1-Ethyl-3-propylimidazolium hexafluorophosphate, CAS: 1770850-03-7

Key Applications:

1. Electrochemical Systems

Electrolytes and ionic conductors

• Used in supercapacitors due to its wide electrochemical stability window and low volatility.
• Functions as a co‑solvent or additive in lithium‑ion and sodium‑ion batteries to improve SEI formation, suppress dendrite growth, and enhance ionic conductivity.
• Commonly incorporated into dye‑sensitized solar cells (DSSCs) as part of iodide/triiodide redox electrolyte formulations.

2. Catalysis and Reaction Media

Non‑volatile, tunable solvent for organic synthesis

• Supports transition‑metal catalysis (Pd, Ni, Ru) by improving catalyst dispersion and recyclability.
• Enhances yields in alkylation, acylation, and nucleophilic substitution reactions.
• Enables biphasic catalysis, where the ionic liquid phase simplifies product separation and catalyst recovery.

3. Materials Science and Nanotechnology

Template, stabilizer, or processing medium

• Controls nucleation and growth in nanoparticle synthesis (Au, Ag, Fe₃O₄).
• Incorporated into polymer electrolytes to improve ionic transport and mechanical flexibility.
• Used in membrane fabrication to tune gas permeability and selectivity.

4. Thermal and Tribological Applications

Heat‑transfer and lubrication

• High thermal stability and negligible vapor pressure make it suitable for controlled heat‑transfer systems and thermal‑storage blends.
• Acts as a boundary lubricant with strong anti‑wear performance on steel and aluminum surfaces, forming protective tribofilms under load.

5. Extraction, Separation, and Purification

Hydrophobic ionic liquid for selective extraction

• Applied in metal ion extraction, including rare earth and transition metals, through ion‑exchange or complexation mechanisms.
• Useful in aromatic/aliphatic separations due to π‑interaction with aromatic species.
• Can be blended with functionalized ionic liquids or porous supports for CO₂ capture applications.

6. Analytical Chemistry

Electrode and chromatography applications

• Enhances conductivity and stability of carbon‑based electrodes in electrochemical sensors.
• Serves as a stationary‑phase modifier in gas and liquid chromatography to adjust polarity and retention behavior.

7. Industrial and Process Engineering

Process additives and solvent replacement

• Functions as an antistatic additive in polymer processing.
• Serves as a non‑volatile replacement for traditional organic solvents in closed‑loop systems.
• Used in ionic‑liquid‑based lubricants for high‑temperature or high‑vacuum machinery.

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