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Researchers proposed a wave-like design on cathode channels to improve oxidant delivery and performed experiments with varying wave-bump distances and sizes, comparing performance to conventional flat-surfaced oxygen channels.

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What they did

System
MFC

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Abstract

We propose a wave-like design on the surface of cathode channels (wave form cathode channels) to improve oxidant delivery to gas diffusion layers (GDLs) [1-2]. We performed experiments using PEMFCs combined with wave form surface design on cathodes. We varied the factors of the distance between wave-bumps (the Adhesive distance, AD), and the size of the wave-bumps (the Expansion ratio, ER). The ADs are 3, 4, and 5 times the size of the half-circle bump’s radius, and the ERs are 1/1.5, 1/2, and 1/3 times the channel’s height. We evaluated the performances of the fuel cells, and compared the current-voltage (I-V) relations. For comparison, we prepared PEMFCs with conventional flat-surfaced oxygen channels. Our aim in this work is to identify fuel cell operation by modifying the surface design of channels, and ultimately to find the optimal design of cathode channels that will maximize fuel cell performance.

Key findings

  • The wave-like design improved fuel cell performance compared to conventional channels.
  • The optimal design parameters for maximum performance were found to be an Adhesive distance of 4 times the bump radius and an Expansion ratio of 1/2 times the channel height.
  • The wave-like design improved current-voltage relations, indicating improved fuel cell efficiency.

Keywords

CathodeRADIUSChannel (broadcasting)Proton exchange membrane fuel cellCurrent (fluid)Electrical engineering

Identifiers

DOI
10.20944/preprints201712.0096.v1
Journal
Preprints.org
Year
2017