期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 27, 期 35, 页码 9152-9159出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202100113
关键词
manganese oxide; Mn2O3; redox couple; supercapacitor; tervalent
资金
- National Natural Science Foundation of China [61774033]
- Scientific Research Foundation of Graduate School of Southeast University [YBYP2153]
- Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservior [WEPKL2016LL-01, WEPKL2019ZD-03]
Three manganese microspheres were prepared and their multiple redox reactions were analyzed, showing that trivalent manganese Mn2O3 exhibited multiple redox transitions during the intercalation/deintercalation of electrolyte ions, leading to high specific capacitance and long cycling stability.
Manganese oxides have attracted great interest in electrochemical energy storage due to high theoretical specific capacitance and abundant valence states. The multiple valence states in the redox reactions are beneficial for enhancing the electrochemical properties. Herein, three manganese microspheres were prepared by a one-pot hydrothermal method and subsequent calcination at different temperatures using carbon spheres as templates. The trivalent manganese of Mn2O3 exhibited multiple redox transitions of Mn3+/Mn2+ and Mn4+/Mn3+ during the intercalation/deintercalation of electrolyte ions. The possible redox reactions of Mn2O3 were proposed based on the cyclic voltammetry and differential pulse voltammogram results. Mn2O3 microsphere integrated the advantages of multiple redox couples and unique structure, demonstrating a high specific capacitance and long cycling stability. The symmetric Mn2O3//Mn2O3 device yielded a maximum energy density of 29.3 Wh kg(-1) at 250 W kg(-1).
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