Silver nanoparticle modified SiO2@TiO2 layered microsphere, preparation method and application thereof
A technology of silver nanoparticles and microspheres, which is applied in the field of solar cells, can solve the problems of low solar energy density, high cost, and low efficiency, and achieve the effects of increasing light absorption, improving separation of photogenerated charges, and improving light absorption
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Embodiment 1
[0020] Example 1: Silver Nanoparticles-Modified SiO 2 @TiO 2 Layered microspheres (SiO 2 @TiO 2 -Ag) preparation and characterization
[0021] 1. Weigh 0.12g of silica powder with a particle size of 400nm and add it to a mixed solution of 30mL of acetonitrile and 90mL of absolute ethanol. After ultrasonic dispersion, place it in a water bath at 21°C, add 1mL of ammonia water to stir, and then slowly add 1mL to the system. Isopropyl titanate, reacted for 12h, centrifuged and dried after the reaction to obtain SiO 2 @TiO 2 ;
[0022] 2. The SiO 2 @TiO 2 was added to 30 mL of anhydrous ethanol, and then 1 mL of silane coupling agent (3-aminopropyltriethoxysilane) was added to react at 80 °C for 4 hours. After the reaction was completed, centrifugation and drying were performed. 2 @TiO 2 The microspheres were dispersed in 30 mL of deionized water, 8 mg of silver nitrate solid was added to dissolve, then the temperature was raised to 90 °C, and then 0.04 g of sodium citrat...
Embodiment 2
[0025] Example 2: Silver Nanoparticles-Modified SiO 2 @TiO 2 Layered microspheres (SiO 2 @TiO 2 -Ag) preparation in photoanode
[0026] The FTO glass was cleaned with acetone, ethanol, and deionized water under the action of ultrasonic waves, respectively, and dried (2.2 mm, 14Ω / sq). First will contain 0.5mL of acetylacetone and 0.1g of SiO 2 @TiO 2 -A typical slurry of Ag layered microsphere powder was dispersed and stirred for 30 minutes, and the resulting slurry was spread on a 0.25 cm area by blade coating 2 A uniform thin film was formed on the clean FTO plate, and the photoanodic thin film was obtained after drying and annealing at 450 °C for about 30 min.
[0027] Figure 4 Silver nanoparticle-decorated SiO is shown 2 @TiO 2 Layered microspheres (SiO 2 @TiO 2 -Ag) UV-Vis spectral light absorption results. Intermediate product microspheres (SiO 2 @TiO 2 ) can increase absorption in the visible region more than titanium dioxide by scattering, while SiO 2 @T...
Embodiment 3
[0028] Example 3: Silver Nanoparticles-Modified SiO 2 @TiO 2 Layered microspheres (SiO 2 @TiO 2 -Ag) photoanode dye-sensitized cell assembly test
[0029] A typical slurry containing 0.5 mL of acetylacetone and 0.1 g of titanium dioxide powder was first dispersed and stirred for 30 minutes. The mass percentages of 1wt%, 2wt% and 3wt% of SiO were prepared respectively 2 @TiO 2 -Ag microsphere slurry replaces titanium dioxide to obtain three kinds of composite slurries with different contents, and then the obtained slurries are coated on a 0.25cm area by blade coating method 2 A uniform thin film was formed on a clean FTO plate; after drying and annealing at 450 °C for about 30 min, these photoanodes were labeled as 1% microspheres, 2% microspheres, and 3% microspheres, respectively. 36 mg of N719 dye was dissolved in 100 mL of ethanol and stirred in the dark for 24 h. The annealed photoanode was placed in N719 solution and immersed in the dark for 24 h. After the end, t...
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