Carbon nanotube modified carbon fiber for polymer composite bipolar plates
- 주제(키워드) bipolar plate , carbon nanotube , carbon fiber , polymer composite
- 발행기관 고려대학교 대학원
- 지도교수 임대순
- 발행년도 2011
- 학위수여년월 2011. 2
- 학위구분 석사
- 학과 일반대학원 신소재공학과
- 세부전공 신소재공학 전공
- 원문페이지 64 p
- 실제URI http://www.dcollection.net/handler/korea/000000025275
- 본문언어 영어
- 제출원본 000045640972
초록/요약
Abstract In composite bipolar plate system, the sufficient electrical conductivity for being applied in the bipolar plate gets accomplished in the quite high filler concentration and it lowering the mechanical strength. The fiber reinforcement is needed in order to increase the mechanical strength. However, this lowers the conductivity once again. In this study, the carbon nanotube (CNT) grown carbon fibers were added in graphite composites in order to increase the mechanical strength and conductivity together. The multiwalled CNTs were grown by catalytic decomposition of acetylene using chemical vapor deposition at 700 oC. Since being a strong connection between fiber and the graphite or the polymer matrix, the high electrical conductivity and flexural strength is maintained by CNTs grown up. The through-plane resistance and flexural strength indicated 14 mΩ cm2 and 36.7 MPa which about 30 % and 18 % is improved in 7 wt.% content of the CNTs grown carbon fiber compared with the non-grown fiber reinforced composite. The single cell test showed that the CNTs on carbon fiber contribute improved electrical conductivity as well as the power density of the cell.
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Contents
Abstract.............................................................................................................i
List of Figures and Tables...............................................................................iv
Chapter I - Introduction.........................................................................1
1. Motivation......................................................................................1
2. Thesis overview..............................................................................3
Chapter II - Theoretical Background................................................5
1. Bipolar plates in proton exchange membrane fuel cell.................5
1.1 Operation of proton exchange membrane fuel cell..............5
1.2 Functions of bipolar plates.................................................12
1.3 Bipolar plate materials.......................................................12
1.3.1 Metal bipolar plate.................................................13
1.3.2 Composite bipolar plate.........................................17
1.3.3 Carbon composite bipolar plate.............................20
Chapter III - Experimental Procedure...........................................22
1. Materials......................................................................................22
2. Surface treatment of carbon fiber................................................22
3. Synthesis of carbon nanotubes.....................................................23
4. Fabrication of composites...........................................................24
5. Measure and Analyses.................................................................27
Chapter IV - Results and Discussion...............................................30
1. Surface morphology of carbon fibers and their surface treatments...30
2. Structure of CNTs grown carbon fibers and their composite.............34
3. Through plane resistance...................................................................39
4. Flexural strength................................................................................43
5. Single cell performance......................................................................47
Chapter V - Conclusion........................................................................50
References..................................................................................................51
