The DOI matches its Crossref record; 44 of the 44 references it cites were found in a registry or an index.
Nitrogen-containing microporous carbon nanospheres with improved capacitive properties
Open accessAbstract
We report the largely improved electrochemical capacitance of polypyrrole-derived microporous carbon nanospheres (MCNs, 80–100 nm in diameter) containing nitrogen functional groups. We have investigated the electrochemical properties of precursor polypyrrole nanospheres (PNs, with a high N/C ratio and low surface area) and as-derived carbon nanospheres (CNs, with a moderate N/C ratio and low surface area) prepared by carbonizing PNs at different temperatures, and MCNs (with a low N/C ratio and high surface area) obtained by chemical activation of CNs. The samples are thoroughly characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, thermogravimetric analysis (TGA), nitrogen sorption, elemental analysis, and X-ray photoelectron spectroscopy (XPS). It is found that MCNs with a high surface area and N-doping species exhibit much better capacitive performance compared to the PNs and CNs, and commercial carbon blacks (XC-72 and BP2000) as well. The MCN sample gives a reversible specific capacitance of ∼240 F g−1 for 3000 cycles in aqueous media as a result of combined advantages of high electrochemical activity of doped heteroatoms (N and O) and accessible well-developed porosity, demonstrating the promising use in high-energy-density supercapacitors.
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Metadata
- Authors
- Su, F., Poh, C. K., Chen, J. S., Xu, G., Wang, D., Li, Q., Lin, J., & Lou, X. W.
- Venue
- Energy Environ. Sci.
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2011
- Volume
- 4
- Issue
- 3
- Pages
- 717-724
- ISSN
- 1754-5692 (ISSN-L)
- 1754-5706
- OpenAlex
- W2110404509
- Cited by
- 916
- References
- 44
- FWCI
- 11.54
- Type
- journal article
- Language
- en
- Open access
- green
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