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Park, Noejung
Computational Physics & Electronic Structure Lab.
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Facile, scalable synthesis of edge-halogenated graphene nanoplatelets as efficient metal-free eletrocatalysts for oxygen reduction reaction

Author(s)
Jeon, In-YupChoi, Hyun-JungChoi, MinSeo, Jeong-MinJung, Sun-MinKim, Min-JungZhang, ShengZhang, LipengXia, ZhenhaiDai, LimingPark, NoejungBaek, Jong-Beom
Issued Date
2013-06
DOI
10.1038/srep01810
URI
https://scholarworks.unist.ac.kr/handle/201301/2808
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84885460794
Citation
SCIENTIFIC REPORTS, v.3, pp.1810
Abstract
A series of edge-selectively halogenated (X = Cl, Br, I) graphene nanoplatelets (XGnPs = ClGnP, BrGnP, IGnP) were prepared simply by ball-milling graphite in the presence of Cl-2, Br-2 and I-2, respectively. High BET surface areas of 471, 579 and 662 m(2)/g were observed for ClGnP, BrGnP and IGnP, respectively, indicating a significant extent of delamination during the ball-milling and subsequent workup processes. The newly-developed XGnPs can be well dispersed in various solvents, and hence are solution processable. Furthermore, XGnPs showed remarkable electrocatalytic activities toward oxygen reduction reaction (ORR) with a high selectivity, good tolerance to methanol crossover/CO poisoning effects, and excellent long-term cycle stability. First-principle density-functional calculations revealed that halogenated graphene edges could provide decent adsorption sites for oxygen molecules, in a good agreement with the experimental observations.
Publisher
NATURE PUBLISHING GROUP
ISSN
2045-2322
Keyword
WALLED CARBON NANOTUBESCATALYST-FREE SYNTHESISFREE ELECTROCATALYSTSDOPED GRAPHENEGRAPHITE OXIDEFUEL-CELLSNITROGENNANOMATERIALSNANOSHEETSIRON

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