연료전지 촉매층 내 촉매활성도에 대한 탄소지지 백금 촉매의 기하학적 비등방성 효과에 관한 연구
- Title
- 연료전지 촉매층 내 촉매활성도에 대한 탄소지지 백금 촉매의 기하학적 비등방성 효과에 관한 연구
- Author
- 엄석기
- Keywords
- 환원극 촉매; 전달현상; 스미기 모델; 전기화학적 활성표면; Polymer electrolyte membrane fuel cell (PEMFC); Cathode catalyst layer; Transport phenomena; Percolation model; Electrochemically active surface area
- Issue Date
- 2014-10
- Publisher
- 한국정밀공학회
- Citation
- 한국정밀공학회지 / Journal of the Korean Society of Precision Engineering. 2014, 31(10), P.955-965
- Abstract
- Transport phenomena of reactant and product are directly linked to intrinsic inhomogeneous random configurations of catalyst layer (CL) that consist of ionomer, carbon-supported catalyst (Pt/C), and pores. Hence, electrochemically active surface area (ECSA) of Pt/C is dominated by geometrical morphology of mass transport path. Undoubtedly these ECSAs are key factor of total fuel cell efficiency. In this study, non-deterministic micro-scale CLs were randomly generated by Monte Carlo method and implemented with the percolation process. To ensure valid inference about Pt/C catalyst utilization, 600 samples were chosen as the number of necessary samples with 95% confidence level. Statistic results of 600 samples generated under particular condition (20vol% Pt/C, 30vol% ionomer, 50vol% pore, and 20nm particle diameter) reveal only 18.2%~81.0% of Pt/C can construct ECSAs with mean value of 53.8%. This study indicates that the catalyst utilization in fuel cell CLs cannot be identical notwithstanding the same design condition.
- URI
- http://www.dbpia.co.kr/Journal/ArticleDetail/NODE02481567
- ISSN
- 1225-9071; 1226-9071
- DOI
- 10.7736/KSPE.2014.31.10.955
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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