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Issue 6, 2017
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MnOx-decorated carbonized porous silicon nanowire electrodes for high performance supercapacitors

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Abstract

In this study, manganese oxide (MnOx)-decorated carbonized porous silicon nanowire arrays (MnOx/C/PSiNWs) are synthesized through eco-friendly and cost-effective processes. This electrode material system exhibits excellent electrochemical behavior with a specific capacitance reaching 635 F g−1, as well as the highest areal power (100 mWcm−2) and energy (0.46 mW h cm−2) ever reported in a silicon nanowire-based pseudocapacitor electrode. Furthermore, an asymmetric hybrid supercapacitor (AHS) is designed using MnOx/C/PSiNWs as the positive electrode, carbonized porous silicon nanowires (C/PSiNWs) as the negative electrode and 1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide (EMIM-TFSI)/acetonitrile as the electrolyte. The supercapacitor shows an excellent power density of 25 kW kg−1 and an energy density of 261 W h kg−1 at a current density of 0.2 mA cm−2 with a large operational potential window (3.6 V) and a good capacitance retention (82% after 10 000 CV cycles). The results show that the MnOx/C/PSiNW electrodes are promising materials for the future generation of high performance supercapacitors.

Graphical abstract: MnOx-decorated carbonized porous silicon nanowire electrodes for high performance supercapacitors

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Publication details

The article was received on 11 Apr 2017, accepted on 19 May 2017 and first published on 19 May 2017


Article type: Paper
DOI: 10.1039/C7EE00977A
Citation: Energy Environ. Sci., 2017,10, 1505-1516
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    MnOx-decorated carbonized porous silicon nanowire electrodes for high performance supercapacitors

    S. Ortaboy, J. P. Alper, F. Rossi, G. Bertoni, G. Salviati, C. Carraro and R. Maboudian, Energy Environ. Sci., 2017, 10, 1505
    DOI: 10.1039/C7EE00977A

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