In-plane channel-structured catalyst layer for polymer electrolyte membrane fuel cells

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In this study, we present a novel catalyst layer (CL) with in-plane flow channels to enhance the mass transports in polymer electrolyte membrane fuel cells. The CL with in-plane channels on its surface is fabricated by coating a CL slurry onto a surface-treated substrate with the inverse line pattern and transferring the dried CL from the substrate to a membrane. The membrane electrode assembly with the in-plane channel-patterned CL has superior power performances in high current densities compared with an unpatterned, flat CL, demonstrating a significant enhancement of the mass-transport property by the in-plane channels carved in the CL. The performance gain is more pronounced when the channel direction is perpendicular to the flow field direction, indicating that the in-plane channels increase the utilization of the CL under the rib area. An oxygen-transport resistance analysis shows that both molecular and Knudsen diffusion can be facilitated with the introduction of the in-plane channels. The direct CL patterning technique provides a platform for the fabrication of advanced CL structures with a high structural fidelity and design flexibility and a rational guideline for designing high-performance CLs.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-01
Language
English
Article Type
Article
Keywords

OXYGEN REDUCTION REACTION; INHOMOGENEOUS COMPRESSION; SOFT LITHOGRAPHY; CURRENT-DENSITY; POWER-SYSTEM; PEMFC; ELECTROCATALYSTS; PERFORMANCE; RESISTANCE; OPERATION

Citation

ACS APPLIED MATERIALS & INTERFACES, v.10, no.5, pp.4682 - 4688

ISSN
1944-8244
DOI
10.1021/acsami.7b16433
URI
http://hdl.handle.net/10203/240635
Appears in Collection
CBE-Journal Papers(저널논문)
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