纳米ZnO改性锌电极的性能  

Electrochemical Performance of ZnO Nanoparticles Modified Zinc Electrode

作　　者：王华清[1] 周上祺[1] 陈昌国[2] 余丹梅[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]重庆大学化学化工学院,重庆400044

出　　处：《应用化学》2005年第1期99-102,共4页Chinese Journal of Applied Chemistry

摘　　要：以6.0mol/LKOH溶液中,研究了锌电极中添加不同质量分数和不同粒径的ZnO对电极电化学性能的影响。结果表明,在较慢的扫描速度(1mV/s)下,不同组成的锌电极循环伏安曲线峰形相差较大。对各电极循环伏安曲线峰电位及峰电流对比分析表明,添加质量分数为50%的纳米ZnO有效地改善了锌电极的结构,改进了电极反应的传质和传荷条件,使电极中电活性粒子具有合理的分布,因而显示出了良好的电化学性能,在25周和30周时放电容量仍有220mA·h/g和198mA·h/g。The electrochemical performances of zinc electrodes were investigated as the functions of ZnO size and mass fraction of Zn to ZnO in 6 0 mol/L KOH solutions. The peak shapes and peak current in the CV curves were found differed for zinc electrodes with different compositions at a scan rate of 1 mV/s. The zinc electrode containing 50%(mass fraction) ZnO nanoparticles exhibited better electrochemical behavior due to better distribution of the electroactive species on the surface of the electrode, and improvement of the electrode structure in favor of the transfer of reaction particles and ionic charges compared with the zinc electrode containing common ZnO. The discharge capacities of the zinc electrode containing 50%ZnO nanoparticles were 220 mA·h/g and 198 mA·h/g at 25th and 30th charge discharge cycles, respectively.

关 键 词：纳米ZnO 锌电极 循环可逆性 放电容量 

分 类 号：O646.2[理学—物理化学] TM912[理学—化学]