A kind of antimony sulfide-based heterojunction photocathode and its preparation method and application

A technology based on antimony sulfide and antimony sulfide, applied in the direction of electrodes, electrolytic components, electrolytic process, etc., can solve the problems of difficult to obtain industrial application, high technical process requirements, high cost of ALD method, etc., achieve excellent utilization prospects, simple operation, Slow down the effect of photocorrosion

Active Publication Date: 2021-08-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of the ALD method is high, the technical requirements are high, and it is difficult to obtain large-scale industrial applications.

Method used

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  • A kind of antimony sulfide-based heterojunction photocathode and its preparation method and application
  • A kind of antimony sulfide-based heterojunction photocathode and its preparation method and application
  • A kind of antimony sulfide-based heterojunction photocathode and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0041] The preparation of an antimony sulfide-based heterojunction photocathode comprises the following steps:

[0042] 1) A network-like antimony sulfide thin film was grown on an ITO glass substrate by a hydrothermal method. The specific steps are:

[0043] ① Prepare an aqueous solution containing 30mM antimony potassium tartrate and 60mM thioacetamide;

[0044] ② Put the solution in step ① in a hydrothermal kettle containing a polytetrafluoroethylene liner, place the cleaned ITO glass substrate vertically in a polytetrafluoroethylene shelf, transfer them to the hydrothermal kettle together, and carry out Hydrothermal reaction, heat preservation at 150°C for 8 hours and then cool in the furnace. After the reaction is completed, the reaction product is cleaned and dried to obtain a dark red antimony sulfide film;

[0045] 2) The ultra-thin titanium dioxide layer was prepared by cathodic electrodeposition. Specific steps are as follows:

[0046] ① Configure 20ml of 0.1M me...

Embodiment 2

[0051] Preparation method is with embodiment 1, and difference is:

[0052] In step 1), the concentration of antimony potassium tartrate is 50mM; the concentration of thioacetamide is 100mM; the time of hydrothermal reaction is 16h.

[0053] The surface SEM image of the antimony sulfide-based heterojunction photoelectrode obtained after heat treatment is as follows figure 2 As shown, it is a uniform network structure.

[0054] In the above-described embodiment, in step 2), the three-electrode system used in the electrodeposition method uses a standard Ag / AgCl electrode as a reference electrode, a platinum wire as a counter electrode, and a conductive glass deposited with an antimony sulfide light-absorbing layer as a working electrode; The current is -0.1mA / cm 2 to -1mA / cm 2 , the time is 100s-1000s.

[0055] The UV absorption spectrum of the antimony sulfide-based heterojunction photocathode prepared above is as follows image 3 As shown, the absorption cut-off edge is ...

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Abstract

The invention discloses an antimony sulfide-based heterojunction photocathode and its preparation method and application. The structure consists of conductive glass, antimony sulfide light-absorbing layer, ultra-thin titanium dioxide layer and promoter layer from bottom to top. The antimony sulfide light-absorbing layer has a network structure; the thickness of the ultra-thin titanium dioxide layer is 5-10nm. The preparation method is as follows: sequentially depositing an antimony sulfide light-absorbing layer, an evenly covered ultra-thin titanium dioxide layer, and a co-catalyst layer on the conductive glass. In the present invention, the antimony sulfide material with nano-morphology is used as the light-absorbing material of the photocathode for the first time, and a photoelectrode with strong light absorption in the visible spectrum and high photoresponse characteristics is obtained through structural design. The equipment used in the invention is simple, easy to operate, and the preparation process is green and non-toxic. The photoelectrode film grows uniformly and has good crystal quality, which is conducive to large-scale production and application, and has broad development prospects.

Description

technical field [0001] The invention belongs to the field of photoelectric catalysis, and in particular relates to an antimony sulfide-based heterojunction photocathode, a preparation method and application thereof. Background technique [0002] Hydrogen energy is one of the most efficient and clean energy sources, and the utilization of hydrogen energy is of great significance to energy shortage and environmental protection. Photoelectrochemical (PEC) water splitting is an important method to convert solar energy into hydrogen energy. The challenge for the large-scale application of photocatalytic water splitting is how to prepare photoelectrodes with high efficiency, low cost and good stability. In recent years, antimony sulfide has attracted attention due to its superior visible light properties. Antimony sulfide is a stable V-VI inorganic compound semiconductor material. It is abundant in the earth's crust and is non-toxic. Antimony sulfide is a direct bandgap semico...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/069C25B1/04
CPCC25B1/04Y02E60/36
Inventor 朱丽萍王彦文
Owner ZHEJIANG UNIV
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