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Open Access Nano Express

Facile Synthesis of Novel Nanostructured MnO2Thin Films and Their Application in Supercapacitors

H Xia, W Xiao, MO Lai and L Lu*

Author Affiliations

Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore

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Nanoscale Research Letters 2009, 4:1035-1040  doi:10.1007/s11671-009-9352-4

Published: 2 June 2009

Abstract

Nanostructured α-MnO2thin films with different morphologies are grown on the platinum substrates by a facile solution method without any assistance of template or surfactant. Microstructural characterization reveals that morphology evolution from dandelion-like spheres to nanoflakes of the as-grown MnO2is controlled by synthesis temperature. The capacitive behavior of the MnO2thin films with different morphologies are studied by cyclic voltammetry. The α-MnO2thin films composed of dandelion-like spheres exhibit high specific capacitance, good rate capability, and excellent long-term cycling stability.

Keywords:
Supercapacitor; MnO2; Nanostructure; Thin film; Cyclic voltammetry