Electrochemical properties of Co-S/x wt.% AB_5 composite materials  

作　　者：LI JiaJia ZHAO XiangYu HU LiNa MA LiQun SHEN XiaoDong 

机构地区：[1]College of Materials Science and Engineering,Nanjing Tech University

出　　处：《Science China(Technological Sciences)》2015年第8期1355-1359,共5页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51201089);the Priority Academic Program Development of Jiangsu Higher Education Institutions of China(PAPD);Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20133221110009)

摘　　要：The Co-S/x wt.% AB5 （x=0, 10, 20, 30） composite materials were prepared by simply mixing Co-S material fabricated by hy- drothermal method and AB5 alloy. The structure and morphology of the composite materials were characterized by XRD and SEM, respectively. The electrochemical properties of the composite electrodes were studied by the galvanostatic charge, dis- charge test and electrochemical impedance spectroscopy. The results showed that the Co-S/20 wt.% AB5 composite electrode showed the highest discharge capacity and the best cycling stability. The existence of the AB5 alloy improved the electro- chemical activity of composite electrodes, reduced the electrochemical polarization resistances and promoted the electrochem- ical conversion reaction between Co and Co（OH）2. In order to improve the utilization rate of active materials, 0.0! mol/L Na2S203 was added into the electrolyte. The electrochemical properties of the composite electrode were significantly enhanced. After fifty cycles, the discharge capacity of the composite electrode increased from 407 to 481.7 mAh/g and the capacity reten- tion increased from 79.7% to 91.2%.

关 键 词：Co-S AB5 hydrogen storage alloy composite materials electrochemical properties 

分 类 号：TB33[一般工业技术—材料科学与工程]