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Stable, High-Efficiency Pyrrolidinium-Based Electrolyte for Solid-State Dye-Sensitized Solar Cells.

Tong He1, Ye Feng Wang1, Jing Hui Zeng1

  • 1School of Chemistry & Chemical Engineering, ‡School of Material Science and Engineering, and §Shaanxi Provincial Key Laboratory of Macromolecular Science, Shaanxi Normal University , Xi'an 710620, P. R. China.

ACS Applied Materials & Interfaces
|September 4, 2015
PubMed
Summary

We developed novel pyrrolidinium dicationic ionic crystals for dye-sensitized solar cells (DSSCs). These solid electrolytes offer high conductivity and excellent long-term stability, achieving 6.02% efficiency.

Keywords:
DSSCdicationicelectrolyteorganic ionic-conductorthree-dimensional channel

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Dye-sensitized solar cells (DSSCs) require stable and efficient electrolytes.
  • Developing solid-state electrolytes is crucial for improving DSSC performance and longevity.
  • Ionic crystals offer potential as solid matrices for electrolytes due to their ordered structures.

Purpose of the Study:

  • To synthesize and characterize pyrrolidinium-based dicationic ionic crystals.
  • To investigate the structure-property relationships of these ionic crystals as solid electrolytes in DSSCs.
  • To evaluate the impact of crystal structure on device performance and stability.

Main Methods:

  • Synthesis of pyrrolidinium-based dicationic ionic crystals.
  • Crystal structure analysis to identify ionic channels.
  • Fabrication and testing of DSSCs using the synthesized ionic crystals as solid electrolytes.
  • Electrochemical characterization including steady-state voltammetry, current-voltage traces, and electrochemical impedance spectroscopy.

Main Results:

  • Synthesized dicationic ionic crystals exhibit high melting points and thermal stability.
  • Ordered 3D ionic channels were observed, promoting ionic conductivity.
  • An optimized ionic crystal, [C6BEP][TFSI]2, yielded a DSSC efficiency of 6.02%.
  • The DSSC device demonstrated excellent long-term stability, retaining 92% of initial efficiency after 960 hours.

Conclusions:

  • Pyrrolidinium-based dicationic ionic crystals are promising solid-state electrolytes for DSSCs.
  • Crystal structure, including alkylene chain length and anion type, significantly influences electrolyte performance.
  • These findings provide insights for designing advanced solid electrolytes to enhance DSSC efficiency and stability.