Observation of Ion Electrosorption in Metal–Organic Framework Micropores with In Operando Small-Angle Neutron Scattering

He, Lilin; Yang, Luming; Dinca, Mircea; Zhang, Rui; Li, Jianlin

doi:10.1002/ange.201916201

Title: Observation of Ion Electrosorption in Metal–Organic Framework Micropores with In Operando Small-Angle Neutron Scattering

Journal Article · 11 March 2020 · Angewandte Chemie

DOI: https://doi.org/10.1002/ange.201916201 · OSTI ID:1649585

^[1]; Yang, Luming ^[2]; Dinca, Mircea ^[2]; Zhang, Rui ^[3];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Pennsylvania State Univ., University Park, PA (United States)

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. In this paper, 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1649585

Journal Information:: Angewandte Chemie, Vol. 132, Issue 24; ISSN 0044-8249

Publisher:: German Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
electrosorption
metal–organic frameworks
microporous materials
small-angle neutron scattering
supercapacitors

Title: Observation of Ion Electrosorption in Metal–Organic Framework Micropores with In Operando Small-Angle Neutron Scattering

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