xing-observation-of-active-2014.pdf (4.72 MB)
Observation of active sites for oxygen reduction reaction on nitrogen-doped multilayer graphene
journal contribution
posted on 2014-07-22, 00:00 authored by T Xing, Y Zheng, Luhua LiLuhua Li, B C Cowie, Daniel Gunzelmann, S Z Qiao, S Huang, Ying (Ian) ChenYing (Ian) ChenActive sites and the catalytic mechanism of nitrogen-doped graphene in an oxygen reduction reaction (ORR) have been extensively studied but are still inconclusive, partly due to the lack of an experimental method that can detect the active sites. It is proposed in this report that the active sites on nitrogen-doped graphene can be determined via the examination of its chemical composition change before and after ORR. Synchrotron-based X-ray photoelectron spectroscopy analyses of three nitrogen-doped multilayer graphene samples reveal that oxygen reduction intermediate OH(ads), which should chemically attach to the active sites, remains on the carbon atoms neighboring pyridinic nitrogen after ORR. In addition, a high amount of the OH(ads) attachment after ORR corresponds to a high catalytic efficiency and vice versa. These pinpoint that the carbon atoms close to pyridinic nitrogen are the main active sites among the different nitrogen doping configurations.
History
Journal
ACS NanoVolume
8Issue
7Pagination
6856 - 6862Publisher
ACS PublicationsLocation
Washington DCPublisher DOI
Link to full text
eISSN
1936-086XLanguage
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2014, American Chemical SocietyUsage metrics
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fuel cellsnitrogen-doped (N-doped) grapheneoxygen reduction reactionsX-ray photoelectron spectroscopyScience & TechnologyPhysical SciencesTechnologyChemistry, MultidisciplinaryChemistry, PhysicalNanoscience & NanotechnologyMaterials Science, MultidisciplinaryChemistryScience & Technology - Other TopicsMaterials ScienceGRAPHITE OXIDEFUEL-CELLSALLOY CATHODECATALYSTSELECTROCATALYSISFUNCTIONALITIESELECTRODESPYROLYSISCOMPOSITEMECHANISMHIGH ELECTROCATALYTIC ACTIVITY
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