Application of a novel redox-active electrolyte in MnO_2-based supercapacitors

作     者：YU HaiJun WU JiHuai FAN LeQing LIN YouZhen CHEN ShuHong CHEN Yuan WANG JiangLi HUANG MiaoLiang LIN JianMing LAN Zhang HUANG YunFang 

作者机构：Engineering Research Center of Environment-Friendly Functional MaterialsMinistry of EducationInstitute of Materials Physical ChemistryHuaqiao UniversityQuanzhou 362021China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2012年第55卷第7期

页      面：1319-1324页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：supported by the National High Technology Research and Development Program of China (2009AA03Z217) the National Natural Science Foundation of China (90922028,50842027) the Key Project of Ministry of Education of China (211204) 

主　　题：supercapacitor redox-active electrolyte manganese dioxide p-phenylenediamine pseudocapacitance 

摘      要：This paper reports a novel strategy for preparing redox-active electrolyte through introducing a redox-mediator(p-phenylenediamine,PPD) into KOH electrolyte for the application of ball-milled MnO 2-based *** morphology and compositions of ball-milled MnO 2 were characterized using scanning electron microscopy(SEM) and X-ray diffraction(XRD).The electrochemical properties of the supercapacitor were evaluated by cyclic voltammetry(CV),galvanostatic charge-discharge(GCD),and electrochemical impedance spectroscopy(EIS) *** introduction of p-phenylenediamine significantly improves the performance of the *** electrode specific capacitance of the supercapacitor is 325.24 F g-1,increased by 6.25 folds compared with that of the unmodified system(44.87 F g-1) at the same current density,and the energy density has nearly a 10-fold increase,reaching 10.12 Wh *** addition,the supercapacitor exhibits good cycle-life stability.