Haeckl, Katharina and Li, Hua and Aldous, Iain M. and Tsui, Terrence and Kunz, Werner and Abbott, Andrew P. and Warr, Gregory G. and Atkin, Rob (2019) Potential Dependence of Surfactant Adsorption at the Graphite Electrode/Deep Eutectic Solvent Interface. JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 10 (18). pp. 5331-5337. ISSN 1948-7185,
Full text not available from this repository. (Request a copy)Abstract
Atomic force microscopy and cyclic voltammetry are used to probe how ionic surfactant adsorbed layer structure affects redox processes at deep eutectic solvent (DES)/graphite interfaces. Unlike its behavior in water, sodium dodecyl sulfate (SDS) in DESs only adsorbs as a complete layer of hemicylindrical hemimicelles far above its critical micelle concentration (CMC). Near the CMC it forms a tail-to-tail monolayer at open-circuit potential (OCP) and positive potentials, and it desorbs at negative potentials. In contrast, cetyltrimethylammonium bromide (CTAB) adsorbs as hemimicelles at low concentrations and remains adsorbed at both positive and negative potentials. The SDS horizontal monolayer has little overall effect on redox processes at the graphite interface, but hemimicelles form an effective and stable barrier. The stronger solvophobic interactions between the C-16 versus C-12 alkyl chains in the DES allow CTAB to self-assemble into a robust coating at low concentrations and illustrate how the structure of the DES/electrode interface and electrochemical response can be engineered by controlling surfactant structure.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SHAPE-CONTROLLED SYNTHESIS; ALKYL CHAIN-LENGTH; IONIC LIQUIDS; DOUBLE-LAYER; FORCE MICROSCOPY; ELECTRODEPOSITION; NANOSTRUCTURE; MIXTURES; NICKEL; MICA; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Mar 2020 11:59 |
| Last Modified: | 27 Mar 2020 11:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26235 |
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