选用 HNO 3对有序介孔碳材料进行表面改性.通过红外光谱、氮气吸-脱附等测试手段对介孔碳(OMC)和硝酸改性介孔碳(OMC-H)的结构进行表征.采用循环伏安、恒流充放电、交流阻抗等测试比较OMC 和 OMC-H 的电化学性能.结果表明,改性后OMC-H 的孔结构发生了变化,OMC 的介孔孔径增大,比表面积和孔体积减小.同时,改性也改善了超级电容器的电化学性能.OMC-H 单电极在1 mV/s 的比电容为262 F/g,高于 OMC 单电极的比电容(205 F/g).改性后 OMC-H 电容器的电荷转移阻抗明显减小. OMC-H 电容器欧姆电压降明显小于OMC,表明硝酸改性后介孔碳电极的等效串联内阻减小.改性后 OMC-H 电容器充放电1500次以后,比电容趋于稳定在58 F/g,相比改性前 OMC 电容器的49 F/g 有明显的增加.
The surface modification of ordered mesoporous carbon (OMC)material by nitric acid (HNO 3 )was studied.The structure of the HNO 3-modified OMC (OMC-H)was characterized by Fourier transform infrared, N2 adsorption-desoprtion measurement and transmission electron microscopy.The electrochemical performances of the supercapacitor using OMC and OMC-H as electrode material were compared by cyclic voltammetry,gal-vanostatic charge/discharge,electrochemical impedance spectroscopy.The results showed that the structure of the OMC samples was changed after surface modification,the specific surface area and the pore volume was in-creased.Meanwhile,the electrochemical performance of the supercapacitor was enhanced after HNO 3 modifica-tion.
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