Journal
SCIENCE CHINA-CHEMISTRY
Volume 55, Issue 7, Pages 1319-1324Publisher
SCIENCE PRESS
DOI: 10.1007/s11426-012-4673-z
Keywords
supercapacitor; redox-active electrolyte; manganese dioxide; p-phenylenediamine; pseudocapacitance
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Funding
- National High Technology Research and Development Program of China [2009AA03Z217]
- National Natural Science Foundation of China [90922028, 50842027]
- Key Project of Ministry of Education of China [211204]
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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.
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