Wet-chemical nitrogen-doping of graphene nanoplatelets as electrocatalysts for the oxygen reduction reaction
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- Wet-chemical nitrogen-doping of graphene nanoplatelets as electrocatalysts for the oxygen reduction reaction
- Chang, Dong Wook; Choi, Hyun-Jung; Baek, Jong-Beom
- Issue Date
- ROYAL SOC CHEMISTRYROYAL SOC CHEMISTRY
- JOURNAL OF MATERIALS CHEMISTRY A, v.3, no.14, pp.7659 - 7665
- We report a facile wet-chemical approach for the preparation of high-quality pyridinic N-rich nitrogen-doped graphene nanoplatelets (PN-GNs). Efficient doping of nitrogen atoms into two-dimensional graphene networks can be achieved via an acid-catalyzed dehydration reaction between GO and primary amine-containing small molecules. The nitrogen content in PN-GNs can easily be controlled over a wide range (3.27-15.28 wt%) by simple variation of the molar feed ratio of reactants. Furthermore, specific pyridinic nitrogen configurations, considered beneficial for the ORR process, can be incorporated into the PN-GNs. This results in the efficient structural restoration of graphene structures during the reaction. Therefore, these unique features of PN-GNs allow them to show superior electrocatalytic activities (high selectivity, excellent long-term stability and good tolerance to methanol crossover) toward the ORR in an alkaline electrolyte. ⓒ The Royal Society of Chemistry 2015
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