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Observation of active sites for oxygen reduction reaction on nitrogen-doped multilayer graphene

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journal contribution
posted on 22.07.2014, 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) Chen
Active 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 Nano

Volume

8

Issue

7

Pagination

6856 - 6862

Publisher

ACS Publications

Location

Washington DC

eISSN

1936-086X

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2014, American Chemical Society