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Nat Commun. 2011 Jul 5;2:381. doi: 10.1038/ncomms1387.

Hierarchical MnMoO(4)/CoMoO(4) heterostructured nanowires with enhanced supercapacitor performance.

Author information

1
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology, Wuhan 430070, China. mlq@cmliris.harvard.edu

Abstract

Recent attention has been focused on the synthesis and application of complex heterostructured nanomaterials, which can have superior electrochemical performance than single-structured materials. Here we synthesize the three-dimensional (3D) multicomponent oxide, MnMoO(4)/CoMoO(4). Hierarchical heterostructures are successfully prepared on the backbone material MnMoO(4) by a simple refluxing method under mild conditions; and surface modification is achieved. We fabricate asymmetric supercapacitors based on hierarchical MnMoO(4)/CoMoO(4) heterostructured nanowires, which show a specific capacitance of 187.1 F g(-1) at a current density of 1 A g(-1), and good reversibility with a cycling efficiency of 98% after 1,000 cycles. These results further demonstrate that constructing 3D hierarchical heterostructures can improve electrochemical properties. 'Oriented attachment' and 'self-assembly' crystal growth mechanisms are proposed to explain the formation of the heterostructures.

PMID:
21730961
DOI:
10.1038/ncomms1387
[Indexed for MEDLINE]

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