Can PTFE coating of gas diffusion layer improve the performance of URFCs in fuel cell-mode?

Shabani, B and Omrani, R 2019, 'Can PTFE coating of gas diffusion layer improve the performance of URFCs in fuel cell-mode?', Energy Procedia, vol. 160, no. 2019, pp. 574-581.


Document type: Journal Article
Collection: Journal Articles

Title Can PTFE coating of gas diffusion layer improve the performance of URFCs in fuel cell-mode?
Author(s) Shabani, B
Omrani, R
Year 2019
Journal name Energy Procedia
Volume number 160
Issue number 2019
Start page 574
End page 581
Total pages 8
Publisher Elsevier BV
Abstract Proton exchange membrane (PEM) unitised regenerative fuel cells (URFCs) combine the fuel cell (FC) and electrolyser functionalities in a single stack. The major performance challenge in URFCs is FC-mode operation due to the water management requirements. In this study, the effect of titanium-felt gas diffusion layer (GDL) hydrophobisation on FC-mode performance at low FC operating temperature (i.e. 30 °C) is investigated. Higher cell operating temperatures (i.e. ~70-80 °C) assist in water removal in vapour form and hence GDL hydrophobisation effect is not significant. Experimental results showed that a low amount of PTFE-coating improves the FC-performance at both low and high humidity conditions. It was observed that when FC temperature is relatively low, even dry conditions can result in flooding of the cell due to presence of more liquid water. Also, it was observed that hydrophobisation of Ti-GDL with PTFE emulsions with concentration of up to 10wt% PTFE does not have a noticeable effect on the cell ohmic resistance.
Subject Energy Generation, Conversion and Storage Engineering
Keyword(s) Gas Diffusion Layer
Unitised Regenerative Fuel Cell
Electrolyser
Hydrophobisation
Cell Temperature
PTFE
DOI - identifier 10.1016/j.egypro.2019.02.208
Copyright notice © 2019, the authors.
ISSN 1876-6102
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