研究目的
Investigating the improvement of power conversion efficiency (PCE) in dye-sensitized solar cells (DSSCs) through the use of a TiO2 compact layer prepared via heat treatment assisted electrospinning.
研究成果
The incorporation of a TiO2 compact layer prepared via heat treatment assisted electrospinning significantly improves the PCE of DSSCs by reducing recombination effects and enhancing electron lifetime and charge collection efficiency. This method presents a promising approach for the development of more efficient DSSCs.
研究不足
The study focuses on the improvement of PCE through the use of a TiO2 compact layer but does not explore the long-term stability or scalability of the method for industrial applications.
1：Experimental Design and Method Selection:
The study involved the preparation of a TiO2 compact layer using heat treatment assisted electrospinning. Titanium tetraisopropoxide mixed with polyvinyl-alcohol was used as the electrospun solution. The compact layer was then applied to TiO2 photoanodes for DSSCs.
2：Sample Selection and Data Sources:
Indium tin oxide (ITO) glasses were used as substrates. The performance of DSSCs with and without the TiO2 compact layer was compared.
3：List of Experimental Equipment and Materials:
Materials included ITO glasses, nanocrystalline cellulose, 3,4-ethylenedioxythiophene, titanium tetraisopropoxide, polyvinyl-alcohol, TiO2 (Degussa P25), and others. Equipment included a potentiostat, FTIR spectrometer, FESEM, XRD diffractometer, and UV-Vis spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The electrospun solution was prepared and applied to ITO substrates. The compact layer was formed by heat treatment. Photoanodes were constructed with and without the compact layer, and DSSCs were assembled and characterized.
5：Data Analysis Methods:
The performance of DSSCs was analyzed using electrochemical impedance spectroscopy, cyclic voltammetry, UV-Vis absorption, and current-voltage measurements.
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Field emission scanning electron microscopy (FESEM)
JEOL JSM-7600F
JEOL
Used to investigate the morphological structure of the photoanodes.
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Potentiostat
Autolab PGSTAT204
Autolab
Used for electrochemical measurements including cyclic voltammetry and electrochemical impedance spectroscopy.
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Ultraviolet-visible (UV-Vis) spectrophotometer
Autolab Spectrophotometer UA
Autolab
Used for UV-Vis absorption analysis of the dye molecules.
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Polyvinyl-alcohol (PVA)
Mw 89,000-98,000
Sigma-Aldrich
Used in the electrospun solution to prepare the TiO2 compact layer.
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Indium tin oxide (ITO) glasses
7 Ω/sq
Xinyan Technology Ltd
Used as substrates for the photoanodes in DSSCs.
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Titanium tetraisopropoxide (TTIP)
Sigma-Aldrich
Used as a precursor for the electrospun solution to prepare the TiO2 compact layer.
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TiO2 (Degussa P25)
Sigma-Aldrich
Used to prepare the TiO2 paste for the photoanodes.
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Ruthenizer 535-bis TBA (N719)
Solaronix SA
Used as a dye sensitizer in the DSSCs.
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Iodolyte Z-100
Solaronix SA
Used as the electrolyte in the DSSCs.
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Fourier transform infrared (FTIR) spectrometer
Perkin-Elmer
Used to obtain FTIR spectra of the photoanodes.
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X-ray diffraction (XRD) diffractometer
Shimadzu
Used to record XRD patterns of the photoanodes.
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