Facile synthesis of ultrathin manganese dioxide nanosheets arrays on nickel foam as advanced binder-free supercapacitor electrodes

Ming Huang, Xiao Li Zhao, Fei Li, Li Li Zhang, Yu Xin Zhang

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

© 2014 Elsevier B.V. Ultrathin MnO2 nanosheets arrays on Ni foam have been fabricated by a facile hydrothermal approach and further investigated as the binder-free electrode for high-performance supercapacitors. This unique well-designed binder-free electrode exhibits a high specific capacitance (595.2 F g-1 at a current density of 0.5 A g-1), good rate capability (64.1% retention), and excellent cycling stability (89% capacitance retention after 3000 cycles). Moreover, an asymmetric supercapacitor is constructed using the as-prepared MnO2 nanosheets arrays as the positive electrode and activated microwave exfoliated graphite oxide (MEGO) as the negative electrode. The optimized asymmetric supercapacitor displays excellent electrochemical performance with an energy density of 25.8 Wh kg-1 and a maximum power density of 223.2 kW kg-1. These impressive performances suggest that the MnO2 nanosheet array is a promising electrode material for supercapacitors.
Original languageEnglish (US)
Pages (from-to)36-43
Number of pages8
JournalJournal of Power Sources
Volume277
DOIs
StatePublished - Mar 2015
Externally publishedYes

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