4.8 Article

Self-assembled highly ordered acid layers in precisely sulfonated polyethylene produce efficient proton transport

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NATURE MATERIALS
卷 17, 期 8, 页码 725-+

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NATURE PUBLISHING GROUP
DOI: 10.1038/s41563-018-0097-2

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资金

  1. National Science Foundation (NSF) [DMR 1506726]
  2. NSF [PIRE 1545884, DMR 11-20901]
  3. Army Research Office [W911NF1310363, W911NF1310362]
  4. National Science Foundation [DMR1505778]
  5. Centre national de la recherche scientifique (CNRS) at the laboratoire des Systemes Moleculaires et nanoMateriaux pour l'Energie et la Sante in Grenoble, France (UMR-SyMMES (CNRS/CEA/Univ. Grenoble Alpes))
  6. Agence Nationale de le Recherche (ANR) [ANR-15-PIRE-0001-01, ANR-15-PIRE-0001-07]
  7. Rachleff Scholars Program of the University of Pennsylvania
  8. US Department of Energy's National Nuclear Security Administration [DE-NA-0003525]
  9. Army Research Office Defense University Research Instrumentation Program (ARO DURIP) grant [W911NF-14-1-0466]
  10. Synchrotron SOLEIL
  11. DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
  12. Direct For Mathematical & Physical Scien [1506726] Funding Source: National Science Foundation
  13. Division Of Materials Research [1505778] Funding Source: National Science Foundation

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Recent advances in polymer synthesis have allowed remarkable control over chain microstructure and conformation. Capitalizing on such developments, here we create well-controlled chain folding in sulfonated polyethylene, leading to highly uniform hydrated acid layers of subnanometre thickness with high proton conductivity. The linear polyethylene contains sulfonic acid groups pendant to precisely every twenty-first carbon atom that induce tight chain folds to form the hydrated layers, while the methylene segments crystallize. The proton conductivity is on par with Nafion 117, the benchmark for fuel cell membranes. We demonstrate that well-controlled hairpin chain folding can be utilized for proton conductivity within a crystalline polymer structure, and we project that this structure could be adapted for ion transport. This layered polyethylene-based structure is an innovative and versatile design paradigm for functional polymer membranes, opening doors to efficient and selective transport of other ions and small molecules on appropriate selection of functional groups.

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