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Enhanced radical scavenging performance of Pt@CeO2 via strong metal-support interaction effect for improving durability of proton exchange membrane fuel cell.
- Source :
-
International Journal of Hydrogen Energy . Jan2024:Part C, Vol. 50, p41-51. 11p. - Publication Year :
- 2024
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Abstract
- Since scavenging free radical is regarded as an efficient strategy to enhance the durability of proton exchange membrane fuel cells (PEMFCs), strong metal-support interaction (SMSI) effect between metal and reducible oxide supports is employed as a strategy to moderate the number of accessible active sites for reduction-oxidation reaction. Enriched Pt–CeO 2 interface to enhance SMSI effect is achieved as well via constructing multicore-shell structure Pt@CeO 2. Theoretical calculation confirms that SMSI effect at Pt–CeO 2 interface endows electrons flowing from Pt to CeO 2 to reduce the formation energy of oxygen vacancies, while Pt@CeO 2 with higher magnitude of lattice distortion plan provides enriched Pt–CeO 2 interface that made more concentration of Ce3+ ions feasible. Results show that better free radical scavenging performance is achieved with higher concentration of Ce3+ ions in Pt@CeO 2. Based on the open circuit voltage (OCV) test, the Pt@CeO 2 -modified membrane in this work decays at only 70% of the commercial membrane, while 65% of the maximum power is still maintained after the test. This superior performance to the commercial membrane indicates this designed structure with SMSI effect could be considered as a potential route to solve the free radical problem in PEM for enhanced durability of PEMFCs. • Multicore-shell structure Pt@CeO 2 with enrich interfaces makes SMSI effect enhanced. • Results demonstrated that SMSI leads to a high concentration of Ce3+ ions in Pt@CeO 2. • OCV decay and power retention performances are superior than commercial PEMs. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03603199
- Volume :
- 50
- Database :
- Academic Search Index
- Journal :
- International Journal of Hydrogen Energy
- Publication Type :
- Academic Journal
- Accession number :
- 174184676
- Full Text :
- https://doi.org/10.1016/j.ijhydene.2023.08.013