Electric double layer capacitance of multi-walled carbon nanotubes and B-doping effect |
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| Authors: | S Shiraishi M Kibe T Yokoyama H Kurihara N Patel A Oya Y Kaburagi Y Hishiyama |
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| Institution: | (1) Department of Nano-Material Systems, Graduate School of Engineering, Gunma University, Tenjin-cho 1-5-1 Kiryu, Gunma 376-8515, Japan;(2) Department of Environmental Energy Engineering, Faculty of Engineering, Musashi Institute of Technology, Tamazutsumi 1-28-1, Setagaya-ku, Tokyo 158-8557, Japan |
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| Abstract: | The double layer capacitance properties of multi-walled carbon nanotubes (MWCNTs) prepared by CVD were investigated using
propylene carbonate electrolytes. The original MWCNTsare typically entangled tubes with 10∼20 nm outer diameter, around 5 nm
inner diameter, and around 220 m2 g-1 of BET specific surface area. The galvanostatic measurement (40 mA g-1, 2∼4 V vs. Li/Li+) in a three-electrode system showed 15 F g-1 of gravimetric capacitance and a good rate of this property. Due to the tips opening by thermal oxidation, the specific surface
area and the capacitance increased. In contrast, heat-treatment at 3000 °C decreased the surface area and the capacitance
of the MWCNT due to defect recovery. A small amount (<1 at. %) of boron was doped to the MWCNT by heat-treatment at 2200 °C
or 2300 °C with a B-contained graphite crucible. The B-doping can improve the specific capacitance per surface area for the
MWCNTswhile maintaining the tube morphology. This effect of B-doping on the capacitance can be explained by modification of
the space charge layer in carbon.
PACS 81.07.De; 81.65.Mq; 82.47.Uv; 61.72.Vv |
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