Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 22, Issue 6, Pages 928-934Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S2095-4956(14)60274-6
Keywords
energy storage; nanostructured MnO2; supercapacitors; electrochemical performance; electrode material
Funding
- National Natural Science Foundation of China [51203071, 51363014, 21163010]
- Key Project of Chinese Ministry of Education [212183]
- Program for Hongliu Young Teachers in Lanzhou University of Technology [201201]
- Natural Science Funds for Distinguished Young Scholars of Gansu Province [1111RJDA012]
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A novel bird nest-like nanostructured MnO2 (BNNS-MnO2) was prepared by a facile and cost-effective strategy. Their structures and morphologies were characterized by field emission scanning electron microscopy, transmission electron microscopy and powder X-ray diffraction. Capacitive behaviors were investigated by cyclic voltammetry and galvanostatic charge-discharge. The obtained nano-MnO2 possesses a well designed loose-assembled hierarchical nanoarchitecture with an appropriate crystallinity which gives rise to excellent performances as an electrode material for supercapacitors. A maximum specific capacitance of 917 F/g has been obtained at a current density of 5 mA/cm(2) in 6 mol/L KOH aqueous solution, and a specific capacitance of 210 F/g has been maintained for 500 cycles. As the low cost of MnSO4 and KCr2O7 and the low reaction temperature, the present method avoids the requirements for complicated operations, time/energy-consuming and expensive reagents, and perhaps is ready for the industrialization of nano-MnO2 production.
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