Journal
JOURNAL OF POWER SOURCES
Volume 506, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230039
Keywords
PEM fuel Cells; Roll-to-roll coating; Gas diffusion electrodes; Slot die coating
Funding
- U.S. Department of Energy (DOE) [DE-AC3608GO28308]
- U.S. Department of Energy Office of Science laboratory [DE-AC02-06CH11357]
- DOE Office of Science [DE-AC02 06CH11357]
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office
- Hydrogen and Fuel Cell Technologies Office
- NSF PFI-RP [1919280]
- Colorado Energy Research Collaboratory
- National Science Foundation [1626619]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1626619] Funding Source: National Science Foundation
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1919280] Funding Source: National Science Foundation
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This study focuses on determining fabrication conditions to create high-performance roll-to-roll-coated gas-diffusion electrodes for proton-exchange-membrane fuel cells. It was found that using a higher drying rate can promote the formation of an ionomer-rich surface in the electrode. The R2R-coated GDEs have a higher surface ionomer concentration than spray-coated GDEs, eliminating the need for an additional ionomer overlayer and reducing processing steps and manufacturing costs.
This study focuses on determining fabrication conditions to create high-performance roll-to-roll-coated (R2Rcoated) gas-diffusion electrodes (GDEs) for proton-exchange-membrane fuel cells (PEMFCs). Here, we examine how process conditions influence the distribution of ionomer in the electrode, which is shown to be critical for high performance. Using a combination of Kelvin probe, X-ray photoelectron spectroscopy, and nano-scale X-ray computed tomography we show that formation of an ionomer-rich surface is promoted by using a higher drying rate. We show that R2R-coated GDEs have higher surface ionomer concentration than spray-coated GDEs, which enables these R2R-coated GDEs to not need an additional ionomer overlayer, as is typically the case for spraycoated GDEs. This will reduce the number of processing steps and lower material costs in a manufacturing setting. This work shows that with the appropriate selection of materials, ink formulation, and processing conditions, direct-coated GDEs are a viable pathway for fuel cell manufacturing.
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