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Tungsten trioxide nano-film with photocatalytic performance, and preparation method thereof

A technology of tungsten trioxide and nano-thin films, applied in chemical instruments and methods, tungsten oxide/tungsten hydroxide, nanotechnology for materials and surface science, etc., can solve the unfavorable separation of photogenerated electrons and holes, and accept light Insufficient area, insufficient specific surface area, etc., to alleviate the shortage of fossil fuels, increase the specific surface area, and improve the utilization rate

Active Publication Date: 2014-04-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, one-dimensional morphology also has its disadvantages. The specific surface area is not large enough, so that the area receiving light is insufficient; the single growth direction is not conducive to the separation of photogenerated electrons and holes.

Method used

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  • Tungsten trioxide nano-film with photocatalytic performance, and preparation method thereof
  • Tungsten trioxide nano-film with photocatalytic performance, and preparation method thereof
  • Tungsten trioxide nano-film with photocatalytic performance, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) WO 3 Preparation of seed coating

[0043] ① Sonicate the FTO conductive glass in deionized water, acetone and ethanol solution for 10 minutes successively, wash it with deionized water, and dry it for later use;

[0044] ②Preparation of tungstic acid seed layer precursor solution: first mix 1.25g tungstic acid powder, 0.5g polyvinyl alcohol, and 20mL hydrogen peroxide (volume concentration: 30%), and stir at 80°C for 1 hour to obtain 0.25mol / The tungstic acid seed layer precursor solution of L;

[0045] ③Using the method of spin coating, the precursor solution of the tungstic acid seed layer is dynamically coated on the conductive surface of the FTO conductive glass. The conditions of the spin coater are: 500 rpm, spin for 3 minutes;

[0046] ④The FTO conductive glass coated with the precursor solution of tungstic acid seed layer is roasted, using a muffle furnace, the conditions are: heating rate 2°C / min, heating up to 500°C, keeping it for 2 hours, and cooling...

Embodiment 2

[0066] (1) WO 3 The preparation of the seed coating was the same as in Example 1.

[0067] (2) WO 3 Preparation of nanocoating

[0068] ① Prepare the solvothermal precursor solution of tungstic acid: first mix 1g of tungstic acid powder, 10mL of hydrogen peroxide (volume concentration: 30%), and 30mL of deionized water, and stir at 92°C for 1 hour to obtain a preliminary tungstic acid precursor solution. Transfer it into a 100mL volumetric flask, and dilute to volume with deionized water to prepare a 0.04moL / L tungstic acid solution as the final tungstic acid solvothermal precursor solution.

[0069] ② Preparation of crystallization kettle solution: Take 3mL tungstic acid solvothermal precursor solution, mix with 2.5mL deionized water, 0.5mL hydrochloric acid (mass concentration: 37.5%), and 10mL ethylene glycol, and stir for 15 minutes to make it evenly mixed.

[0070] ③ Place the prepared FTO conductive glass with the seed layer facing upwards in the crystallization kett...

Embodiment 3

[0076] (1) WO 3 The preparation of the seed coating was the same as in Example 1.

[0077] (2) WO 3 Preparation of nanocoating

[0078] ① Prepare the solvothermal precursor solution of tungstic acid: first mix 1.5g tungstic acid powder, 10mL hydrogen peroxide (volume concentration: 30%), and 30mL deionized water, and stir at 92°C for 1 hour to obtain a preliminary tungstic acid precursor body solution. Transfer it into a 100mL volumetric flask, and make up to volume with deionized water to prepare a 0.06moL / L tungstic acid solution as the final tungstic acid solvothermal precursor solution.

[0079] ② Preparation of crystallization kettle solution: Take 3mL tungstic acid solvothermal precursor solution, mix with 2.5mL deionized water, 0.5mL hydrochloric acid (mass concentration: 37.5%), and 10mL ethylene glycol, and stir for 15 minutes to make it evenly mixed.

[0080] ③ Place the prepared FTO conductive glass with the seed layer facing upwards in the crystallization kettl...

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Abstract

The invention discloses a tungsten trioxide nano-film with photocatalytic performance, and a preparation method thereof. The tungsten trioxide nano-film is characterized in that a WO3 nano layer with a WO3 nano structure is grown on a WO3 crystal seed layer, and the WO3 nano structure is shaped like a two-dimensional flying saucer including a middle main sheet and a nano-column. The preparation method of the tungsten trioxide nano-film comprises the steps of preparing a tungsten acid crystal seed layer precursor solution, preparing FTO (Fluorine-doped Tin Oxide) conductive glass with the crystal seed layer, preparing thermal tungsten acid solvent precursor solution, and finally performing hydrothermal synthesis to obtain the tungsten trioxide nano-film. According to the tungsten trioxide nano-film with photocatalytic performance, and the preparation method thereof, the specific surface area of the WO3 nano layer can be effectively enlarged; the efficiency of photocatalytic water splitting can be improved, the performance of photocatalytic water splitting in a photoelectric chemical pool is excellent, and excellent chemical stability can be achieved, the preparation method is simple, and the low-cost and large-scale application can be realized.

Description

technical field [0001] The invention relates to the field of semiconductor electrodes used in photoelectrochemical cells, in particular to a tungsten trioxide nano film and a preparation method thereof. Background technique [0002] Excessive use of fossil fuels has caused global temperatures to continue to rise. 1 It is extremely urgent to find a new clean energy source. Among these emerging energy sources, solar energy has attracted much attention as an inexhaustible pollution-free energy source. [0003] Since 1972, Fujishima and Honda reported that TiO 2 After splitting water to produce hydrogen, the scientific community has aroused great interest in photocatalytic methods. Photoelectrocatalytic (PEC) water splitting hydrogen production technology is based on two renewable substances, solar energy and water, without by-products, and will not pollute the environment. At the same time, PEC technology takes into account both small-scale applications and large-scale devel...

Claims

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Application Information

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IPC IPC(8): C01G41/02B82Y30/00C03C17/23B01J23/20C01B3/04
CPCY02E60/36
Inventor 巩金龙张冀杰王拓张鹏李长江常晓侠
Owner TIANJIN UNIV
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