银掺杂对二氧化锰空气电极性能的影响  

Effect of Ag doping on the properties of MnO_2 air electrode

作　　者：兰电 马正青[1] 罗双[1] LAN Dian;MA Zheng-qing;LUO Shuang(College of Material Science and Engineering,Central South University,Changsha Hunan 410083,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《电源技术》2018年第12期1850-1853,共4页Chinese Journal of Power Sources

基　　金：长沙市科技计划项目(kq1701081)

摘　　要：研究了活性碳表面沉积纳米银及其银掺杂的二氧化锰空气电极材料,采用扫描电子显微镜(SEM)观察电极材料的形貌;利用电化学方法测试电极材料的极化曲线、开路电位及铝-空气电池的放电性能。结果表明:化学还原法制备的纳米级银均匀、弥散分布在活性碳表面;掺杂少量纳米银的二氧化锰空气电极,随银含量的增加,阴极电流密度增大,空气电极极化减弱;当掺杂银含量为3.0%(质量分数)时,在4.5 mol/L NaOH+15 g/L Na_2S O_3碱性电解质中,二氧化锰空气电极的阴极电流密度达到185.92 m A/cm^2;1 m A/cm^2电流密度恒电流极化时,二氧化锰空气电极的稳定电位为0.61V,铝-空气电池放电电压为1.81 V。并探讨了银掺杂二氧化锰空气电极的催化机理。The nano-silver and its silver-doped MnO2 air electrode materials on the surface of activated carbon were studied.The morphology of the electrode material was observed by scanning electron microscopy(SEM).The polarization curves,open circuit potential and the discharge performance of the aluminum-air battery were measured by electrochemical method.The results showed that the nanoscale silver prepared by chemical reduction method was even and dispersed on the surface of activated carbon.Doped with a small amount of manganese dioxide nanosilver air electrode,with increasing silver content,the cathode current density was increased,and the air electrode polarization weakened.When the silver content was 3.0%wt,the cathode current density of manganese dioxide air electrode reached 185.92 mA/cm2 in 4.5 mol/L NaOH+15 g/L Na2SnO3 alkaline electrolyte;when the constant-current polarization current density was 1 mA/cm2,the manganese dioxide air electrode stable potential was 0.61 V,and aluminum-air battery discharge voltage was 1.81 V.The catalytic mechanism of silver-doped manganese dioxide air electrode was also discussed.

关 键 词：金属-空气电池 二氧化锰 纳米银 掺杂 空气电极 

分 类 号：TM911[电气工程—电力电子与电力传动]