双电层电容器用淀粉基微孔炭微球制备及性能  

Preparation and performance of starch based microporous carbon microspheres used in EDLC

作　　者：杜思红[1] 付晓亭[1] 陈明鸣[1] 于宝军[1] 王成扬[1] 

机构地区：[1]天津大学化工学院绿色合成与转换教育部重点实验室,天津300072

出　　处：《电源技术》2014年第4期658-660,671,共4页Chinese Journal of Power Sources

基　　金：国家"973"项目(2012CB720302);国家自然科学基金面上项目(51172160);国家"863"计划资助项目(2011AA11A23 2);天津市应用基础与前沿技术研究计划重点基金项目(12JCZDJC27000)

摘　　要：以具有天然球形颗粒结构的生物质原料马铃薯淀粉为前驱体,通过(NH4)2HPO4活化和KOH二次活化制备微孔炭微球。采用扫描电镜(SEM)、透射电镜(TEM)和N2吸附-脱附分别对样品的形貌特征和孔隙结构进行表征,并在6mol/L KOH电解质溶液中对样品进行电化学测试。结果表明:经二次活化后可制得比表面积2 325 m2/g,总孔容1.11cm3/g,微孔孔容0.82 cm3/g的高微孔率活性炭微球。所制炭微球具有优异的电化学电容特性:在50 mA/g电流密度下,质量比电容为304 F/g;在1 000 mA/g较大的电流密度下,质量比电容为277.4 F/g;在200 mV/s快速电压扫描速率下,循环伏安(CV)曲线仍能保持良好的矩形形状。Microporous carbon microspheres （AC-2） were prepared from potato starch via a two step activation method. （NH,）2HPO4 and KOH were selected as activators for the first and second activation process, respectively. The morphology and pore structure of the samples were characterized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and N2 adsorption-desorption techniques. The electrochemical performance of AC-2 was measured in 6 mol/dm3 KOH electrolyte. The results demonstrate that the BET surface of the final product is 2 325 m2/g and its total pore volume is 1.11 cm3/g. Micropores are major structure component whose volume is 0.82 cm3/g. Besides, AC-2 exhibits excellent capacitive behaviors. A high specific capacitance of 304 F/g can be obtained at a current density of 50 mA/g. It also shows good rate capability. A specific capacity of 277.4 F/g can still be maintained even at a high current density of 1 000 mA/g and CV curves still remain rectangular shape even when the scan rate increase to 200 mV/s.

关 键 词：淀粉 微孔炭微球 高容量 电化学双电层电容器 

分 类 号：TM53[电气工程—电器]