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In-situ preparation method for photoanode of silicon-tungsten and TiO2 codoped nanotube film

An in-situ preparation and nanotube technology, applied in photovoltaic power generation, photosensitive equipment, capacitor electrodes, etc., can solve problems such as complex processes, and achieve high energy conversion efficiency and good visible light activity

Inactive Publication Date: 2012-06-20
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

You Xiujuan et al. [12] prepared silicon-tungsten co-doped TiO by sol-gel self-propagating combustion method. 2 , TiO can be significantly improved by doping silicotungstic acid 2 photocatalytic efficiency, but the process involved is more complex
While Si-W co-doped TiO 2 Nanotubes have not been reported yet

Method used

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  • In-situ preparation method for photoanode of silicon-tungsten and TiO2 codoped nanotube film
  • In-situ preparation method for photoanode of silicon-tungsten and TiO2 codoped nanotube film
  • In-situ preparation method for photoanode of silicon-tungsten and TiO2 codoped nanotube film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Dilute the Ti sheet with V(deionized water):V(HNO 3 ):V(HF)=5:4:1 solution for pretreatment, and then clean the Ti sheet with deionized water and dry it under air flow. The pretreated Ti sheet was used as the anode, the graphite sheet was used as the cathode, 0.2 M silicotungstic acid was added to the 0.5% HF solution as the electrolyte, the voltage of 20 V was controlled by a DC regulated power supply, anodized for 40 min under magnetic stirring, and finally Repeatedly rinsed with deionized water and dried with air flow to obtain silicon-tungsten co-doped TiO 2 nanotube films (see figure 2 B SEM image). Put the anodized Ti sheet in a porcelain boat, then put it in a muffle furnace, and raise the temperature to 450 o C, the heat treatment time is 2.5 hours. The heat-treated Ti sheets were ultrasonically cleaned with deionized water, and dried under air flow for later use.

[0027] The pretreated Ti sheet was used as the anode, the graphite sheet was u...

Embodiment 2

[0031] Example 2: The pretreatment process of metal titanium sheet is the same as embodiment 1. The pretreated Ti sheet was used as the anode, and the graphite sheet was used as the cathode, and 0.04 M silicotungstic acid was added to the 0.5% HF solution as the electrolyte, and the voltage of 20 V was controlled by a DC stabilized power supply, anodized for 40 min under magnetic stirring, and finally Rinse with deionized water repeatedly, and dry with air flow to obtain TiO 2 nanotube film. The post-processing process and the photoelectric current testing process are the same as in Example 1. Figure 10 showing Si and W co-doped TiO 2 The photocurrent value of the nanotube film electrode under visible light is 0.51 μA / cm 2 .

Embodiment 3

[0032] Example 3: The pretreatment process of metal titanium sheet is the same as embodiment 1. Dilute the Ti sheet with V(deionized water):V(HNO 3 ):V(HF)=5:4:1 solution for pretreatment, and then clean the Ti sheet with deionized water and dry it under air flow. The pretreated Ti sheet was used as the anode, the graphite sheet was used as the cathode, 0.4 M silicotungstic acid was added to the 0.5% HF solution as the electrolyte, and the voltage of 20 V was controlled by a DC stabilized power supply, and anodized for 40 min under magnetic stirring. Rinse with deionized water repeatedly, and dry with air flow to obtain TiO 2 nanotube film. The post-processing process and the photoelectric current testing process are the same as in Example 1. The XPS analysis of the surface composition of the doped sample can confirm the existence of Si element and W element in the sample, the atomic ratio of Si / Ti is 0.10, and the atomic ratio of W / Ti is 0.09. Figure 10 Show Si-W-TiO ...

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Abstract

The invention belongs to the photoelectric and chemical technical field of nano titanium dioxides, in particular to an in-situ preparation method for a silicon-tungsten and TiO2 codoped nanotube film. The invention comprises the following steps: a pretreated metal Ti piece serves as an anode, a graphite piece serves as a cathode, and an HF solution serves as an electrolyte; silicotungstic acid is added in the electrolyte; the anode of a DC stabilized voltage supply is subjected to oxidation; and heat treatment is performed in a pipe furnace, thereby, obtaining the silicon-tungsten and TiO2 codoped nanotube film; the visible light photocurrent of the electrode of the Si-W-TiO2 nanotube thin film electrode is proved to be about 2.6 times of that of the TiO2 nanotube thin film electrode through experiment; and the energy conversion efficiency of a dye sensitized solar cell assembled by the thin film electrode is higher than that of the dye sensitized solar cell made of pure TiO2 nanotube.

Description

technical field [0001] The invention belongs to the technical field of nano-titanium dioxide photoelectrochemistry, and specifically relates to a preparation method of silicon-tungsten co-doped nano-titanium dioxide film with visible light activity. Background technique [0002] Since Professor Gratzel[[i]] in 1991 dye-sensitized TiO 2 Since the nanocrystalline porous film was used as a photoanode to obtain a solar cell with a photoelectric conversion efficiency of 7.1%-7.9%, nano-titanium dioxide has become a promising semiconductor material that has been widely studied. TiO 2 Due to the advantages of non-toxicity, high activity, low cost, and good stability, it has broad application prospects in photocatalytic hydrogen production, photodegradation, and dye-sensitized solar cells. But TiO 2 The bandgap width is large (3.2eV for anatase type, 3.0eV for rutile type), and its poor absorption of visible light greatly limits its application range. In order to improve the uti...

Claims

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Application Information

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IPC IPC(8): H01G9/04H01G9/20H01M14/00H01L51/48
CPCY02E10/542Y02E10/549
Inventor 孙明轩崔晓莉
Owner FUDAN UNIV
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