期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 1, 页码 806-815出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c21176
关键词
electrospray deposition; dendritic structure; radical scavenger; CeO2 nanoparticle; polymer electrolyte membrane fuel cell
资金
- Global Frontier R&D Program of the Center for Multiscale Energy Systems - NRF, Korea [2012M3A6A7054855]
- National Research Foundation of Korea (NRF) [2019R1C1C1004462]
- Hanbat National University
- KIST institutional program [2E30380]
- National Research Foundation of Korea [2019R1C1C1004462] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The introduction of multifunctional dendritic Nafion/CeO2 structures improved the performance of PEMFCs by enlarging the interfacial contact area and forming microscale voids, while also mitigating free-radical attack on the membrane.
The development of a novel approach to achieve high-performance and durable fuel cells is imperative for the further commercialization of proton-exchange (or polymer electrolyte) membrane fuel cells (PEMFCs). In this work, multifunctional dendritic Nafion/CeO2 structures were introduced onto the cathode side of the interface between a membrane and a catalyst layer through electrospray deposition. The dendritic structures enlarged the interfacial contact area between the membrane and the catalyst layer and formed microscale voids between the catalyst layer and gas diffusion medium. This improved the PEMFC performance through the effective utilization of the catalyst and enhanced mass transport of the reactant. Especially, under low-humidity conditions, the hygroscopic effect of CeO2 nanoparticles also boosted the power density of PEMFCs. In addition to the beneficial effects on the efficiency of the PEMFC, the incorporation of CeO2, widely known as a radical scavenger, effectively mitigated the free-radical attack on the outer surface of the membrane, where chemical degradation is initiated by radicals formed during PEMFC operation. These multifunctional effects of the dendritic Nafion/CeO2 structures on PEMFC performance and durability were investigated using various in situ and ex situ measurement techniques.
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