Efficient platinum-free counter electrodes for dye-sensitized solar cell applications

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• Dye-sensitized solar cells (DSSCs) are a promising photovoltaic technology.
• Developing efficient and cost-effective counter electrodes is crucial for DSSC performance.
• Platinum is commonly used as a catalyst but is expensive and scarce.

Purpose of the Study:

• To fabricate nanoporous poly(3,4-propylenedioxythiophene) (PProDOT) layers for DSSCs.
• To investigate the effect of hydrophobic ionic liquids on PProDOT microstructure and electrochemical properties.
• To develop platinum-free counter electrodes for stable, flexible, and cost-effective DSSCs.

Main Methods:

• Electrical-field-assisted growth of PProDOT layers using different hydrophobic ionic liquids.
• Fabrication of DSSCs incorporating the synthesized PProDOT counter electrodes.
• Characterization of PProDOT microstructure, electrochemical properties, and device performance (current-voltage characteristics, power conversion efficiency).

Main Results:

• PProDOT layers were successfully synthesized with controlled microstructures.
• The choice of ionic liquid significantly influenced the electrochemical properties of the PProDOT counter electrodes.
• DSSCs fabricated with PProDOT synthesized using highly hydrophobic ionic liquids achieved power conversion efficiencies exceeding 9%.
• These devices demonstrated high catalytic activity, stability, and flexibility, functioning effectively under varying sunlight intensities.

Conclusions:

• Hydrophobic ionic liquids are effective in fabricating highly catalytic PProDOT counter electrodes for DSSCs.
• The developed PProDOT-based counter electrodes offer a viable, platinum-free alternative for high-performance, cost-effective, and flexible DSSCs.
• This approach contributes to the advancement of sustainable and efficient solar energy conversion technologies.