Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 640, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2021.119818
Keywords
Lamellar membranes; Carrier arrangement; Thermal rearrangement-electrostatic induction strategy; Proton conduction; Hydrogen fuel cell
Categories
Funding
- National Natural Science Foundation of China [U2004199]
- Excellent Youth Foundation of Henan Province [202300410373]
- China Postdoctoral Science Foundation [2021T140615, 2020M672281]
- Natural Science Foundation of Henan Province [212300410285]
- Young Talent Support Project of Henan Province [2021HYTP028]
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Recent research has shown that arranging carriers in confined channels can improve the performance of ion-conducting membranes, potentially paving the way for the rational design of high-efficiency membrane materials.
Recent findings highlight the unique superiority of two-dimensional lamellar membranes in ion transport through the well-defined and stable interlayer channels. However, undesired channel chemical environment, such as low carrier density and random distribution, greatly limits their development as proton-conducting membranes. Herein, Nafion intercalated polydopamine-modified graphene oxide (ND-D) membranes are prepared, followed by thermal rearrangement-electrostatic induction to manipulate -SO3H group arrangement in interlayer channels. Experiments and molecular dynamics simulations demonstrate the specific process mechanism of carrier rearrangement: heat treatment promotes the movement of Nafion chains, and then induces their acid groups to enrich near the -NH2/-NH- groups on channel wall. Such carrier arrangement creates efficient and stable interfacial channels for proton conduction. This novel membrane, therefore, achieves the proton conductivity of 309 and 55.4 mS cm(-1) under 100% and 40% RH, respectively, outclassing those of benchmark Nafion membrane. This further permits a 130% improvement in hydrogen fuel cell performance. Meanwhile, the carrier rearrangement imparts over two times' enhancement in interlayer interaction and hence obviously enhanced membrane stability. Furthermore, a similar sulfonated poly(ether ether ketone) intercalated lamellar membrane is prepared to prove the universality of this strategy. The elaboration of carrier rearrangement in confined channels may pave a way for the rational design of high-efficiency membrane materials.
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