| 학회 |
한국고분자학회 |
| 학술대회 |
2013년 봄 (04/11 ~ 04/12, 대전컨벤션센터) |
| 권호 |
38권 1호 |
| 발표분야 |
고분자가공/복합재료 |
| 제목 |
Edge-Selectively Sulfurized Graphene Nanoplatelets as Efficient Metal-Free Electrocatalysts for Oxygen Reduction Reaction: The Electron Spin Effect |
| 초록 |
To replace precious Pt-based electrocatalysts for cathodic oxygen reduction reaction (ORR), we have synthesized the edge-selectively-sulfurized graphene nanoplatelets (SGnP) as efficient metal-free electrocatalysts simply by ball-milling the pristine graphite in the presence of sulfur (S8). The resultant SGnP exhibits remarkable electrocatalytic activity toward ORR with better tolerance to methanol crossover effect, and longer-term stability than those of the pristine graphite and commercial Pt/C electrocatalysts. Density functional theory (DFT) calculations suggested that the sulfurization at the edges of graphene introduced asymmetric electron spin, which made the SGnP possible for high ORR activity, in addition to generally considered charge densities. The DFT calculation further predicted improved ORR activity from oxidized version of SGnP (SOGnP), which was expected and experimentally confirmed to increase both spin and charge densities. |
| 저자 |
전인엽1, Sheng Zhang2, Lipeng Zhang2, 최현정1, 서정민1, Zhenhai Xia3, 백종범1
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| 소속 |
1울산과학기술대, 2Case Western Reserve Univ., 3Univ. of North Texas |
| 키워드 |
Graphene; metal-free; oxygen reduction reaction
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| E-Mail |
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