Preparation of nanocrystalline Co_3O_4 and its properties as supercapacitors  

作　　者：CAO Lin, ZHOU Yingke, LU Mei & LI Hulin Department of Chemistry, Lanzhou University, Lanzhou 730000, China Correspondence should be addressed to Li Hulin ([e-mail]) 

出　　处：《Chinese Science Bulletin》2003年第12期1212-1215,共2页

摘　　要：Nanocrystallines Co3O4 with the particle di-ameter of 3 nm are prepared and tested as active electrode material for an electrochemical supercapacitor. The results of characterization indicate that the grain size of this mate-rial is very small; the specific surface area is very high (192 m2/g); the distributions of pore diameter are desirable and effective; furthermore, the agglomeration problem among small particles was solved to a certain extent. The electro-chemical tests show that the electrode prepared with the Co3O4 exhibits distinct characteristic of capacitance and very high specific capacitance of 365—401 F/g. Additionally, the main attribute of capacitance, namely supercapacitance, was also testified.Nanocrystallines Co3O4 with the particle di-ameter of 3 nm are prepared and tested as active electrode material for an electrochemical supercapacitor. The results of characterization indicate that the grain size of this mate-rial is very small; the specific surface area is very high (192 m2/g); the distributions of pore diameter are desirable and effective; furthermore, the agglomeration problem among small particles was solved to a certain extent. The electro-chemical tests show that the electrode prepared with the Co3O4 exhibits distinct characteristic of capacitance and very high specific capacitance of 365—401 F/g. Additionally, the main attribute of capacitance, namely supercapacitance, was also testified.

关 键 词：nanocrystallines CO3O4 PREPARATION electrochemical capacitors SUPERCAPACITANCE AC impedance. 

分 类 号：O738[理学—晶体学]