摘要
采用溶剂热法制备了不同质量比的石墨烯/Bi_2O_3复合材料。经X射线衍射(XRD)、场发射扫描电镜(FESEM)等表征了产物的组成、结构和形貌;通过循环伏安、恒电流充放电和交流阻抗对复合材料的电化学性能进行了研究。结果表明:所合成石墨烯/Bi_2O_3复合材料分散均匀,电化学性能优异,内阻较小。当氧化石墨与Bi_2O_3质量比为1∶1时,电化学性能最佳;在1 A/g电流密度下,比电容达到了753 F/g;10 A/g电流密度下,电容保持率高达87%,具有良好的倍率性;在2 A/g电流密度下经1 000次充放电循环,比电容保持率为71%。
The graphene/Bi2O3 composites with different mass ratios were prepared by a simple solvothermal method. The composition, structure and morphology of the sample were systematically characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The electrochemical properties were investigated by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. The results show the graphene/Bi2O3 composite is synthesized by this method, and it is with uniform dispersion, excellent electrochemical performance and small internal resistance. Electrochemical test results show that the material prepared at mass rario with 1∶1 gets the best specific capacitance as high as 753 F/g at the current density of 1 A/g. And the capacitance retention rate is 87% when the current density increased to 10 A/g. Moreover, there is the excellent cycling stability with 71% capacity retention over 1 000 cycles at 2 A/g.
作者
刘珊珊
王艳素
马志领
LIU Shan-shan;WANG Yan-su;MA Zhi-ling(Institute of Chemistry and Environmental Science, Hebei University, Baoding Hebei 071002, China)
出处
《电源技术》
CAS
北大核心
2019年第4期622-625,共4页
Chinese Journal of Power Sources
