Facile, scalable synthesis of edge-halogenated graphene nanoplatelets as efficient metal-free eletrocatalysts for oxygen reduction reaction
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- Facile, scalable synthesis of edge-halogenated graphene nanoplatelets as efficient metal-free eletrocatalysts for oxygen reduction reaction
- Jeon, In-Yup; Choi, Hyun-Jung; Choi, Min; Seo, Jeong-Min; Jung, Sun-Min; Kim, Min-Jung; Zhang, Sheng; Zhang, Lipeng; Xia, Zhenhai; Dai, Liming; Park, Noejung; Baek, Jong-Beom
- Electrocatalysis; Fuel cells; Synthesis and processing; Synthesis of graphene
- Issue Date
- NATURE PUBLISHING GROUP
- SCIENTIFIC REPORTS, v.3, no., pp.1810 -
- 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.
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