Sparse MnO2 nanowires clusters for high-performance supercapacitors

MnO2 nanowires clusters are electrodeposited onto Ni foam by a cyclic voltammetric technique. MnO2 nanowires, about 20nm in diameter and up to 200nm in length, present a sparse grass clusters structure. As cathode material for supercapacitors, MnO2 nanowires clusters exhibit superior pseudocapacitan...

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Bibliographic Details
Published in:Materials letters 2012-04, Vol.73, p.194-197
Main Authors: Yuan, Y.F., Pei, Y.B., Guo, S.Y., Fang, J., Yang, J.L.
Format: Article
Language:English
Subjects:
electrochemistry
electrodes
electron transfer
Energy storage and conversion
foams
grasses
MnO2
Nanocrystalline materials
nanowires
nickel
reaction kinetics
Supercapacitor
surface area
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Summary:MnO2 nanowires clusters are electrodeposited onto Ni foam by a cyclic voltammetric technique. MnO2 nanowires, about 20nm in diameter and up to 200nm in length, present a sparse grass clusters structure. As cathode material for supercapacitors, MnO2 nanowires clusters exhibit superior pseudocapacitance performances with high specific capacitances (1080Fg−1 at 4Ag−1 and 415Fg−1 at 30Ag−1) as well as excellent large-current cycling stability, making it suitable for high-performance supercapacitor application. The improved pseudocapacitance performances are attributed to small size, large surface area and high dispersion degree of MnO2 NWs, as well as 3-Dimension structure of Ni foam, which provide faster ion and electron transfer, larger reaction surface area, higher electrochemical activity, leading to faster reaction kinetics and higher material utilization ratio. ► Sparse MnO2 nanowires clusters on Ni foam. ► The pseudocapacitance is up to 1080Fg−1, and the large-current cycling performance is excellent. ► Characteristics: small size, large dispersion degree of nanowire cluster, 3D structure of Ni foam.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2012.01.046