Observation of Ion Electrosorption in Metal–Organic Framework Micropores with In Operando Small‐Angle Neutron Scattering
Name
ANIE.201916201.pdf
Description
Accepted version
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2.36 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
He, Lilin
Yang, Luming
Dinca, Mircea
Zhang, Rui
Li, Jianlin
Date Issued
April 2020
Journal
Angewandte Chemie - International Edition
Publisher
Wiley
Citation
He, Lilin et al. "Observation of Ion Electrosorption in Metal–Organic Framework Micropores with In Operando Small‐Angle Neutron Scattering." Angewandte Chemie - International Edition 59, 24 (April 2020): 9773-9779 © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Version
Author's final manuscript
Abstract
A molecular-level understanding of transport and adsorption mechanisms of electrolyte ions in nanoporous electrodes under applied potentials is essential to control the performance of double-layer capacitors. Here, in operando small-angle neutron scattering (SANS) is used to directly detect ion movements into the nanopores of a conductive metal–organic framework (MOF) electrode under operating conditions. Neutron-scattering data reveals that most of the void space within the MOF is accessible to the solvent. Upon the addition of the electrolyte sodium triflate (NaOTf), the ions are adsorbed on the outer surface of the protrusions to form a 30 Å layer instead of entering the ionophobic pores in the absence of an applied charging potential. The changes in scattering intensity when potentials are applied suggests the ion rearrangement in the micropores following different mechanisms depending on the electrode polarization. These observations shed insights on ion electrosorption in electrode materials.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1002/anie.201916201
