| 학회 |
한국고분자학회 |
| 학술대회 |
2017년 가을 (10/11 ~ 10/13, 제주컨벤션센터) |
| 권호 |
42권 2호 |
| 발표분야 |
고분자구조 및 물성 |
| 제목 |
Size-Dependent N‑Doping and Oxygen Reduction Catalysis of Graphene Oxide by Size Selecting in Liquid Crystal State |
| 초록 |
Liquid crystalline property of Graphene Oxide (GO) in colloidal foam has gained considerable interest. Small flake size of GO can limit the mechanical and electrical properties of GO-based materials. Broad size and shape distribution of sonochemically exfoliated GO from graphite is also an unfortunate case. Here, after introduction of facile size selection of large-size GO, we have exploited liquid crystallinity and investigated the size-dependent N-doping and oxygen reduction catalysis. Spontaneous concentration of large-size GO flakes (＞20 μm) are observed within the liquid crystalline phase in biphasic GO dispersion. Dependency of N-dopant type on GO flake size is also observed with quaternary N-doping dominating in large-size GO. The lowest onset potential (-0.08 V) for oxygen reduction is also demonstrated by large-size GO as quaternary N-dopants serve as principal catalytic sites. |
| 저자 |
정홍주, 이경은, 임준원, 김상욱
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| 소속 |
한국과학기술원 |
| 키워드 |
graphene; liquid crystal; doping; oxygen reduction reaction; catalyst
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| E-Mail |
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