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Effect of Water on Local Structure and Dynamics in a Protic Ionic Liquid-Based Electrolyte
Filippa Lundin1, Timo Stettner2,3, Peter Falus4
1Department of Physics, Chalmers University of Technology, 412 96, Göteborg, Sweden.
Chemsuschem
|April 8, 2025
Summary
Adding water to ionic liquids (ILs) creates hybrid electrolytes for supercapacitors. This improves ion transport by separating ion pairs, enhancing conductivity for energy storage applications.
Area of Science:
- Electrochemistry
- Materials Science
- Physical Chemistry
Background:
- Ionic liquids (ILs) are explored as electrolytes for advanced energy systems.
- High IL viscosity limits ion transport, necessitating dilution strategies.
- Protic IL/water hybrid electrolytes are investigated for supercapacitor applications.
Purpose of the Study:
- To investigate the structural and dynamic effects of water addition to a protic ionic liquid.
- To validate molecular dynamics simulation predictions for protic IL/water systems.
- To correlate microscopic changes with macroscopic ionic conductivity.
Main Methods:
- Small-angle X-ray scattering (SAXS) for structural analysis.
- Infrared (IR) spectroscopy to study molecular interactions.
- Neutron spin-echo (NSE) spectroscopy for probing local dynamics.
Main Results:
- Water molecules integrate into the ionic liquid matrix as single molecules and aggregates.
- Hydrogen bonding between water and IL cations separates ion pairs, increasing charge correlation distance.
- A local diffusive process observed via NSE correlates with enhanced ionic conductivity.
Conclusions:
- Water addition effectively modifies the structure and dynamics of protic ionic liquids.
- Hybrid electrolytes show promise for improved supercapacitor performance.
- Observed structural changes and dynamics are transient, with short lifetimes.
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