High Performance Gas Diffusion Layer with Hydrophobic Nanolayer under a Supersaturated Operation Condition for Fuel Cells

Title
High Performance Gas Diffusion Layer with Hydrophobic Nanolayer under a Supersaturated Operation Condition for Fuel Cells
Authors
고태준김세훈홍보기이광렬오규환문명운
Keywords
gas diffusion layer; flooding; water condensation; hydrophobic coating; supersaturation
Issue Date
2015-03
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 7, NO 9, 5506-5513
Abstract
Reliable operation of a proton exchange membrane fuel cell requires proper water management to prevent water flooding in porous carbon materials such as the gas diffusion layer (GDL). In contrast to the conventional GDL that uses the "wet" dip-coating process with solvent and expensive polytetrafluoroethylene, we have proposed a novel GDL with a controlled hydrophobic silicone (i.e., hexamethyldisiloxane) nanolayer by a highly efficient and cost-effective "dry" deposition process. The GDL with the nanolayer exhibited an increased contact angle, decreased contact angle hysteresis, and suppressed water condensation. Even though the GDL with the nanolayer had a higher electrical resistance than the pristine GDL, the cell performance of the GDL with an optimum nanolayer thickness of 8.6 nm was practically the same as that of the pristine GDL under normal operating conditions. Under a supersaturated condition, the GDL with optimum nanolayer thickness exhibited much higher cell performance than the pristine GDL over all current densities due to enhanced hydrophobicity. Long-term operational stability and dynamic response of the GDL with the nanolayer were much improved over those of the pristine GDL.
URI
http://pubs.kist.re.kr/handle/201004/50734
ISSN
19448244
Appears in Collections:
KIST Publication > Article
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