연료전지 촉매층 내 촉매활성도에 대한 탄소지지 백금 촉매의 기하학적 비등방성 효과에 관한 연구Geometrically Inhomogeneous Random Configuration Effects of Pt/C Catalysts on Catalyst Utilization in PEM Fuel Cells
- Other Titles
- Geometrically Inhomogeneous Random Configuration Effects of Pt/C Catalysts on Catalyst Utilization in PEM Fuel Cells
- Authors
- 신승호; 김아름; 정혜미; 엄석기
- Issue Date
- Oct-2014
- Publisher
- 한국정밀공학회
- Keywords
- Polymer electrolyte membrane fuel cell (PEMFC); Cathode catalyst layer (환원극 촉매); Transport phenomena (전달현상); Percolation model (스미기 모델); Electrochemically active surface area (전기화학적 활성표면)
- Citation
- 한국정밀공학회지, v.31, no.10, pp.955 - 965
- Indexed
- KCI
- Journal Title
- 한국정밀공학회지
- Volume
- 31
- Number
- 10
- Start Page
- 955
- End Page
- 965
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/158907
- DOI
- 10.7736/KSPE.2014.31.10.955
- ISSN
- 1225-9071
- 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.
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