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Void-Assisted Ion-Paired Proton Transfer at Water-Ionic Liquid Interfaces.
Eva Alvarez de Eulate1, Debbie S Silvester1, Damien W M Arrigan2
1Nanochemistry Research Institute, Department of Chemistry, Curtin University, GPO Box U1987, Perth, Western Australia 6845 (Australia).
Angewandte Chemie (International Ed. in English)
|October 23, 2015
Summary
Protons and deuterium ions exhibit unique electrochemical transfer at an ionic liquid interface, unlike alkali metal cations. This discovery, driven by the [FAP](-) anion, impacts fuel cells and hydrogen storage technologies.
Area of Science:
- Electrochemistry
- Materials Science
- Ionic Liquids
Background:
- Ionic liquids are increasingly used as aprotic solvents in electrochemical applications.
- Understanding ion transfer mechanisms at electrode-electrolyte interfaces is crucial for optimizing device performance.
- The specific behavior of protons and deuterium ions in ionic liquids remains an area of active research.
Purpose of the Study:
- To investigate the electrochemical transfer behavior of protons (H+) and deuterium ions (D+) at the water-trihexyl(tetradecyl)phosphonium tris(pentafluoroethyl)trifluorophosphate ([P14,6,6,6][FAP]) ionic liquid interface.
- To compare the transfer behavior of H+/D+ with that of alkali metal cations (Li+, Na+, K+).
- To elucidate the role of the ionic liquid's counter anion ([FAP](-)) in facilitating ion transfer.
Main Methods:
- Electrochemical experiments were conducted at the interface of an ionic liquid ([P14,6,6,6][FAP]) and water.
- The transfer of various cations (H+, D+, Li+, Na+, K+) across the interface was studied.
- Analysis focused on identifying the mechanisms and conditions promoting or inhibiting ion transfer.
Main Results:
- Protons (H+) and deuterium ions (D+) demonstrated unusual electrochemical transfer behavior at the [P14,6,6,6][FAP] ionic liquid interface.
- Alkali metal cations (Li+, Na+, K+) did not exhibit similar transfer.
- The hydrophobic [FAP](-) anion was found to assist H+/D+ transfer, leading to the formation of a mixed capacitive layer by filling voids in the ionic liquid structure.
Conclusions:
- The findings reveal a novel mechanism for proton and deuterium ion transfer at ionic liquid interfaces.
- This phenomenon, mediated by the [FAP](-) anion, has significant implications for electrochemical systems utilizing ionic liquids.
- Potential applications include advancements in proton-coupled electron transfers, fuel cells, and hydrogen storage.
Keywords:
capacitanceliquid-liquid interfacesproton transferroom temperature ionic liquidsvoltammetryMore Related Videos
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