Fabrication of high-performance supercapacitors based on transversely oriented carbon nanotubes
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- 作者：F. Markoulidis (1)
C. Lei (1)
C. Lekakou (1) - 刊名：Applied Physics A: Materials Science & Processing
- 出版年：2013
- 出版时间：April 2013
- 年：2013
- 卷：111
- 期：1
- 页码：227-236
- 全文大小：1025KB
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C. Lei (1)
C. Lekakou (1)
1. Centre of Materials, Surfaces and Structural Systems, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, GU2 7XH, UK - ISSN：1432-0630
文摘
High-performance supercapacitors with organic electrolyte 1?M TEABF4 (tetraethyl ammonium tetrafluoroborate) in PC (propylene carbonate) were fabricated and tested, based on multiwall carbon nanotubes (MWNTs) deposited by electrophoresis on three types of alternative substrates: aluminium foil, ITO (indium tin oxide) coated PET (polyethylene terephthalate) film and PET film. In all cases, SEM (scanning electron microscopy) and STEM (scanning transmission electron microscopy) micrographs demonstrated that protruding, transversely oriented MWNT structures were formed, which should increase the transverse conductivity of these MWNT electrodes. The best supercapacitor cell of MWNT electrodes deposited on aluminium foil displayed good transverse orientation of the MWNT structures as well as an in-plane MWNT network at the feet of the protruding structures, which ensured good in-plane conductivity. Capacitor cells with MWNT electrodes deposited either on ITO-coated PET film or on PET film demonstrated lower but still very good performance due to the high density of transversely oriented MWNT structures (good transverse conductivity) but some in-plane inhomogeneities. Capacitor cells with drop-printed MWNTs on aluminium foil, without any transverse orientation, had 16-0 times lower specific capacitance and 5-0 times lower power density than the capacitor cells with the electrophoretically deposited MWNT electrodes.