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나노물질 및 화학반응 연구단
나노물질 및 화학반응 연구단
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Liquid Crystal Size Selection of Large-Size Graphene Oxide for Size-Dependent N-Doping and Oxygen Reduction Catalysis

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Title
Liquid Crystal Size Selection of Large-Size Graphene Oxide for Size-Dependent N-Doping and Oxygen Reduction Catalysis
Author(s)
Kyung Eun Lee; Ji Eun Kim; Uday Narayan Maiti; Joonwon Lim; Jin Ok Hwang; Jongwon Shim; Jung Jae Oh; Taeyeong Yun; Sang Ouk Kim
Publication Date
2014-09
Journal
ACS Nano, v.8, no.9, pp.9073 - 9080
Publisher
AMER CHEMICAL SOC
Abstract
Graphene oxide (GO) is aqueous-dispersible oxygenated graphene, which shows colloidal discotic liquid crystallinity. Many properties of GO-based materials, including electrical conductivity and mechanical properties, are limited by the small flake size of GO. Unfortunately, typical sonochemical exfoliation of GO from graphite generally leads to a broad size and shape distribution. Here, we introduce a facile size selection of large-size GO exploiting liquid crystallinity and investigate the size-dependent N-doping and oxygen reduction catalysis. In the biphasic GO dispersion where both isotropic and liquid crystalline phases are equilibrated, large-size GO flakes (>20 mu m) are spontaneously concentrated within the liquid crystalline phase. N-Doping and reduction of the size-selected GO exhibit that N-dopant type is highly dependent on GO flake size. Large-size GO demonstrates quaternary dominant N-doping and the lowest onset potential (-0.08 V) for oxygen reduction catalysis, signifying that quaternary N-dopants serve as principal catalytic sites in N-doped graphene (C) 2014 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/4862
ISSN
1936-0851
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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