Unconventional interfacial water structure of highly concentrated aqueous electrolytes at negative electrode polarizations.

ABSTRACT: Water-in-salt electrolytes are an appealing option for future electrochemical energy storage devices due to their safety and low toxicity. However, the physicochemical interactions occurring at the interface between the electrode and the water-in-salt electrolyte are not yet fully understood. Here, via in situ Raman spectroscopy and molecular dynamics simulations, we investigate the electrical double-layer structure occurring at the interface between a water-in-salt electrolyte and an Au(111) electrode. We demonstrate that most interfacial water molecules are bound with lithium ions and have zero, one, or two hydrogen bonds to feature three hydroxyl stretching bands. Moreover, the accumulation of lithium ions on the electrode surface at large negative polarizations reduces the interfacial

SUBMITTER: Li CY 

PROVIDER: S-EPMC9464189 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature