Supramolecular ionic liquid gels for quasi-solid-state dye-sensitized solar cells

Area of Science:

• Materials Science
• Electrochemistry
• Supramolecular Chemistry

Background:

• Ionic liquids (ILs) are salts with low melting points, offering unique properties for various applications.
• Supramolecular chemistry enables the design of complex materials through non-covalent interactions.
• Cyclodextrins (CDs) are host molecules capable of forming inclusion complexes with guest molecules.

Purpose of the Study:

• To synthesize a novel supramolecular ionic liquid gel by combining β-cyclodextrin and an ionic liquid.
• To investigate the host-guest interactions and tunable phase transition properties of the gel.
• To evaluate the performance of the synthesized gel as a quasi-solid-state electrolyte in dye-sensitized solar cells (DSSCs).

Main Methods:

• Preparation of a supramolecular ionic liquid gel via host-guest complexation between β-cyclodextrin and 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide.
• Tuning the gel-to-sol phase transition temperature by adjusting the host-to-guest ratio.
• Fabrication and electrochemical testing of quasi-solid-state DSSCs utilizing the synthesized gel electrolyte.

Main Results:

• Successful synthesis of a supramolecular ionic liquid gel based on β-cyclodextrin and an ionic liquid.
• Demonstrated tunability of the gel-to-sol phase transition temperature by varying the host-guest ratio.
• Achieved a power conversion efficiency of 4.79% in DSSCs with excellent long-term stability.

Conclusions:

• The developed supramolecular ionic liquid gel exhibits controllable thermal properties.
• The gel serves as an effective quasi-solid-state electrolyte for dye-sensitized solar cells.
• This work presents a promising approach for stable and efficient solar energy conversion materials.