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Issue 3, 2015
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Hierarchical heterostructures of Ag nanoparticles decorated MnO2 nanowires as promising electrodes for supercapacitors

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Abstract

Coating the redox-active transition-metal oxides (e.g., MnO2) with a conductive metal layer is one efficient approach to improve the electrical conductivity of the oxide-based electrodes, which could largely boost the energy density and power density of supercapacitors. Here, we report a facile yet efficient method to uniformly decorate conductive silver (Ag) nanoparticles (∼10 nm) on MnO2 nanowires (width of ∼10–20 nm), which leads to a remarkable improvement of the electrical conductivity and the supercapacitive performance of MnO2-based electrodes. For instance, at a low scan rate of 10 mV s−1, the as-designed Ag/MnO2 hybrid electrode delivers a specific capacitance of 293 F g−1, which is twofold higher than that of the bare MnO2 electrode (∼130 F g−1). In addition, the highly conductive Ag nanoparticle layer can also improve the rate capability of the Ag/MnO2 nanowire electrode, delivering a high specific energy density and power density of 17.8 W h kg−1 and 5000 W kg−1, respectively, at a current density of 10 A g−1.

Graphical abstract: Hierarchical heterostructures of Ag nanoparticles decorated MnO2 nanowires as promising electrodes for supercapacitors

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Supplementary files

Article information


Submitted
18 Oct 2014
Accepted
14 Nov 2014
First published
14 Nov 2014

J. Mater. Chem. A, 2015,3, 1216-1221
Article type
Paper
Author version available

Hierarchical heterostructures of Ag nanoparticles decorated MnO2 nanowires as promising electrodes for supercapacitors

H. Xia, C. Hong, X. Shi, B. Li, G. Yuan, Q. Yao and J. Xie, J. Mater. Chem. A, 2015, 3, 1216
DOI: 10.1039/C4TA05568C

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