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Issue 11, 2013
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B, N- and P, N-doped graphene as highly active catalysts for oxygen reduction reactions in acidic media

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Abstract

Graphene has been highlighted recently as a promising material for energy conversion due to its unique properties deriving from a two-dimensional layered structure of sp2-hybridized carbon. Herein, N-doped graphene (NGr) is developed for its application in oxygen reduction reactions (ORRs) in acidic media, and additional doping of B or P into the NGr is attempted to enhance the ORR performance. The NGr exhibits an onset potential of 0.84 V and a mass activity of 0.45 mA mg−1 at 0.75 V. However, the B, N- (BNGr) and P, N-doped graphene (PNGr) show onset potentials of 0.86 and 0.87 V, and mass activities of 0.53 and 0.80 mA mg−1, respectively, which are correspondingly 1.2 and 1.8 times higher than those of the NGr. Moreover, an additional doping of B or P effectively reduces the production of H2O2 in the ORRs, and shows much higher stability than that of Pt/C in acidic media. It is proposed that the improvement in the ORR activity results from the enhanced asymmetry of the spin density or electron transfer on the basal plane of the graphene, and the decrease in the energy gap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of the graphene through additional doping of B or P.

Graphical abstract: B, N- and P, N-doped graphene as highly active catalysts for oxygen reduction reactions in acidic media

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Supplementary files

Article information


Submitted
01 Nov 2012
Accepted
18 Jan 2013
First published
18 Jan 2013

J. Mater. Chem. A, 2013,1, 3694-3699
Article type
Paper

B, N- and P, N-doped graphene as highly active catalysts for oxygen reduction reactions in acidic media

C. H. Choi, M. W. Chung, H. C. Kwon, S. H. Park and S. I. Woo, J. Mater. Chem. A, 2013, 1, 3694
DOI: 10.1039/C3TA01648J

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