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A photoanodic modification method to improve the stability of dye-sensitized solar cells
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A technology of solar cells and dye sensitization, which is applied in the field of solar cells, can solve problems such as damaging photoelectric performance, and achieve the effects of improving stability, prolonging service life, and low cost
Active Publication Date: 2018-01-16
SHANGQIU NORMAL UNIVERSITY
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However, this type of method involves a complex dye synthesis process, and changing the chemical structure of the dye molecule may damage its photoelectric properties, such as photoelectron injection efficiency, light absorption capacity, etc.
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Embodiment 1
[0025] Example 1: Preparation of one-dimensional structure titanium dioxide nanowires by hydrothermal preparation
[0026] A 10 mm × 20 mm fluorine-doped tin oxide conductive glass (FTO) substrate was ultrasonically washed with acetone, 2-isopropanol, ethanol, and secondary water for 15 min, respectively. The cleaned FTO conductive glass slide was placed sideways in a 25 mL reaction kettle, and the precursor solution (10 mL toluene, 1 mL concentrated hydrochloric acid, 1 mL n-butyl titanate) was added. at 180 o C conditions for 10 h. After the reactor was naturally cooled, the FTO substrate was taken out, rinsed with ethanol and placed in a muffle furnace at 450 o Calcined at C for 0.5h to obtain the titania nanowire array structure ( figure 1 ), with a diameter of 40 nm and a length of 4 μm.
Embodiment 2
[0027] Example 2: Silanization treatment on the surface of titanium dioxide nanowire arrays
[0028] The titanium dioxide nanowire array synthesized above was soaked in the ethanol solution containing the ruthenium bipyridine complex dye for 24 h to allow the dye molecules to be adsorbed. The silanization treatment was carried out in a closed container equipped with a gas inlet and outlet valve. The titanium oxide nanowire array after adsorbing the dye was placed in the reactor, and nitrogen gas was introduced for 30 min to control the relative humidity at 12%. Chloromethylsilane. The reaction time was controlled at 0, 5, 10, 20, 30, 40, and 50 min, respectively. After silanization, rinse the titanium dioxide surface with pyridine (5%) in acetonitrile, 150 o C for 10 min to obtain a silanized photoanode.
[0029] The photoanodes after silanization treatment at different times were assembled into cells for photovoltaic performance testing. The counter electrode of the batte...
Embodiment 3
[0032] Example 3: Testing of the stability of silanized photoanodes
[0033] The modified photoanode obtained above was placed in the air for 0, 5, 10, 15, 20, 25, and 30 days, respectively, and then the operability was measured. See Example 2 for the test method. And the titanium dioxide nanowire array electrode with dye molecules without silanization treatment was compared, and the results were as follows Figure 4 shown. Through comparison, it is confirmed that the modified photoanode obtained in the present invention can still maintain its original photoelectric performance after 30 days, and has good stability.
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Abstract
The invention belongs to the field of solar cells and discloses a photoanode modification method for improving the stability of dye-sensitized solar cells. In this method, the one-dimensional titanium dioxide nanowire array synthesized by the hydrothermal method is used as the dye loading material, and the surface of the titanium dioxide is treated with silanization after the dye is adsorbed, and a uniform silanization protective layer is formed on the titanium dioxide nanowires, which prevents the dye molecules from the interface. The desorption on the surface greatly improves the stability of the titanium dioxide photoanode. The method has the advantages of simple operation and strong compatibility. The photoelectric test shows that the photoanode treated by this method can still maintain its original photoelectric performance after being stored in the air for a long time. The method can be widely applied to the surface modification of the dye-sensitized solar anode to improve its stability and prolong the service life of the battery.
Description
technical field [0001] The invention belongs to the field of solar cells, and in particular relates to a method for modifying the photoanode of a dye-sensitized solar cell. Background technique [0002] Due to the increasing depletion of traditional conventional energy and the aggravation of environmental problems, it is urgent to develop clean and renewable energy to meet the increasing energy demand of human beings. Photovoltaic cells are an important form of renewable energy. However, the current photovoltaic power generation mainly uses silicon-based battery packs, but this type of battery has strict requirements on materials, resulting in high production costs. Dye-sensitized solar cells (DSSCs) are a new type of solar cells, which have many advantages such as low cost, easy fabrication, and strong structure controllability, and are considered to have great potential to replace conventional photovoltaic cells. [0003] In addition to efficiency factors, stability is ...
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