Abstract
Experimental Studies of the Capacitive Potential Region at Ionic-Liquid:Electrode Interfaces
Meeting abstracts (Electrochemical Society), Vol.MA2025-02(55), pp.2656-2656
11/24/2025
DOI: 10.1149/MA2025-02552656mtgabs
Abstract
Ionic liquids behave differently than 'normal' solvents in both the bulk and interfacial domains. Their intermolecular interactions drive intriguing phase behaviours and unexpected molecular architectures. This presentation shares experimental data that examines capacitive responses of several ionic liquids near solid electrode surfaces. We measure these responses with an array of methods including single frequency AC voltammetry to Fourier-transformed large amplitude alternating current voltammetry. We show examples of significant and reproducible capacitive hysteresis, and suggest possible explanations based on the unique behaviors of ionic liquids reported previously. Specifically, EMIM TFO on a polycrystalline gold electrode shows hysteresis of a camel-shaped feature, supposedly near the point of zero charge, of approximately two volts depending on the applied potential scan direction (cathodic vs. anodic). Significant deviations with respect to scan direction persist even when the IL is diluted to >50% in MeCN, suggesting electrode-surface segregation of IL ions. Ultimately, this series of experiments shows the need for considering additional experimental parameter spaces when making measurements in, or with, ionic liquid electrolytes.
Image caption: capacitance curves for BMIM BF4 on Au at 9.02 Hz with Δ E amp = 80 mV. Anodic (black line) and cathodic (red line) scan directions.
Figure 1
Details
- Title: Subtitle
- Experimental Studies of the Capacitive Potential Region at Ionic-Liquid:Electrode Interfaces
- Creators
- Scott K Shaw
- Resource Type
- Abstract
- Publication Details
- Meeting abstracts (Electrochemical Society), Vol.MA2025-02(55), pp.2656-2656
- DOI
- 10.1149/MA2025-02552656mtgabs
- ISSN
- 2151-2043
- eISSN
- 2151-2035
- Language
- English
- Date published
- 11/24/2025
- Academic Unit
- Chemistry
- Record Identifier
- 9985035039702771
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