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Flexible Aqueous Supercapacitors for Long Cycle-Life Using Electrode with Multiple Active C═S Sites.
Xinxin Xing1, Bita Farhadi2,3, Le Wang2,3
1College of Physical Science and Technology, Dalian University, Dalian, Liaoning, 116622, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|June 11, 2024
Summary
Trithiocyanuric acid (TCA) prevents dissolution in aqueous electrolytes, significantly enhancing supercapacitor cycle life. This material also improves energy density and facilitates efficient solar energy storage when integrated with perovskite solar cells.
Area of Science:
- Materials Science
- Electrochemistry
- Renewable Energy
Background:
- Organic materials for energy storage face challenges with electrolyte dissolution, limiting long-term performance.
- Developing stable and efficient electrode materials is crucial for advanced energy storage devices.
Purpose of the Study:
- To investigate trithiocyanuric acid (TCA) as a stable organic material for aqueous electrolytes in supercapacitors.
- To enhance the cycle life and energy density of supercapacitors using TCA.
- To explore the integration of TCA-based supercapacitors with perovskite solar cells for efficient solar energy utilization.
Main Methods:
- Utilized the principle of 'like dissolves like' to select non-polar TCA for aqueous electrolytes.
- Performed theoretical calculations to understand TCA's electronic properties and reaction kinetics.
- Fabricated and tested asymmetric flexible supercapacitors using TCA electrodes.
- Integrated supercapacitors with perovskite solar cells for solar energy storage evaluation.
Main Results:
- TCA effectively inhibited dissolution in aqueous electrolytes, prolonging cycle life.
- Theoretical calculations indicated TCA lowers the LUMO energy level, promoting reaction kinetics.
- Supercapacitors showed excellent capacitance retention (93.1% after 50,000 cycles) and high energy density.
- Asymmetric flexible supercapacitors maintained 94.2% capacitance after 80,000 cycles.
- Integrated devices demonstrated efficient storage of photogenerated charges from perovskite solar cells.
Conclusions:
- Trithiocyanuric acid is a promising, stable organic material for high-performance supercapacitors.
- TCA-based supercapacitors offer a practical solution for long-term energy storage and renewable energy integration.
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