Coating a reinforced composite membrane with a hydrophilic Pt layer can substantially improve the durability of polymer membranes used in fuel cell applications. In this study, we investigated the performance and durability of Aquivion/expanded polytetrafluoroethylene (ePTFE)-reinforced composite membranes with varying Pt contents. We introduced a Pt coating onto ePTFE via magnetron sputtering and characterized the Pt layer using scanning electron microscopy and X-ray photoelectron spectroscopy. As the amount of Pt coating increased, the surface of ePTFE became more hydrophilic; thus, the Pt-impregnated composite membrane was better than the bare composite membrane. We evaluated the fuel cell performance through a single-cell test following membrane electrode assembly fabrication, and performed an accelerated degradation test by maintaining the cell at an open circuit voltage at 90 °C and low humidity (30% relative humidity) for 144 h. Compared to the pure composite membrane, the Pt-coated composite membrane showed less degradation and a lower fluorine emission rate. These results indicated that Pt-coated composite membranes are potentially suitable candidates for use in proton exchange membrane fuel cells.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2019R1A2C2003054 ). This work was also supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) ( 20213030030040 ).
© 2023 Elsevier B.V.
- Fuel cell
- Proton exchange membrane fuel cell
- Reinforced composite membrane
ASJC Scopus subject areas
- General Materials Science
- Physical and Theoretical Chemistry
- Filtration and Separation