中孔Co_3O_4材料的电容特性

Capacitance Characteristics of Mesoporous Co_3O_4

采用"原位合成模板法"以硅酸为模板、硝酸钴为钴源,制备了中孔Co3O4材料,研究了模板和硝酸钴的质量比对所制得的中孔Co3O4材料的微观结构和电化学性能的影响.用N2等温吸附—脱附和X线衍射测试了其微观结构.结果表明,随着模板质量比的增加,制备得到的Co3O4材料的比表面积增加,中孔结构越明显,结晶性逐渐降低.在6 mol/L氢氧化钾电解液中测试了其电化学性能,最优质量比制得的样品在5 mV/s扫描速率下的比电容达329 F/g.即使在较高扫描速率下,该质量比的中孔Co3O4比电容依然具有很好的保持性.

Using H2SiO3 as template and Co（NO3）2· 9H2O as cobalt resource,mesoporous Co3O4 was obtained by in-situ synthesis method.Effects of quality ratio of template and Co（NO3）2·9H2O on material microstructure and electrochemical properties of mesoporous Co3O4 were researched,and N2 adsorption and desorption isotherms and XRD were operated to test the microstructure of the material.The results show that with increasing proportions of the template,the prepared Co3O4 materials have an increasing specific surface area,the more significant in the mesoporous pore structure,the much decreased in crystallinity.Operating electrochemial test in 6 mol/L KOH electrolyte,the specific capacitance of mesoporous Co3O4 derived from the optimum ratio can reach 329 F/g at the scanning rate of 5 mV/s,and which has good retention even at higher scanning rate.