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A kind of bismuth tungstate nano film with photocatalytic performance and its preparation method and use

A nano-film and bismuth tungstate technology, which is applied in chemical instruments and methods, nanotechnology, physical/chemical process catalysts, etc., can solve the problems of long exchange time, unfavorable electron conduction, high ion exchange temperature, etc., and achieve short reaction time, The effect of strong controllability and simple operation process

Active Publication Date: 2017-12-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But with WO 3 For the ion exchange method of the precursor, the ion exchange temperature is higher, the exchange time is longer, and at the same time Bi 2 WO 6 There is a layer of WO between the film and the base tungsten plate 3 , is not conducive to the conduction of electrons

Method used

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  • A kind of bismuth tungstate nano film with photocatalytic performance and its preparation method and use
  • A kind of bismuth tungstate nano film with photocatalytic performance and its preparation method and use
  • A kind of bismuth tungstate nano film with photocatalytic performance and its preparation method and use

Examples

Experimental program
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Effect test

Embodiment 1-9

[0024] Embodiment 1-9 is Bi of different specifications described in the present invention 2 WO 6 Preparation method of nano film

Embodiment 1

[0026] (1) Preparation of Bismuth Oxyiodide Nanosheet Precursor Solution

[0027] a) Sonicate the FTO conductive glass successively in deionized water, acetone and ethanol solution for 10 minutes, wash it with deionized water, and dry it for later use;

[0028] b) Add 3.32g of potassium iodide powder and 0.9702g of bismuth nitrate powder into 60mL of deionized water, and adjust the pH to 1.7 with commercial concentrated nitric acid with a volume fraction of 65-68%, and finally obtain a concentration of 0.04moL / L's bismuth oxyiodide nanosheet precursor solution.

[0029] (2) Preparation of bismuth oxyiodide nanosheet thin film

[0030] The cathodic electrodeposition step was performed using a standard three-electrode setup. The FTO conductive glass was used as the working electrode, the platinum sheet electrode was used as the counter electrode, and the silver / silver chloride electrode was used as the reference electrode. The precursor solution of bismuth oxyiodide nanosheets...

Embodiment 2

[0036] (1) Preparation of Bismuth Oxyiodide Nanosheet Precursor Solution

[0037] a) Sonicate the FTO conductive glass successively in deionized water, acetone and ethanol solution for 10 minutes, wash it with deionized water, and dry it for later use;

[0038] b) Add 1.66g of potassium iodide powder and 0.4851g of bismuth nitrate powder into 60mL of deionized water, and adjust the pH to 1.7 with commercial concentrated nitric acid with a volume fraction of 65-68%, and finally obtain a concentration of 0.02moL / L's bismuth oxyiodide nanosheet precursor solution.

[0039] (2) The preparation of bismuth oxyiodide nanosheet thin film is the same as that in Example 1.

[0040] (3) Bi 2 WO 6 The preparation of nano film is the same as that in Example 1.

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Abstract

The invention discloses a bismuth tungstate nano-film with photocatalytic performance as well as a preparation method and application thereof. The bismuth tungstate nano-film comprises an underlayer and a bismuth tungstate nanolayer grown on the underlayer and consisting of a bismuth tungstate nano-structure, wherein the underlayer is fluorine-doped tin oxide conductive glass. The preparation method comprises the following steps: adopting potassium iodide and bismuth nitrate as raw materials, fluorine-doped tin oxide conductive glass as a working electrode, a platinum plate electrode as a counter electrode, and a silver / silver chloride electrode as a reference electrode, and performing ion exchange, calcining and other steps to obtain the bismuth tungstate nano-film. The bismuth tungstate nano-film can be used for photocatalytic water-splitting hydrogen production in a photoelectrochemical tank, has the nanotopography of a one-dimensional nanosheet with a large specific surface area and also has the visible-light photocatalytic water-splitting hydrogen production activity. The preparation method is simple in operation process, mild in reaction condition, short in reaction time and strong in operation controllability.

Description

technical field [0001] The invention relates to the field of semiconductor electrodes used in photoelectrochemical cells, in particular to a bismuth tungstate nano film and its preparation method and application. Background technique [0002] Excessive use of fossil fuels has caused global temperatures to continue to rise (Messinger, J., Catalysts for Solar Water Splitting. Chem Sus Chem 2009, 2(1), 47-48), and it is urgent to find new clean energy sources. Among the existing emerging energy sources, solar energy has attracted much attention as an inexhaustible and pollution-free energy source. Since 1972, Fujishima and Honda reported TiO 2 Since the splitting of water to produce hydrogen, the scientific community has generated great interest in photoelectrocatalytic methods. Photocatalytic 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,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/06B01J23/31B82Y40/00
CPCB82Y40/00C25B1/02C25D9/08C25B1/55C25B11/077Y02E60/36
Inventor 巩金龙张冀杰王拓张鹏常晓侠
Owner TIANJIN UNIV