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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
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Surfactant effects on electrochemically durable lead halide perovskite electro-catalysts
Ren-Jun Zhong1, Kai-Wei Tsao1, Chun-Hao Cheng2
1Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan. ctli@gapps.ntnu.edu.tw.
Dalton Transactions (Cambridge, England : 2003)
|April 11, 2023
Summary
Novel perovskite electrodes passivated with tetra-n-hexyl ammonium halides enhance dye-sensitized solar cell performance. These durable electrodes offer improved electro-catalytic activity and stability in ambient conditions.
Area of Science:
- Materials Science
- Electrochemistry
- Renewable Energy
Background:
- Dye-sensitized solar cells (DSSCs) require efficient counter electrodes for optimal performance.
- Perovskite materials offer promising electro-catalytic properties but often suffer from stability issues.
Purpose of the Study:
- To develop electrochemically durable perovskite counter electrodes for DSSCs.
- To investigate the effect of surfactant passivation on perovskite electrode stability and electro-catalytic activity.
Main Methods:
- Fabrication of nickel foam/TiO2/FA(Pb1-xGex)I3 perovskite electrodes.
- Passivation using tetra-n-alkyl ammonium halides with varying alkyl chain lengths and halide compositions.
- Electrochemical characterization and DSSC performance testing.
- Stability tests under ambient conditions with high relative humidity.
Main Results:
- Surfactant passivation with tetra-n-hexyl ammonium iodide/bromide (THAI0.5Br0.5) significantly improved perovskite stability and electro-catalytic activity.
- The optimal electrode demonstrated enhanced performance (8.87%) compared to platinum (8.74%) in DSSCs.
- The modified electrodes showed high efficiencies under various indoor lighting conditions (21.5%–22.9%).
Conclusions:
- Tetra-n-alkyl ammonium halide passivation is effective in enhancing the stability and performance of perovskite counter electrodes.
- The optimized perovskite electrodes exhibit excellent electro-catalytic properties and stability, making them suitable for DSSCs and other electrochemical devices.
- Air-stable perovskites show significant potential for high-performance electrochemical applications.
