Method for preparing nano-branched titanium dioxide photoanode of dye sensitized solar cell

A technology of solar cells and titanium dioxide, which is applied in the field of photoanodes of solar cells, can solve the problems of reducing the surface area of ​​dye adsorption, difficulty in improving efficiency, and large diameter of nano-arrays, so as to improve light absorption efficiency, increase surface area, and increase adsorption area effect

Inactive Publication Date: 2012-01-04
XIAMEN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Hydrothermal method can directly grow dense TiO on the surface of conductive glass 2 Nanowire array, but there is a disadvantage of poor binding force, and the prepared TiO 2 The nanowires are mostly rutile, not the anatase crystal with the best photoelectric performance.
The template method can prepare nanowires with a length of more than ten microns. However, due to two depositions, the diameter of the nanoarray is often relatively large, thereby reducing the surface area for dye adsorption, and the efficiency is difficult to improve.

Method used

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  • Method for preparing nano-branched titanium dioxide photoanode of dye sensitized solar cell
  • Method for preparing nano-branched titanium dioxide photoanode of dye sensitized solar cell
  • Method for preparing nano-branched titanium dioxide photoanode of dye sensitized solar cell

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Experimental program
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Embodiment 1

[0037] 1) Put the FTO conductive glass (1cmx2cm) into acetone, deionized water, and absolute ethanol for ultrasonic cleaning for 30 minutes, and then dry it for use.

[0038] 2) Deposit a layer of ZnO nanorod array template on the FTO by using constant current method. Electrodeposition uses a two-electrode system: FTO is the working electrode, and the Pt electrode is the counter electrode. Electrolyte consists of 5mM Zn(NO 3 ) 2 and 5mM C 6 h 12 N 4 composition. Deposit for 60 minutes under the condition of constant temperature and constant flow, wash with deionized water and set aside for use. Such as figure 1 and 2 As shown, after 60min of electrodeposition, ZnO nanorod arrays with a length of about 1.5μm±25nm and a diameter of about 150±20nm were grown on FTO, from figure 1 and 2 It can be seen that the ZnO nanorods are regular hexagons, and the prepared nanorods are not very vertically ordered due to the unevenness of the FTO surface.

[0039] 3) Place the ZnO n...

Embodiment 2

[0047] Front three steps (step 1), 2), 3)) are identical with embodiment 1.

[0048] 4) Soak the calcined titanium dioxide nanorods in 0.1-0.5M TiCl 4 In the solution for 30-60min, then placed in a 100ml reactor, the FTO conductive glass leans against the inner wall of the reactor. Next, add 50ml of HCl (10%-27% by mass fraction) solution into the reaction kettle, add tetrabutyl titanate with a volume fraction of 1%-6% into the solution, and stir evenly. Finally, the reactor was subjected to a hydrothermal reaction at 150-180° C. for 2 hours. After 2 hours of hydrothermal treatment, the surface morphology of the photoanode is as follows Figure 6 Shown in b: TiO 2 Branched nanowires grow on the surface of the nanorods, by XRD (see Figure 7 The characterization of c) can prove that these branch-like nanowires are TiO in the rutile phase 2 .

[0049] 5) A certain amount of tetrabutyl titanate and HF are mixed, placed in a reaction kettle, and sealed. Put the reaction ket...

Embodiment 3

[0051] Front three steps (step 1), 2), 3)) are identical with embodiment 1.

[0052] 4) Soak the calcined titanium dioxide nanorods in 0.1-0.7M TiCl 4 In the solution for 30-60min, then placed in a 100ml reactor, the FTO conductive glass leans against the inner wall of the reactor. Next, add 50ml of HCl (10%-27% by mass fraction) solution into the reaction kettle, add tetrabutyl titanate with a volume fraction of 1%-6% into the solution, and stir evenly. Finally, the reactor was subjected to a hydrothermal reaction at 150-180° C. for 2.5 hours. After 2.5 hours of hydrothermal treatment, the surface morphology of the photoanode is as follows Figure 6 As shown in c: most of TiO 2 The nanorods have been covered by branched nanowires, and the overall morphology presents a one-dimensional array structure with clusters at the top.

[0053] 5) A certain amount of tetrabutyl titanate and HF are mixed, placed in a reaction kettle, and sealed. Put the reaction kettle into an oven ...

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Abstract

The invention discloses a method for preparing a nano-branched titanium dioxide photoanode of a dye sensitized solar cell and relates to a photoanode of a solar cell. The method comprises the following steps of: cleaning conductive glass; depositing a ZnO nanorod array template on the surface of the conductive glass and dipping in a mixed solution of (NH4)2TiF6 and boric acid to obtain titanium dioxide nanorods; dipping the calcined titanium dioxide nanorods in a TiCl4 solution, putting into a reaction kettle, leaning the conductive glass against the inner wall of the reaction kettle, adding a mixed solution of HCl and tetrabutyl titanate and performing hydrothermal reaction to obtain the nano-branched titanium dioxide photoanode of the dye sensitized solar cell; mixing tetrabutyl titanate and HF, performing hydrothermal reaction, taking out white powder, washing, performing centrifugal separation, drying, putting the product into an absolute ethanol solution to obtain the suspension of titanium dioxide nano-slices; and coating a film layer of titanium dioxide nano-slice granules on the surface of the obtained product to obtain the final product.

Description

technical field [0001] The invention relates to a solar cell photoanode, in particular to a preparation method of a dye-sensitized solar cell nano branch titanium dioxide photoanode. Background technique [0002] 1991, Switzerland and its collaborators [1] For the first time, rhodium complexes were used as sensitizers to develop a new type of dye-sensitized solar cell. This battery uses porous titanium dioxide nanoparticles as a photoanode, and utilizes its adsorption of dyes and conduction of excited electrons for photoelectric conversion. So far, the efficiency of this battery has exceeded 11% [2] . However, despite the high specific surface area of ​​porous titanium dioxide nanoparticles, the disorder of the particle structure makes the electron transfer efficiency low, and the particle interface is easy to recombine photogenerated electrons and holes, so that the battery efficiency is difficult to improve. To solve this problem, in recent years, people have begun t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/04H01G9/20H01M14/00H01L51/48
CPCY02E10/542Y02E10/549
Inventor 林昌健郭文熹郑大江吕妙强
Owner XIAMEN UNIV
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