Co_2O_3/石墨烯复合材料的结构及电化学性能研究
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摘要
采用CoCl_3·(H_2O)_6作为钴源通过化学反应制备了Co_2O_3,并用水热法制备了Co_2O_3/石墨烯的复合材料。利用XRD、Raman、SEM对其进行结构表征。结果表明:制备样品结晶完整,能够体现相应物相的XRD特征峰值;并且样品的Raman图样不但体现出Co_2O_3的特征谱峰,而且在能够体现石墨烯单层结构分离度好的2D峰处也表现出优异的特性。样品微观组织观察发现Co_2O_3呈棒状短柱状嵌入或平布在石墨烯基底上。电化学测试表明:复合材料电化学性能优良,在50 mV/s的扫描速率下质量比电容达到了240 F/g。
Co_2O_3/graphene composite was prepared by hydrothermal method. Co_2O_3 was prepared by chemical method from CoCl_3·(H_2O)_6. The structure was characterized by XRD,Raman and SEM. The results show that the prepared samples have complete crystallization and can reflect the XRD characteristic peaks of corresponding phases,and the Raman pattern of the samples not only reflects the characteristic peaks of Co_2O_3,but also shows excellent characteristics at the 2D peaks which can reflect the good separation of graphene monolayer structure. Microstructure observation of the samples showed that Co_2O_3 was rod-shaped and short columnar embedded or flat on graphene substrates. The electrochemical tests show that the composite has excellent electrochemical properties and the mass specific capacitance reaches 240 F/g at the scanning rate of 50 mV/s.
Co_2O_3/graphene composite was prepared by hydrothermal method. Co_2O_3 was prepared by chemical method from CoCl_3·(H_2O)_6. The structure was characterized by XRD,Raman and SEM. The results show that the prepared samples have complete crystallization and can reflect the XRD characteristic peaks of corresponding phases,and the Raman pattern of the samples not only reflects the characteristic peaks of Co_2O_3,but also shows excellent characteristics at the 2D peaks which can reflect the good separation of graphene monolayer structure. Microstructure observation of the samples showed that Co_2O_3 was rod-shaped and short columnar embedded or flat on graphene substrates. The electrochemical tests show that the composite has excellent electrochemical properties and the mass specific capacitance reaches 240 F/g at the scanning rate of 50 mV/s.
引文
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[2] Conway B E. Electrichemical Supercapacitors[M]. New York:Plenum Publishers,1999.
[3] Sarangapani S,Tilak B V,Chen C P. Materials for electrochemical capacitors[J]. J. Electrochem Soc,1996,143(11):3791-3799.
[4]朱修锋,景晓燕.金属氧化物超级电容器及其应用研究进展[J].功能材料与器件学报,2002,8(3):325-330.
[5]吴洪鹏.石墨烯的制备及在超级电容器中的应用[D].北京:北京交通大学,2012.
[6] Zheng hua Ni,Ying ying Wang,Ting Yu,Raman Spectroscopy and Imaging of Graphene[J]. Nano Res.(2008)1:273-291.
[7] Yu M,Wang Z,Hou C,et al. Nitrogen-doped Co3O4mesoporous nanowire arrays as an additive-free air-cathode for flexible solid-statezinc-air batteries[J]. Adv Mater,2017,29(15):1602868.
[8]邓霆.超级电容器钴基电极材料制备及其储能机理的研究[D].长春:吉林大学,2017.
[9]袁文俊,周勇敏.纳米颗粒团聚的原因和解决措施[J].材料导报,2008,18(22):59-61.
[10]梁颖晶.石墨烯和碳纳米管尺度效应的研究[D].广州:华南理工大学,2012.
[11] Lokhande V C,Lokhande A C,Lokhande C D. Supercapacitive Composite Metal Oxide Electrodes Formed with Carbon,metal oxides and conducting polymers[J]. Journal of Alloys and Compounds,382(2016)381-403.
[12]高鹏,朱永明.电化学基础教程[M].化学工业出版社,北京,2013. 7:84-85.
[13] JIANG P,WANG Q,DAI J,et al. Fabrication of Ni O@Co3O4core/shell nanofibres for high-performance supercapacitors[J]. Mater Lett,2017,188:69-72.
[14] Rakhi R B,Wei Chen,Dong kyu Cha,et al. Substrate dependent selforganization of mesoporous cobalt oxide nanowires with remarkable pseudocapacitance[J]. Nano Lett. 12(2012)2559-2567.
[15] Xiao wei Wang,Min xia Li,Zheng Chang,et al. Co3O4@MWCNT nanocable as cathode with superior electrochemical performance for supercapacitors[J]. ACS Appl. Mater. Interfaces 7(2015)2280-2285.
[16]戴剑锋,朱晓军,刘骥飞,等,Co3O4/C纳米纤维锂离子电池负极材料性能研究[J].人工晶体学报. 2018,10(47):2004-2008.