中等比表面积高容量活性炭电极材料制备和表征  

Preparation and Characterization of Activated Carbon Electrode Materials with High Capacitance and Medium Specific Surface Area

作　　者：郑祥伟[1] 胡中华[1] 刘亚菲[1] 高强[1] 温祖标[1] 

机构地区：[1]同济大学化学系,上海200092

出　　处：《复旦学报（自然科学版）》2009年第1期58-64,72,共8页Journal of Fudan University：Natural Science

基　　金：国家自然科学基金资助项目(50472089)

摘　　要：以天然高分子椰壳为原料,采用ZnCl2预活化和CO2/水蒸气活化的二次活化法制备活性炭.用氮气吸附和傅里叶红外表征活性炭材料的比表面积,孔结构以及表面化学性质.结果显示,所制备的活性炭比表面积和孔径可调,中孔率为16.3%~36.9%.经首步活化的中间炭具有丰富的微孔和表面官能团,并随着第二步活化时间的增加逐渐分解,同时伴随着炭烧失率增加,导致比表面积、孔容和孔径的增大.以制备的活性炭作为电极材料,6mol.L-1KOH电解液构成模拟电容器.采用恒流充放电、循环伏安、交流阻抗等方法研究了其电化学性能.结果显示,含氧官能团增加了活性炭表面的润湿性,并对比电容的增加有较大的贡献;而炭材料的比表面积增加对比电容有负面影响.中等比表面积968m2.g-1样品的比电容达到278F.g-1,面积比电容高达29μF.cm-2.Natural polymer coconut shells were used as raw materials to prepare activated carbon with an improved two-step ZnCl2 and CO2/steam activation method.The specific surface area,porosity and surface property of the prepared samples were studied by the nitrogen adsorption and FT-IR spectroscopy.The results showed that the surface area and pore size of activated carbons could be tailored.The resultant carbons possessed the mesoporosity from 16.3% to 36.9%.The primary products of first step activation had abunda...

关 键 词：活性炭 二次活化 表面官能团 电极材料 电化学电容器 

分 类 号：TM53[电气工程—电器]