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Pore-scale study of...
Pore-scale study of effects of relative humidity on reactive transport processes in catalyst layers in PEMFC
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- Zhang, R. (författare)
- Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Shaanxi, Xi'an, China
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- Min, T. (författare)
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Shaanxi, Xi'an, China
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- Chen, L. (författare)
- Engineering, Xi'an Jiaotong University, Shaanxi, Xi'an, China
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- Li, Hailong, 1976- (författare)
- Mälardalens universitet,Framtidens energi
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- Yan, Jinyue, 1959- (författare)
- Mälardalens universitet,Framtidens energi
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- Tao, W. -Q (författare)
- Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Shaanxi, Xi'an, China
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(creator_code:org_t)
- Elsevier Ltd, 2022
- 2022
- Engelska.
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Ingår i: Applied Energy. - : Elsevier Ltd. - 0306-2619 .- 1872-9118. ; 323
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- High surface area carbon (HSC) particles can be adopted to increase the specific surface area of catalyst layer (CL) in proton exchange membrane fuel cells. Relative humidity (RH) has a significant effect on the Pt activity inside HSC particles, and the underlying mechanisms need to be further investigated. In this study, a pore-scale model considering the effects of RH on the reactive transport processes inside the CLs is developed. Two kinds of liquid water distributions affected by the RH, including capillary condensation in pores and ultra-thin liquid film on Pt surface, are considered. The liquid water distribution, Pt activity and local oxygen transport resistance (Rlocal) under different RH are studied in detail. It is found that as RH increases from 0.3 to 1.0, the condensed water in micropores of HSC particles increases, resulting in an increase in reactive surface area by about 43 %. Combined effect of the RH, Pt loading, I/C ratio and different kinds of carbon particles is investigated. It is found that due to the lack of sufficient reaction sites, compared with that under a high Pt loading, Rlocal under a low Pt loading is more sensitive to the RH. Besides, since the Pt activity inside HSC particles depends on the condensed water, the Rlocal of HSC particles is more sensitive to the RH than solid carbon particles. Finally, the Rlocal at low ionomer content is more sensitive to RH due to low ionomer coverage on Pt particles. The present study provides a pore-scale model for investigating the coupled effects of RH and CL porous structures on local transport processes, and can facilitate the optimization of CL nanoscale structures for better cell performance.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik -- Annan naturresursteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering -- Other Environmental Engineering (hsv//eng)
Nyckelord
- Capillary condensation
- Catalyst layer
- High surface area carbon
- Local transport resistance
- Low platinum loading
- Carbon
- Catalysts
- Condensation
- Liquid films
- Platinum
- Proton exchange membrane fuel cells (PEMFC)
- Water supply systems
- Carbon particle
- Catalysts layers
- High surface area
- Local transport
- Platinum loadings
- Transport resistance
- Ionomers
- catalyst
- fuel cell
- ion exchange
- membrane
- optimization
- reactive transport
- relative humidity
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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