Groves, TS;
Perez-Martinez, CS;
Lhermerout, R;
Perkin, S;
(2021)
Surface Forces and Structure in a Water-in-Salt Electrolyte.
The Journal of Physical Chemistry Letters
, 12
(6)
pp. 1702-1707.
10.1021/acs.jpclett.0c03718.
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Abstract
Water-in-salt electrolytes are a fascinating new class of highly concentrated aqueous solutions with wide electrochemical stability windows that make them viable as aqueous battery electrolytes. However, the high ion concentration of water-in-salt electrolytes means that these systems are poorly understood when compared to more dilute electrolyte solutions. Here, we present direct surface force measurements across thin films of a water-in-salt electrolyte at several concentrations. We find that the electrolyte adopts a layered structure at charged interfaces composed of a nanostructure of a hydrated cation and nonaqueous anion-rich domains. These observations will aid in the interpretation of capacitance and double-layer behavior of water-in-salt electrolytes with consequences for their use in energy storage devices.
| Type: | Article |
|---|---|
| Title: | Surface Forces and Structure in a Water-in-Salt Electrolyte |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acs.jpclett.0c03718 |
| Publisher version: | https://doi.org/10.1021/acs.jpclett.0c03718 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Anions, Layers, Cations, Electrolytes, Ions |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10122517 |
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