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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, MnMoO4/CoMoO 4. Hierarchical heterostructures are successfully prepared on the backbone material MnMoO4 by a simple refluxing method under mild conditions; and surface modification is achieved. We fabricate asymmetric supercapacitors based on hierarchical MnMoO4/CoMoO4 heterostructured nanowires, which show a specific capacitance of 187.1Fg -1 at a current density of 1Ag-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. © 2011 Macmillan Publishers Limited. All rights reserved.

Hierarchical MnMoO4/CoMoO4 heterostructured nanowires with enhanced supercapacitor performance