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Title: Exploration of the active center structure of nitrogen-doped graphene-based catalysts for oxygen reduction reaction
Authors: Lai, L.
Potts, J.R.
Zhan, D.
Wang, L.
Poh, C.K.
Tang, C.
Gong, H. 
Shen, Z.
Lin, J.
Ruoff, R.S.
Issue Date: Jul-2012
Citation: Lai, L., Potts, J.R., Zhan, D., Wang, L., Poh, C.K., Tang, C., Gong, H., Shen, Z., Lin, J., Ruoff, R.S. (2012-07). Exploration of the active center structure of nitrogen-doped graphene-based catalysts for oxygen reduction reaction. Energy and Environmental Science 5 (7) : 7936-7942. ScholarBank@NUS Repository.
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 the N precursors 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 pyridinic N content improved the onset potential for ORR. However, the total N content in the graphene-based non-precious metal catalyst does not play an important role in the ORR process. © 2012 The Royal Society of Chemistry.
Source Title: Energy and Environmental Science
ISSN: 17545692
DOI: 10.1039/c2ee21802j
Appears in Collections:Staff Publications

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