Details

Autor(en) / Beteiligte

• Tang, W.
• Hou, Y.Y.
• Wang, X.J.
• Bai, Y.
• Zhu, Y.S.
• Sun, H.
• Yue, Y.B.
• Wu, Y.P.
• Zhu, K.
• Holze, R.

Titel

A hybrid of MnO2 nanowires and MWCNTs as cathode of excellent rate capability for supercapacitors

Ist Teil von

• Journal of power sources, 2012-01, Vol.197, p.330-333

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2012

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• ► Well entangled hybrids of MnO2 nanowires and MWCNTs are obtained by a facile method. ► Their electrochemical performance as cathode for supercapacitors in 0.5moll−1 Li2SO4 aqueous electrolyte is reported. ► The energy density (17.8Whkg−1) of the supercapacitor stays almost unchanged with power density from 400 to 3340Wkg−1. ► The energy density of the supercapacitor does not fade much after 13,000 cycles. A hybrid of MnO2-nanowires and MWCNTs to be used as cathode in a supercapacitor with good electrochemical performance was prepared by a facile hydrothermal method. In this hybrid the α-MnO2 nanowires are well entangled with MWCNTs. The MWCNTs provide a network for fast electron transport whereas MnO2 nanowires show a fast redox response. Since gain/loss of both electrons and ions can be realized very rapidly at the same time, the hybrid has an excellent rate capability and delivers an energy density of 17.8Whkg−1 at 400Wkg−1, which is maintained almost constant even at 3340Wkg−1 in 0.5M Li2SO4 aqueous electrolyte. The cycling behavior is very good even in the presence of oxygen. The data present great promise for the hybrid as a practical cathode material for aqueous supercapacitor.