Variation of nitrogen species in zeolite-templated carbon by low-temperature carbonization of pyrrole and the effect on oxygen reduction activity

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Nitrogen-doped microporous carbons with various compositions of pyridinic, pyrrolic, and graphitic N species were synthesized by the pyrolysis of pyrrole using Ca2+ ion-exchanged Y zeolite as a template. The Ca2+ ions in zeolite pores served as a catalyst to lower the carbonization temperature, resolving the problems associated with high carbonization temperature, such as inhomogeneous carbon deposition, easy breakage of weak C-N bonds, and preferential formation of thermodynamically stable graphitic N species. The resultant carbons exhibited a 3D microporous structure with high surface area and uniform micropore diameters, as well as high N content (5-6 wt%). Taking advantage of the lowered carbonization temperature, the ratio of the N species was modulated by the carbonization temperature, while a similar pore structure of the carbons was maintained. These N-doped carbons were used to investigate the efficiency of each N species on the electrochemical oxygen reduction, without the influences from the porous structure of the carbons. The results of this electrochemical investigation indicate that the graphitic N was more effective in enhancing the oxygen-reduction performance of the 3D microporous carbons than pyridinic N.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2019-04
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS CHEMISTRY A, v.7, no.14, pp.8353 - 8360

ISSN
2050-7488
DOI
10.1039/c9ta01621j
URI
http://hdl.handle.net/10203/261719
Appears in Collection
CH-Journal Papers(저널논문)
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