分级多孔炭的制备及其电化学性能研究  

Preparation and electrochemical performance of hierarchical porous carbons

作　　者：乔松[1] 孙刚伟[1] 张建华[1] 宋文华[1] 乔文明[1] 凌立成[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《炭素技术》2010年第1期14-19,共6页Carbon Techniques

基　　金：国家自然科学基金重点项目(50730003);教育部新世纪优秀人才支持计划项目(NCET-07-0285);国家科技支撑计划项目(2007BAE55B00)

摘　　要：以间苯二酚和甲醛为前驱体,原位合成的Mg(OH)2为模板剂,KOH作为催化剂、沉淀剂、活化剂,一步法合成具有小/中/大孔的分级多孔炭。使用扫描电镜、透射电镜、氮气吸附、X射线衍射对样品的结构进行表征。通过恒流充放电、循环伏安、电化学阻抗谱,测试样品在1mol/L的(C2H5)4NBF4/碳酸丙烯酯(Propylene carbonatePC)电解液中的电化学性能。结果表明,随着KOH对间苯二酚用量的增加,材料的比表面积和孔容先增大后减小,其最大值分别为1300m2/g和0.89cm3/g。该材料具有良好的容量性能和功率性能,在电流密度0.1A/g时,最高质量比电容可以达到116F/g;当电流密度增大到5A/g时,电容保持率为78%。Hierarchical porous carbons with micro/meso/macropores were prepared by a one-step route with resorcinol and formaldehyde as precursors, in-situ synthesized Mg（OH） 2 as a template and KOH as reaction catalyst , precipitating agent and activation agent. The structures of the hierarchical porous carbons were characterized by scanning electron microscopy, transmission electron microscopy, nitrogen adsorption and X -ray diffraction measurements. The electrochemical behavior of the samples was tested by galvanostatic charge-discharge, cyclic vohammetry and electrochemical impedance spectroscopy using 1 mol/L （C2H5） 4NBF4/ Propylene carbonate （PC） as electrolyte. The results show that the specific surface area and the pore volume of the carbons in- crease first and then decrease with an increase of mass ratio of KOH to resorcinol. The highest values, 1 300 m2/g and O. 89 cm3/g, were achieved, respectively. Moreover, the resultant carbon exhibits excellent capacitance and power performance when was used as the electrode material for electric double-layer capacitor. The highest specific capacitance up to 116 F/g was ob- tained at a current density 0. 1 A/g and the ratio of retained capacitance of the sample was 780/0 at a current density 5 A/g.

关 键 词：超级电容器 分级多孔炭 孔结构 模板 

分 类 号：TQ424.1[化学工程] TM53[电气工程—电器]