Unusual increase in the electric double-layer capacitance with charge–discharge cycles of nitrogen doped single-walled carbon nanotubes
Nitrogen-doping treatments using cyanamide as a nitrogen source have been done for several kinds of single-walled carbon nanotubes (SWCNTs). For SWCNT samples produced by chemical vapor deposition, N 1s X-ray photoelectron spectroscopy peaks can be observed, and the atomic nitrogen doping percentage is estimated to be 1.8 at.%. It was found that the electric double-layer capacitance of the nitrogen-doped SWCNT sample is much larger than that of the pristine sample. Furthermore, the doped sample shows a better rate performance due to its smaller electric resistance. It should also be noted that the capacitance of the nitrogen-doped SWCNTs increases with charge–discharge cycles. This unusual increase is discussed based on the results of XPS, Raman, and cyclic voltammogram measurement results.
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Document Type: Short Communication
Publication date: August 1, 2014
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