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|Title:||Exploration of the active center structure of nitrogen-doped graphene-based catalysts for oxygen reduction reaction||Authors:||Lai, Linfei
Potts, Jeffrey R.
Poh, Chee Kok
Ruoff, Rodney S.
|Issue Date:||2012||Source:||Lai, L., Potts, J. R., Zhan, D., Wang, L., Poh, C. K., Tang, C., Gong, H., Shen, Z., Lin, J.,& Ruoff, R. S. (2012). Exploration of the active center structure of nitrogen-doped graphene-based catalysts for oxygen reduction reaction. Energy & Environmental Science, 5(7), 7936-7942.||Series/Report no.:||Energy & environmental science||Abstract:||We present two different ways to fabricate nitrogen-doped graphene (N-graphene) and demonstrate its use as a metal-free catalyst to study the catalytic active center for the oxygen reduction reaction (ORR). N-graphene was produced by annealing of graphene oxide (G-O) under ammonia or by annealing of a N-containing polymer/reduced graphene oxide (RG-O) composite (polyaniline/RG-O or polypyrrole/ RG-O). The effects of theNprecursors and annealing temperature on the performance of the catalyst were investigated. The bonding state of the N atom was found to have a significant effect on the selectivity and catalytic activity for ORR. Annealing of G-O with ammonia preferentially formed graphitic N and pyridinic N centers, while annealing of polyaniline/RG-O and polypyrrole/RG-O tended to generate pyridinic and pyrrolic N moieties, respectively.Most importantly, the electrocatalytic activity of the catalyst was found to be dependent on the graphitic N content which determined the limiting current density, while the pyridinicNcontent improved the onset potential forORR.However, the totalNcontent in the graphene-based non-precious metal catalyst does not play an important role in the ORR process.||URI:||https://hdl.handle.net/10356/98056
|DOI:||http://dx.doi.org/10.1039/c2ee21802j||Fulltext Permission:||none||Fulltext Availability:||No Fulltext|
|Appears in Collections:||SPMS Journal Articles|
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