Are SAXS and SANS suitable to extract information on the role of water for electric double-layer formation at the carbon - aqueous electrolyte interface?

Malina Seyffertitz, Sebastian Stock, Max Rauscher, Christian Prehal, Sylvio Haas, Lionel Porcar, Oskar Paris

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

Abstract

This study reports on the applicability of X-ray transmission (XRT), small- and wide-angle X-ray scattering (SAXS/WAXS) and small-angle neutron scattering (SANS) for investigating fundamental processes taking place in the working electrode of an electric double-layer capacitor with 1M RbBr aqueous electrolyte at different applied potentials. XRT and incoherent neutron scattering are employed to determine global ion- and water concentration changes and associated charge-balancing mechanisms. We showcase the suitability of SAXS and SANS to get complementary information on local ion and solvent rearrangement in nanoconfinement, respectively, but also underscore the limitations of simple qualitative models, asking for more quantitative descriptions of water-water and ion-water interactions via detailed atomistic modelling approaches.
OriginalspracheEnglisch
Seiten (von - bis)363-380
Seitenumfang18
FachzeitschriftFaraday Discussions
Jahrgang2024
Ausgabenummer249
DOIs
PublikationsstatusElektronische Veröffentlichung vor Drucklegung. - 16 Aug. 2023

Bibliographische Notiz

Publisher Copyright:
© 2023 The Royal Society of Chemistry.

Funding Information:
The authors would like to acknowledge the allocation of beamtime at the Deutsches Elektronen-Synchrotron (DESY) under proposal I-20220173 EC, as well as at the Institut Laue-Langevin (ILL) under proposals 01-04-228 and 6-07-104. We express our gratitude to both facilities for their support and assistance in conducting the measurements. The authors would also like to express their gratitude to Peter Moharitsch from the Chair of Physics at Montanuniversitaet Leoben for machining and support with the in situ SAXS and SANS cells.

Publisher Copyright:
© 2024 The Royal Society of Chemistry.

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