Selective Vapor Pressure Dependent Proton Transport in a Metal–Organic Framework with Two Distinct Hydrophilic Pores
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paper71.pdf
Description
Accepted version
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2.2 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Park, Sarah Sunah
Rieth, Adam Joseph
Hendon, Christopher H
Dinca, Mircea
Date Issued
February 2018
Journal
Journal of the American Chemical Society
Publisher
American Chemical Society (ACS)
Citation
Park, Sarah S., et al. "Selective Vapor Pressure Dependent Proton Transport in a Metal-Organic Framework with Two Distinct Hydrophilic Pores." Journal of the American Chemical Society 140, 6 (Feb. 2018): p. 2016-19 doi 10.1021/JACS.7B12784 ©2018 Author(s)
Version
Author's final manuscript
Abstract
The mechanism of proton conductivity in porous solids (i.e., Grotthuss or vehicular) is related to the structure and chemical environment of the pores. Direct observation of structure-function relationships is difficult because state-of-the-art solid proton conductors are often amorphous. Here, we present a systematic elucidation of two distinct proton transport pathways within MIT-25, a mesoporous metal-organic framework that exhibits parallel channels of ∼27 Å and ∼4.5 Å width. We characterize transport through these pores using temperature- and humidity-dependent proton conductivity measurements and density functional theory. Through control of vapor pressure we are able to sequentially fill the small and large pores, promoting proton conductivity with distinct activation energies at low and high relative humidity, respectively.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1021/JACS.7B12784
