Journal
NATURE ENERGY
Volume 2, Issue 11, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41560-017-0018-7
Keywords
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Funding
- National Natural Science Fund for Innovative Research Groups [51621003]
- Natural Science Foundation of China [21576006, 21606006]
- Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions [CITTCD20150309]
- Welch Foundation [AX-1730]
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The design of stable electrolyte materials with high proton conductivity for use in proton exchange membrane fuel cells remains a challenge. Most of the materials explored have good conductivity at high relative humidity (RH), but significantly decreased conductivity at reduced RH. Here we report a chemically stable and structurally flexible metal-organic framework (MOF), BUT-8(Cr) A, possessing a three-dimensional framework structure with one-dimensional channels, in which high-density sulfonic acid (-SO3H) sites arrange on channel surfaces for proton conduction. We propose that its flexible nature, together with its-SO3H sites, could allow BUT-8(Cr) A to self-adapt its framework under different humid environments to ensure smooth proton conduction pathways mediated by water molecules. Relative to other MOFs, BUT-8(Cr) A not only has a high proton conductivity of 1.27 x 10(-1) S cm(-1) at 100% RH and 80 degrees C but also maintains moderately high proton conductivity at a wide range of RH and temperature.
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