Journal
RSC ADVANCES
Volume 6, Issue 60, Pages 54693-54701Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra08607a
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Funding
- National Natural Science Foundation of China [51273075, 21274052, 51473065, 21474043]
- Graduate Innovation Fund of Jilin University [2015011]
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A novel composite nanostructure of C-CoOx-C with CoOx nanoparticles embedded in N-containing porous graphite carbon nanofibers (CNF) is successfully prepared via sintering the electrospun polyacrylonitrile-cobalt acetate tetrahydrate nanofibers covered by a polypyrrole (PPy) sheath that were attained from the chemical vapor-phase polymerization of pyrrole monomers using concentrated nitric acid as both the dopant and oxidant for the first time. The unique configuration with a well-defined morphology possesses a large specific surface area and prominent conductivity contributed to by the catalysis of metallic Co and the external PPy-derived carbon envelope, which could facilitate effective electron transfer and rapid ion penetration in C-CoOx-C, thus improving its electrochemical performance. As expected, when employed as an electrode active material for supercapacitors, the resultant C-CoOx-C showed a more acceptable specific capacitance, better rate capability and higher cycling stability than individual CNF and CoOx nanoparticle-decorated CNF without the coating of a N-doped carbon layer from PPy (C-CoOx).
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