A kind of photocatalytic system and preparation method thereof

A catalytic system, photoelectric catalysis technology, applied in the field of photocatalysis, can solve the problems of strong reduction reaction competitiveness, low selectivity of multi-carbon products, etc., and achieve the effect of high catalytic activity

Active Publication Date: 2022-03-01
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reduction reaction of water in aqueous electrolyte is highly competitive, and the selectivity of multi-carbon products is not high.

Method used

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  • A kind of photocatalytic system and preparation method thereof
  • A kind of photocatalytic system and preparation method thereof
  • A kind of photocatalytic system and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] N-doped TiO modified by Au nanocrystals 2 The steps of the preparation method of the nanosheet array are as follows:

[0061] a) FTO glass surface removal treatment: Ultrasonic cleaning and drying of FTO glass in isopropanol, acetone, ethanol and deionized water respectively.

[0062] b) Preparation of TiO on the surface of FTO glass 2 Nanosheet array: adopt hydrothermal method, hydrothermal method is composed of solution and active components, wherein the components and ratio of solution are 50wt% hydrochloric acid, 50wt% water; active components and ratio are: n-butyl titanate , accounting for 1.67wt% of hydrochloric acid and water quality; ammonium fluorotitanate, accounting for 1.6wt% of hydrochloric acid and water quality. Stir the above solution in the polytetrafluoroethylene lining at room temperature for 20 minutes, and then put a piece of FTO conductive glass treated in step a) into the autoclave with the conductive side down, and keep it warm at 170°C for 12...

Embodiment 2

[0076] Copper foam as the base, Zn doped Cu 2 O film preparation method steps are as follows:

[0077]a) Impurity removal treatment on the surface of foamed copper: Soak the foamed copper in 30wt% NaOH solution to remove surface oily impurities, then ultrasonically clean it in deionized water, and dry it for use.

[0078] b) Electrodeposition of Zn-doped Cu on the surface of copper foam 2 O thin film: a three-electrode electrolysis system is adopted, a piece of copper foam treated in step a) is used as the working electrode, the Ag / AgCl electrode and the platinum sheet electrode are used as the reference electrode and the counter electrode respectively, and the electrolyte is composed of a solution and an active component. The components and proportioning of the solution are 70wt% of water, 30wt% of lactic acid, and the active components and proportioning are: copper sulfate (pentahydrate), accounting for 7.1wt% of lactic acid and water quality; zinc sulfate (heptahydrate), a...

Embodiment 3

[0088] Gas program temperature control desorption

[0089] Programmed temperature-controlled desorption can characterize the physical and chemical adsorption capacity of the sample for the target gas. In this example, the CO 2 , CO and CH 4 Three gases, with CO 2 Gas is taken as an example to illustrate the specific embodiment. Firstly, Example 2 and Comparative Example 2 were pretreated at 200°C under He for 1 h, and after cooling to room temperature, they were treated with CO 2 The catalyst was purged for 1 h to saturated adsorption, and the catalyst was purged with He for 30 min, and then the gas desorption experiment was started at a heating rate of 10 °C / min, and the desorbed CO was detected by a mass spectrometer. 2 .

[0090] Figure 10 For Example 2 and Comparative Example 2 For (a) CO 2 , (b) CH 4 And (c) Programmed temperature control of CO gas to remove the figure. As can be seen by comparison, Example 2 for CO 2 and CH 4 The desorption peak area of ​​Zn ...

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Abstract

The invention provides a photoelectric catalysis system, which includes an anode and a cathode; the cathode includes foamed copper and a zinc-doped cuprous oxide film deposited on the surface of the foamed copper. Compared with the prior art, the surface of the cathode of the photocatalytic system provided by the present invention is a zinc-doped cuprous oxide film. The introduction of zinc changes the electron density around copper, resulting in the loss of oxygen vacancies and copper, thereby changing the oxidation rate. The electronic structure of cuprous metal changes the adsorption configuration of the reaction intermediate, so that it has high catalytic activity and can selectively convert CO 2 converted to acetic acid.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a photoelectrocatalysis system and a preparation method thereof. Background technique [0002] At present, human beings still mainly rely on burning fossil fuels to obtain energy, and a large amount of greenhouse gases emitted during the burning process cause many environmental problems. Catalytic reduction of CO 2 Transformation into energy substances with high added value can alleviate the dual pressure on the environment and resources and meet the needs of sustainable development. Common catalytic CO 2 Reduction systems include photocatalysis and electrocatalysis. In the photocatalytic system, by simulating photosynthesis, the use of solar energy can convert CO 2 Catalytic conversion into high value-added products, but photocatalytic CO 2 The conversion process is restricted by the low photoelectric conversion efficiency, the yield of carbon-containing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B9/50C25B11/031C25B11/052C25B11/061C25B11/091C25B3/26C25B3/07C25B3/21C25B9/00C23C14/30C23C14/18C25D9/04
CPCC25B9/00C23C14/30C23C14/18C25D9/04C25B1/02
Inventor 熊宇杰王晓农龙冉
Owner UNIV OF SCI & TECH OF CHINA
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