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A flexible metal–organic framework with a high density of sulfonic acid sites for proton conduction

Author

Listed:
  • Fan Yang

    (Beijing University of Technology)

  • Gang Xu

    (Chinese Academy of Sciences)

  • Yibo Dou

    (Beijing University of Technology)

  • Bin Wang

    (Beijing University of Technology)

  • Heng Zhang

    (Beijing University of Technology)

  • Hui Wu

    (National Institute of Standards and Technology)

  • Wei Zhou

    (National Institute of Standards and Technology)

  • Jian-Rong Li

    (Beijing University of Technology)

  • Banglin Chen

    (Fujian Normal University
    University of Texas at San Antonio)

Abstract

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 × 10−1 S cm−1 at 100% RH and 80 °C but also maintains moderately high proton conductivity at a wide range of RH and temperature.

Suggested Citation

  • Fan Yang & Gang Xu & Yibo Dou & Bin Wang & Heng Zhang & Hui Wu & Wei Zhou & Jian-Rong Li & Banglin Chen, 2017. "A flexible metal–organic framework with a high density of sulfonic acid sites for proton conduction," Nature Energy, Nature, vol. 2(11), pages 877-883, November.
    • Handle: RePEc:nat:natene:v:2:y:2017:i:11:d:10.1038_s41560-017-0018-7
    DOI: 10.1038/s41560-017-0018-7
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