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

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 specific capacitance reaching 635 Fg-1, as well as the highest areal power (100 mWcm-2) and energy (0.46 mWhcm-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 nanowire (C/PSiNWs) as the negative electrode and 1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide (EMIM-TFSI)/acetonitrile as the electrolyte. The supercapacitor shows excellent power density of 25 kWkg-1 and energy density of 261 Whkg-1 at the current density of 0.2 mAcm-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/PSiNWs electrodes are promising materials for the future generation of 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, Accepted Manuscript
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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, Accepted Manuscript , DOI: 10.1039/C7EE00977A

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