摘要
通过水热法成功合成Co3O4/Cu O复合物,并探索十六烷基三甲基溴化铵(CTAB)和聚乙烯吡咯烷酮(PVP)对其形貌和性能的影响。用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和氮气吸附-脱附测试表征其微观结构和表面形貌。采用循环伏安、恒流充放电和交流阻抗测试等方法研究样品的电化学性能。结果表明,多孔Co3O4/Cu O-CTAB纳米片具有最好的电化学性能,在电流密度1 A/g下的比容量达398 F/g,而在10 A/g时其比容量仍能保持90%。此外,该复合物具有很好的循环稳定性,在2000次循环后容量几乎没有衰减。
A promising Co3O4/Cu O composite electrode material was successfully synthesized through a facile hydrothermal and calcination process. Effects of the surfactants hexadecyltrimethyl ammonium bromide(CTAB) and polyvinylpyrrolidone(PVP) on the morphology and electrochemical performance of the composite were investigated. Powder X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and nitrogen adsorption-desorption experiment were employed to characterize the microstructures and morphologies of the composite. Meanwhile, the electrochemical performances of the samples were studied using cyclic voltammetry(CV), galvanostatic charge-discharge test and electrochemical impedance spectroscopy(EIS). The results show that the porous Co3O4/Cu O-CTAB nanoplates own the best performance and exhibits a high specific capacitance of 398 F/g at 1 A/g with almost 100% capacitance retention over 2000 cycles, and it retains 90% of capacitance at 10 A/g.
基金
Project(21471162)supported by the National Natural Science Foundation of China
Project(2014LY36)supported by the Science and Technology Project of Longyan City
China