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 

机构地区：[1]Engineering Research Center of Environment-Friendly Functional Materials,Ministry of Education,Institute of Materials Physical Chemistry,Huaqiao University,Quanzhou 362021,China

出　　处：《Science China Chemistry》2012年第7期1319-1324,共6页中国科学（化学英文版）

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)

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 supercapacitors.The 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) techniques.The introduction of p-phenylenediamine significantly improves the performance of the supercapacitor.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 Kg-1.In addition,the supercapacitor exhibits good cycle-life stability.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 MnO2-based supercapacitors. The morphology and compositions of ball-milled MnO2 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） techniques. The introduction of p-phenylenediamine significantly improves the performance of the supercapacitor. 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 Kg-1. In addition, the supercapacitor exhibits good cycle-life stability.

关 键 词：SUPERCAPACITOR redox-active electrolyte manganese dioxide P-PHENYLENEDIAMINE PSEUDOCAPACITANCE 

分 类 号：O614.711[理学—无机化学]