Preparation method for ultra-long TiO2 nanowire array thin-film photo-anode

A nanowire array and photoanode technology, applied in the field of dye-sensitized solar cells, can solve the problem of high recombination loss of photogenerated carriers, achieve fast electron transfer rate, small recombination loss, and improved performance

Inactive Publication Date: 2015-04-29
HARBIN INST OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the invention is to solve the existing dye-sensitized solar cell TiO 2 The problem of high recombination loss of photog

Method used

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  • Preparation method for ultra-long TiO2 nanowire array thin-film photo-anode
  • Preparation method for ultra-long TiO2 nanowire array thin-film photo-anode
  • Preparation method for ultra-long TiO2 nanowire array thin-film photo-anode

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Example Embodiment

[0036] Specific embodiment 1: This embodiment adopts one-time solvothermal method to directly synthesize one-dimensional rutile TiO on FTO conductive glass 2 The nanowire array includes the following steps:

[0037] Step 1. Process the FTO glass substrate: cut the FTO glass to a size of 2.0×1.5 cm in length and width, and place it in a detergent aqueous solution, acetone and absolute ethanol for ultrasonic cleaning for 10 minutes, and then use deionization in sequence Rinse with water and absolute ethanol and blow dry.

[0038] Step 2, TiCl 4 Solution pretreatment: place the FTO glass with the conductive surface facing up and contain 0.2 M TiCl 4 Treat the solution in a beaker at 70°C for 30 min, take it out, and rinse with deionized water and ethanol and blow dry. among them:

[0039] TiCl used 4 The preparation method of the solution is as follows: add 250 mL deionized water and 41.7 mL concentrated hydrochloric acid into a 500 mL beaker. Under ice bath stirring, slowly add 55 mL...

Example Embodiment

[0046] Specific embodiment two: TiO 2 Controlled growth of nanowire arrays:

[0047] One is to fix the reaction time and the volume of titanium tetrachloride, and by changing the ratio of ethanol to hydrochloric acid, the length, density and regularity of the nanowires can be controlled. In this embodiment, 3 mL of titanium tetrachloride solution is used, the reaction time is fixed at 12 h, and the reaction temperature is 150°C. When the volume of ethanol and hydrochloric acid is 15:45, 20:40, 25:35, 30:30, 35:25 And 40:20 ratio change process, TiO 2 The lengths of the nanowires were 23.3 μm, 39.5 μm, 51.4 μm, 30.3 μm, 17.4 μm, and 17.3 μm, showing a trend of first increasing and then decreasing; with the increase in the proportion of ethanol, the nanowires gradually evolved from cluster growth to Grow independently. When the volume ratio of ethanol: hydrochloric acid is 25:35, the diameter of the nanowires is uniform, the morphology is regular, and the length is the longest. T...

Example Embodiment

[0049] Specific embodiment three: TiO 2 The assembly of dye-sensitized solar cells with nanowire array film as photoanode ( Figure 14 ):

[0050] Process the synthesized nanowire film to obtain TiO with a diameter of 6 mm 2 Nanowire circular film.

[0051] TiCl 4 Solution post-treatment: the configured 1 M TiCl 4 Dilute the hydrochloric acid solution to 40 mM, and stick the edge of the conductive surface of the FTO glass with a certain size of waterproof tape to avoid depositing nanocrystalline TiO 2 , Affecting its conductivity. Then, put the FTO glass into 40 mM TiCl 4 Treat it in an aqueous solution at 70°C for 30 minutes, remove the tape on the FTO glass, rinse with deionized water and ethanol, and blow dry for use.

[0052] TiO 2 Sensitization of nanowire thin film electrodes: before sensitization, under air circulation, use a heat gun to 2 The nanowire thin film electrode is heated to 500℃ for 30 min, and then naturally cooled to 90℃, then the TiO 2 The nanowire film electrode...

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Abstract

The invention relates to a preparation method for an ultra-long TiO2 nanowire array thin-film photo-anode, and belongs to the field of dye-sensitized solar cells. The problem that photon-generated carrier composite losses of an existing dye-sensitized solar cell TiO2 nanocrystalline photo-anode are large is solved. The preparation method comprises the steps that a solvothermal synthesis reaction is carried out at a time, an ethyl alcohol, hydrochloric acid and TiCl4 mixed solution is used as a precursor, and an ultra-long one-dimensional TiO2 nanowire array thin film is made to grow on a piece of FTO conductive glass. The TiO2 nanowire array thin film photo-anode is directly applied on the dye-sensitized solar cell; according to the one-dimensional structure, the electron transport speed is high, the photon-generated carrier composite losses are small, and the performance of the dye-sensitized solar cell is improved.

Description

Technical field [0001] The present invention belongs to the field of dye -sensitized solar cells, involving an ultra -long TIO through a solvent thermal reaction 2 The preparation method of nano -wire array thin anode. Background technique [0002] Energy is an important material basis for the development of national economic development and the improvement of people's living standards.With the continuous improvement of human social productivity, energy consumption is also increasing.At the same time, the energy crisis and environmental deterioration caused by large -scale use of fossil energy have become the primary problems that humans need to solve.In particular, the outbreak of the energy crisis in 1973 prompted countries around the world to accelerate the research and development of renewable energy such as solar, wind energy, water energy, and nuclear energy.As the most renewable energy source for solar energy, it has the unparalleled advantages of other energy sources: ren...

Claims

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Application Information

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IPC IPC(8): H01G9/20H01G9/042B82Y30/00B82Y40/00
CPCY02E10/542
Inventor 于清江李海亮于翠玲黄跃武王金忠国凤云高世勇
Owner HARBIN INST OF TECH
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