摘要
采用灌注法将硝酸钴Co(NO3)2.6H2O负载到介孔氧化硅MCM-41孔道内,经煅烧得到Co3O4/MCM-41-x(x表示四氧化钴Co3O4与MCM-41的质量比)复合材料。利用X射线衍射、透射电子显微镜、N2吸附-脱附、循环伏安和交流阻抗技术研究了材料的化学组成、结构特征及电化学性能。结果表明,该材料的比表面积为280～440 m2/g,孔体积为0.22～0.34 cm3/g。Co3O4的负载量、扫描速率以及电解液浓度对材料的电化学性能均有显著影响。当x=1.6、扫描速率为3 mV/s、电解液为6 mol/L KOH溶液时,材料比电容高达308 F/g,500次循环测试后比电容保留率为91.3%。
By impregnating the cobalt nitrate Co（NO3）2·6H2O into the pore channels of mesoporous silica MCM-41 and then calcining the obtained precursors,the Co3O4/MCM-41-x（x is the mass ratio of cobaltic-cobattous oxide Co3O4 to MCM-41）series composites are made.The X-ray diffraction,the transmission electron microscopy,the N2 adsorption-desorption and the cyclic voltammetry and AC impedance spectroscopy are used to survey the chemical compositions,the structural characteristics and the electrochemical properties of titled materials.The results disclose that the specific surface areas and the pore volumes of materials are 280-440 m^2/g and 0.22-0.34 cm^3/g respectively.The loading of Co3O4,the sweep rate and the electrolyte concentration have significant influences on the electrochemical performances of the composites materials.When x is 1.6,the sweep rate is 3 mV/s,the specific capacitance of the material is 308 F/g and the electrode solution is 6 mol/L KOH,the retention rate of the specific capacitance is 91.3% after 500 continuous cycles.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2012年第2期353-358,共6页
Journal of Nanjing University of Science and Technology
基金
国家自然科学基金(50772048)
关键词
介孔材料
四氧化三钴
电极材料
超级电容器
mesoporous materials
cobaltic-cobattous oxide
electrode materials
supercapacitors
