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    Rights statement: This is the author’s version of a work that was accepted for publication in Solid State Nuclear Magnetic Resonance. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solid State Nuclear Magnetic Resonance, 89, 2018 DOI: 10.1016/j.ssnmr.2017.10.003

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Selective observation of charge storing ions in supercapacitor electrode materials

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<mark>Journal publication date</mark>02/2018
<mark>Journal</mark>Solid State Nuclear Magnetic Resonance
Volume89
Number of pages5
Pages (from-to)45-49
StatePublished
Early online date4/11/17
Original languageEnglish

Abstract

Nuclear magnetic resonance (NMR) spectroscopy has emerged as a useful technique for probing the structure and dynamics of the electrode-electrolyte interface in supercapacitors, as ions inside the pores of the carbon electrodes can be studied separately from bulk electrolyte. However, in some cases spectral resolution can limit the information that can be obtained. In this study we address this issue by showing how cross polarisation (CP) NMR experiments can be used to selectively observe the in-pore ions in supercapacitor electrode materials. We do this by transferring magnetisation from 13C nuclei in porous carbons to nearby nuclei in the cations (1H) or anions (19F) of an ionic liquid. Two-dimensional NMR experiments and CP kinetics measurements confirm that in-pore ions are located within Ångströms of sp2-hybridised carbon surfaces. Multinuclear NMR experiments hold promise for future NMR studies of supercapacitor systems where spectral resolution is limited.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Solid State Nuclear Magnetic Resonance. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solid State Nuclear Magnetic Resonance, 89, 2018 DOI: 10.1016/j.ssnmr.2017.10.003