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500 mA·g-1时,首次充放电比容量分别为13136 mAh·g-1和13578 mAh·g-1,充放电的过电位降低了约0.35 V.当固定充放电比容量为1000 mAh·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 bat-teries 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 im-proved 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.
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