Application of a novel redox-active electrolyte in MnO2-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

来源：Science China Chemistry, 2012, 55(7): 1319-1324.

DOI：10.1007/s11426-012-4673-z

• supercapacitor
• redox-active electrolyte
• manganese dioxide
• p-phenylenediamine
• pseudocapacitance

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.

• 出版日期2012-7
• 单位华侨大学