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

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.