大颗粒硫酸盐晶体的产生,表明CO2高温熔盐资源化转化制备的碳粉作为一种新的铅蓄电池碳材料活化剂具有较好的发展潜力.Serious sulfation of the negative plate is one of the most popular reasons for the early failure of lead-acid battery. Addition of nano-carbon is proved to be effective for recovering the sulfated electrode and the property of the carbon material always plays an important role. In this work, a new kind of nano-carbon material with high electrical conductivity and good adsorption capability for heavy metal cations, which is electrochemically prepared from CO2 in molten carbonates, was tested as an activation ad ditive for the sulfated lead electrode by cyclic voltammetric measurements and scanning electron spectroscopy（SEM）. The results showed that the as-prepared carbon could effectively enhance the activity of the sulfated lead electrode, super to acid-treated acetylene black and carbon nanotubes at the same concentration. No serious hydrogen evolution took place when the concentration of carbon was not higher than 1 g·L-1. It was also found that the activation effect strongly depended on the concentration of carbon in the solution. Based on the test results and SEM analyses, a possible activation mechanism of the carbon is proposed. The adsorption of the carbon powder at the surface and interface of the Pb SO4 particles could improve the conductivity of the electrode, promote the dissolution of the sulfate crystals through the absorption of plumbous ions and provide more active sites for reduction and oxidation. However, too much adsorbed carbon would block the pathway of ions transportation within the porous electrode. The results also suggested that the carbon powder derived from CO2 could be a new kind of activator for the electrode of lead acid battery.

关 键 词：铅酸蓄电池 硫酸盐化 活化 碳材料 二氧化碳资源化 

分 类 号：TM912[电气工程—电力电子与电力传动]