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제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Carbon based catalysts containing transition metal-nitrogen moieties for efficient oxygen reduction reaction

등록일
2015년 9월 11일 13시 42분 44초
접수번호
1413
발표코드
ENVR2-4 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 10시 : 25분
발표형식
심포지엄
발표분야
환경에너지 - Fuel Cell Based Energy Conversion Systems
저자 및
공동저자
조은애
한국과학기술원(KAIST) 신소재공학과, Korea
Recent major effort in fuel cells for automotive applications has been exploring cheap and active non-precious metal catalyst for the oxygen reduction reaction (ORR). Since Jasinski reported macrocyclic Co-phthalocyanine as an ORR electrocatalyst, non-precious metal catalysts containing transition metal-Nx moieties (M-N-C) have attracted continuing interest because these catalysts consist of earth-abundant substances. Recent studies revealed that the M-N-C catalysts have potential to replace platinum (Pt) catalyst due to their high ORR activity and low cost. To achieve high ORR activity, work on M-N-C catalysts has mainly focused on optimization of the synthesis process considering various precursor mixture. Although the ORR activity of the M-N-C catalyst strongly depends on the precursor selection, a large surface area is always a prerequisite for a high reaction volume. From this perspective, a nanostructure is a very attractive morphology to attain a high surface area. Herein we report two types of nanostructured M-N-C catalyst for ORR using facile synthesis route; 1) electrospun cobalt-carbon nanofiber (Co-CNF), and 2) mechanically activated iron-nitrogen-sulfur doped-graphene (Fe-N-S-graphene). These two catalysts have 1-dimensinal and very porous nanostrucure, respectively, and exhibits high ORR activity and stability in alkaline media compared with the commercial Pt/C catalyst. The high ORR activity is attributed from increase in ORR active sites. We focused on structural characteristics being associated with the ORR active sites such as doped N, S, graphitic carbon structure and surface area. By investigating the correlation between the structural variation and ORR activity, we aim to elucidate the ORR active sites of the Co-CNF and Fe-N-S-graphene catalyst for designing highly active NPMCs to replace Pt catalyst.

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