石墨烯负载金属钌用于锂-空气电池的正极材料  

Composite of Graphene and Ruthenium for Cathode of Li-air Battery

作　　者：杨宁 张娜[1] 曹博凯 陈永[1] 

机构地区：[1]海南大学材料与化工学院,热带生物资源教育部重点实验室,热带岛屿资源先进材料教育部重点实验室,硅锆钛资源综合开发与利用海南省重点实验室,海口570228

出　　处：《材料导报》2016年第6期41-44,共4页Materials Reports

基　　金：国家自然科学基金(51162006,51362009);海南省国际科技合作专项(KJHZ2015-02);海南省重点项目(ZDXM2015118);中西部计划学科重点建设(ZXBJH-XK009)

摘　　要：通过溶液法制备钌/石墨烯(Ru/G)复合材料,用作锂-空气电池的正极材料。通过充放电测试、循环伏安(CV)和电化学阻抗(EIS)研究了锂-空气电池的电化学性能。结果表明:Ru/G复合材料作为锂-空气电池的正极材料,明显提高了氧化还原反应的催化活性,改善了电化学反应性能。在电流密度为500mA·g-1时,首次充放电比容量分别为13136mAh·g-1和13578mAh·g-1,充放电的过电位降低了约0.35V。当固定充放电比容量为1000mAh·g-1,采用恒流充放电模式,可稳定循环30次。Ruthenium nanoparticles were loaded on the graphene via solution method. The obtained ruthenium/ graphene （Ru/G） composite was used for a cathode of Li-air batteries. The electrochemical performance of Li-air batteries was characterized by charge-discharge test, cyclic voltammetry （CV） and electrochemical impedance （EIS）. The results demonstrated that Ru/G composite significantly increased the catalytic activity of redox reactions, and improved the performance of the electrochemical reaction, compared with pure graphene. At a current density of 500 mA·g^-1, the initial charge and discharge capacity was up to 13136 mAh·g^-1 and 13578 mAh·g^-1, respectively. When the capacity was limited to 1000 mAh·g^-1, the fabricated Li-air battery lasted for 30 galvanostatic charge-discharge cycles without the capacity decay.

关 键 词：石墨烯 金属钌 锂-空气电池 催化剂 过电位 

分 类 号：TM911.41[电气工程—电力电子与电力传动]