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Issue 7, 2014
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Three-dimensional metal/oxide nanocone arrays for high-performance electrochemical pseudocapacitors

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Abstract

Three-dimensional (3D) electrodes are critical for enabling high-performance power sources. We report here on the design and fabrication, by combining imprint and soft-printing technologies, of 3D nanocone arrays as a novel platform for high performance pseudocapacitors. Such purpose-built 3D nanocone arrays have the advantages of simplicity/versatility/reliability of fabrication, generality to a vast range of active materials, high electrode surface area, and ease of electrolyte permeation. As a demonstration of principle, Au and MnO2 were sequentially deposited forming a 3D Au/MnOx nanocone array electrode for a pseudocapacitor device. This device achieved a specific mass (areal) capacitance of 840.3 F g−1 (88.2 mF cm−2) at a current density of 2 A g−1. Additionally, the asymmetric supercapacitor using the Au/MnOx nanocone array as the positive electrode and a carbon-based material as the negative electrode achieved a capacitance of 108.5 F g−1 at a current density of 1 A g−1, corresponding to an energy density of as high as 46.8 W h kg−1 at a power density of 0.72 kW kg−1. The cell still preserved 96.5% of the initial capacitance even after 2000 cycles at a current density of 2 A g−1. The initial result is at least on a par with those of the best asymmetric supercapacitors reported so far, and thus bolsters the development value of the conductive nanocone arrays for high-performance supercapacitors and other energy-storage devices.

Graphical abstract: Three-dimensional metal/oxide nanocone arrays for high-performance electrochemical pseudocapacitors

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Publication details

The article was received on 17 Dec 2013, accepted on 10 Jan 2014 and first published on 16 Jan 2014


Article type: Paper
DOI: 10.1039/C3NR06675D
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Nanoscale, 2014,6, 3626-3631

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    Three-dimensional metal/oxide nanocone arrays for high-performance electrochemical pseudocapacitors

    Y. Qiu, Y. Zhao, X. Yang, W. Li, Z. Wei, J. Xiao, S. Leung, Q. Lin, H. Wu, Y. Zhang, Z. Fan and S. Yang, Nanoscale, 2014, 6, 3626
    DOI: 10.1039/C3NR06675D

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