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An ag with visible light response 2 znsns 4 /mo structured photoanode and its preparation method and application

A structured light and visible light technology, applied in chemical instruments and methods, electrodes, chemical/physical processes, etc., to achieve excellent photoelectric conversion efficiency

Active Publication Date: 2020-09-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, currently Ag 2 ZnSnS 4 Research on photocatalysts is mainly used in powder hydrogen generation and solar cell light absorbing layers, etc., and there is little research on Ag 2 ZnSnS 4 Research Report on Hydrogen Production from Water Splitting as Photoanode in Photoelectrolyte Cell

Method used

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  • An ag with visible light response <sub>2</sub> znsns <sub>4</sub> /mo structured photoanode and its preparation method and application
  • An ag with visible light response <sub>2</sub> znsns <sub>4</sub> /mo structured photoanode and its preparation method and application
  • An ag with visible light response <sub>2</sub> znsns <sub>4</sub> /mo structured photoanode and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1 Ag 2 ZnSnS 4 Preparation of / Mo structured photoanode

[0055] (1) Ultrasonic cleaning of molybdenum mesh:

[0056] First use 5mol / L concentrated hydrochloric acid and 5mol / L concentrated sodium hydroxide solution to ultrasonically clean for 1.0 hours (frequency 40KHz), then use acetone, deionized water and ethanol to ultrasonically clean for 1.0 hour (frequency 40KHz), after ultrasonic cleaning The surface of molybdenum mesh presents a metallic luster.

[0057] (2) Deposit metal Ag:

[0058] First configure 100ml of 0.01mol / L silver nitrate solution, and then deposit metallic silver on the molybdenum grid by controlling the deposition voltage and deposition charge. The deposition voltage is 0.0V Vs SCE (calomel electrode), and the deposition charge is 0.8C / cm 2 , to obtain the Ag / Mo precursor.

[0059] (3) Deposit metal Sn:

[0060] First configure the 0.02mol / L stannous chloride solution of 100ml, then deposit metal tin on the Ag / Mo net by control...

Embodiment 2

[0065] Example 2 Ag with different Zn / Sn / Ag deposition charges 2 ZnSnS 4 Preparation of / Mo structured photoanode This example prepares Ag with different Zn / Sn / Ag deposition charges 2 ZnSnS 4 / Mo structure photoanode, prepared 2 kinds of photoanodes altogether, its preparation method is the same as embodiment 1, difference is: the first kind is to deposit these three kinds of metal elements in step (2)(3)(4) in embodiment 1 The simultaneous reduction of charge is: 0.4C / cm 2 (Ag), 0.8C / cm 2 (Sn), 0.8C / cm 2 (Zn); the second is to increase the amount of these three kinds of metal element deposition charge in step (2) (3) (4) in embodiment 1 while being: 1.2C / cm 2 (Ag), 2.4C / cm 2 (Sn), 2.4C / cm 2 (Zn). However, these two Ag 2 ZnSnS 4 The ratio of deposited charges in the Zn / Sn / Ag precursor in the / Mo structured photoanode remains 2.0:2.0:1.0.

[0066] Schematic diagram of a synthetic photoanode:

[0067] Embodiment 1 and 2 prepare Ag 2 ZnSnS 4 The specific steps o...

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Abstract

The present invention provides an Ag with visible light response 2 nnJC 4 / Mo structured photoanode and its preparation method and application. The method includes using a molybdenum mesh as a base, using silver nitrate as a silver source, stannous chloride as a tin source, and zinc chloride as a zinc source to respectively electrodeposit silver, tin, and zinc on the molybdenum mesh, and then sulfide Calcined. This method has the advantages of simplicity, mild reaction conditions, low cost and no pollution, and has high commercial application prospects. Ag 2 nnJC 4 / Mo structure photoanode has very high photoelectric conversion efficiency and can be used in fields such as solar cells, photoelectrocatalysis and photocatalysis. Through experimental research, it was found that Ag 2 nnJC 4 / Mo structured photoelectrode has a photocurrent density exceeding 4mA / cm in photoelectrochemical tests 2 , the photoelectric conversion efficiency reaches 25% in the main light-absorbing area. What is important is that the photoelectrochemical test in the composed electrolytic cell showed excellent hydrogen evolution performance.

Description

technical field [0001] The invention relates to the fields of new energy and photoelectrochemical technology, in particular to an Ag with visible light response 2 ZnSnS 4 / Mo structured photoanode and its preparation method and application. Background technique [0002] With the gradual depletion of non-renewable energy such as oil, coal and natural gas, clean and renewable energy has become a common goal pursued by mankind. Because hydrogen has the advantages of high energy density, green environmental protection and renewable, it is considered as a new generation of energy in the 21st century. As we all know, photocatalysts and photoelectrodes absorb sunlight to generate photoelectrons, and reduce water molecules to generate hydrogen. This is the most ideal way to obtain hydrogen energy in the future. The photoelectric catalytic reaction mechanism refers to the photogenerated electron-hole pairs generated by light irradiation on the surface of the semiconductor electrod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/051C25B11/04C25B11/08
CPCC25B1/04C25B11/04B01J27/0515B01J35/39Y02E60/36Y02P20/133
Inventor 张倩倩梁希壮王朋黄柏标张晓阳秦晓燕王泽岩郑昭科刘媛媛
Owner SHANDONG UNIV
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