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Preparation method for WO3-LDH composite film for photoelectrocatalytic water decomposition

A composite thin film, photoelectric catalysis technology, applied in the direction of electrolysis process, electrolysis components, cells, etc., can solve the problem that it cannot be used as a photocatalytic material, and achieve the effect of high separation efficiency, improved catalytic ability, and low oxygen evolution potential

Active Publication Date: 2016-12-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, titanium dioxide has a wide band gap (3-3.2 eV), and less than 5% of the solar energy reaching the earth's surface can be utilized (ultraviolet light, λ<400 nm), making it unsuitable as an ideal photocatalytic material
Currently, using WO 3 Combined with layered double hydroxide LDH to form WO 3 -The technology of LDH composite film has not been reported yet

Method used

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  • Preparation method for WO3-LDH composite film for photoelectrocatalytic water decomposition
  • Preparation method for WO3-LDH composite film for photoelectrocatalytic water decomposition
  • Preparation method for WO3-LDH composite film for photoelectrocatalytic water decomposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 0.5 g of ammonium tungstate and dissolve it in 30 ml of water, adjust the pH of the solution to 1 with 6 mol / L HCl solution, stir at 40°C until a colorless and transparent solution is formed, then transfer the solution to a 50 ml high pressure In the polytetrafluoroethylene lining of the reactor;

[0034] (2) Insert the pretreated FTO conductive glass sheet obliquely into the inner lining of the reactor so that the conductive side faces down;

[0035] (3) Seal the reactor tightly and place it in an oven for solvothermal reaction, heat it at 180 °C for 5 h, cool it down to room temperature naturally, wash the conductive glass with deionized water and absolute ethanol, and dry it at 40 °C to obtain light cyan film;

[0036] (4) Under the protection of air atmosphere, the conductive glass with thin film was heat-treated at 500 °C for 2 h to obtain yellow WO 3 film.

[0037] (5) A three-electrode system is adopted, as follows: long with WO 3 The FTO conductive...

Embodiment 2

[0042] (1) Weigh 0.5 g of ammonium tungstate and dissolve it in 30 ml of water, adjust the pH of the solution to 1 with 6 mol / L HCl, stir at 40°C until a colorless and transparent solution is formed, then transfer to a 50 ml autoclave In the PTFE lining;

[0043] (2) Insert the pretreated FTO conductive glass sheet obliquely into the inner lining of the reactor so that the conductive side faces down;

[0044] (3) Seal the reactor tightly and put it in an oven for solvothermal reaction, react at 160°C for 1 hour, cool to room temperature naturally, wash the conductive glass with deionized water and absolute ethanol in turn, and dry it at 60°C to obtain a light blue color film;

[0045] (4) The obtained conductive glass with thin film was heat-treated at 450 ℃ under the protection of air atmosphere, and kept for 1 h to obtain yellow WO 3 film.

[0046] (5) Three-electrode system is adopted, with WO 3 The FTO conductive glass is used as the working electrode, the Pt sheet is ...

Embodiment 3

[0048] (1) Weigh 0.5 g of ammonium tungstate and dissolve it in 30 ml of water, adjust the pH of the solution to 1 with 6 mol / L HCl solution, stir at 40°C until a colorless and transparent solution is formed, then transfer to 50 ml of high pressure reaction In the polytetrafluoroethylene lining of the kettle;

[0049] (2) Insert the pretreated FTO conductive glass sheet obliquely into the inner lining of the reactor so that the conductive side faces down;

[0050] (3) Seal the reactor tightly and place it in an oven for solvothermal reaction, react at 200 °C for 7 h, cool to room temperature naturally, wash the conductive glass with deionized water and absolute ethanol and dry it at 100 °C to obtain a light cyan film ;

[0051] (4) The obtained conductive glass with thin film was heat-treated at 550 °C under the protection of air atmosphere, and kept for 2 h to obtain yellow WO 3 film.

[0052] (5) Three-electrode system is adopted, with WO 3 The FTO conductive glass is us...

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Abstract

The invention relates to a preparation method for a WO3-LDH (Layered double hydroxide) composite film for photoelectrocatalytic water decomposition. The preparation method comprises the following steps of: dissolving ammonium tungstate and concentrated hydrochloric acid into water to obtain a solution, stirring the solution and transferring the solution into a lining of a high-pressure reaction kettle, and inserting pre-treated conductive glass FTO; then, carrying out solvothermal reaction, naturally cooling the room temperature, washing and drying the conductive glass, and carrying out thermal treatment for at least one hour at a temperature being 450-500 DEG C under air atmosphere, thereby obtaining a WO3 film; and the WO3 film as a working electrode, taking an aqueous solution of nickel nitrate and iron nitrate as electrolyte, depositing NiFe-LDH on the surface of the WO3 film under constant current, finally obtaining the WO3-LDH composite film. The product prepared by the preparation method has high photoelectric conversion efficient, low photooxidation water take-off potential, and has a wide application prospect in the fields such as photocatalytic degradation, photoelectrocatalytic water decomposition, artificial photosynthesis and photo-assisted energy storage batteries.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic materials, in particular to a kind of WO for photocatalytic water splitting 3 -Preparation method of LDH (Layered double hydroxide) composite film. Background technique [0002] In the 1970s, the ever-increasing environmental pollution and energy shortages have made people aware of these two potential global crises. For the sustainable development of human society, it is urgent to develop environmentally friendly non-pollution technology and alternative clean energy. Among many green environmental protection and renewable energy projects, semiconductor photocatalysis technology using natural sunlight energy has become one of the most promising technologies. In 1972, Japanese scholars Fujishima and Honda first reported the TiO 2 The study of photoelectric water splitting on the electrode surface [A. Fujishima and K. Honda. Photolysis-decomposition of water at the surface of an irradiated se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/10
CPCC25B1/04C25B1/55C25B9/73Y02E60/36
Inventor 范晓莉何建平王涛高斌黄现礼郭虎薛海荣龚浩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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