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Cuprous oxide/cuprous sulfide/nickel sulfide three-layer photoelectrode and preparation and application thereof

A cuprous oxide and cuprous sulfide technology, which is applied in the field of photoelectrodes, can solve the problems of reducing the photoelectric conversion efficiency or hydrogen production in the catalytic process, no reports of cuprous oxide photoelectrodes, and reducing the reactivity of catalysts. High reduction efficiency, improved photocorrosion resistance, and low cost

Active Publication Date: 2020-06-16
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However pure Cu 2 O as a photocatalyst has the following two disadvantages: (1) The electrons and holes generated by photoexcitation are easy to recombine on the surface of the catalyst and convert into thermal energy, thereby reducing the photoelectric conversion efficiency or hydrogen production of the catalytic process; (2) due to Cu 2 Cu in O is in an intermediate valence state (+1) and is easily oxidized, making it difficult to preserve the catalyst, and it is prone to photocorrosion to reduce the reactivity of the catalyst.
[0005] At present, there is no report about the cuprous oxide photoelectrode modified with cuprous sulfide and nickel sulfide simultaneously.

Method used

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  • Cuprous oxide/cuprous sulfide/nickel sulfide three-layer photoelectrode and preparation and application thereof
  • Cuprous oxide/cuprous sulfide/nickel sulfide three-layer photoelectrode and preparation and application thereof

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preparation example Construction

[0032] The preparation method of cuprous oxide / cuprous sulfide / nickel sulfide three-layer photoelectrode of the present invention comprises the following steps:

[0033] 1) Electrodeposition of cuprous oxide (Cu 2 O) film; including:

[0034] Sodium hydroxide (NaOH) solution was used to dissolve copper sulfate (Cu 2 SO 4 ) and trisodium citrate to adjust the pH value of the mixed aqueous solution to 10.8 to 11.5, and at a temperature of 60°C to 70°C, use tin dioxide glass (FTO glass) as a carrier, silver / silver chloride (Ag / AgCl) As reference electrode 9, platinum sheet electrode is as counter electrode 8, with the standard electrode potential of silver / silver chloride (Ag / AgCl) reference electrode as standard, under the condition of -0.4V, on the tin dioxide glass carrier Deposit 0.5~2h to prepare cuprous oxide (Cu 2 O) Thin film light.

[0035] 2) Using anion exchange method in cuprous oxide (Cu 2 O) film prepared cuprous sulfide (Cu 2 S) thin film, obtain cuprous oxi...

example 1

[0042] Prepared CuSO 4 (0.05M) and trisodium citrate (0.05M) mixed solution 50mL, then use 1M (1 mole per liter) NaOH solution to adjust the pH value of the mixed solution to 11.0, use an oil bath to adjust the pH value and mix The solution was heated to 65°C, and then tin dioxide glass (FTO) (1cm×2cm) was used as a carrier electrode, silver / silver chloride (Ag / AgCl) was used as a reference electrode, and a platinum sheet electrode was used as a counter electrode. The standard electrode potential of the silver chloride (Ag / AgCl) reference electrode is the standard, and it is deposited on the tin dioxide glass carrier under the condition of -0.4V for 2h, and Cu is prepared on the tin dioxide glass carrier. 2 O film. Then it will be prepared with Cu 2 The tin dioxide glass carrier of the O film is immersed in 1M sodium sulfide solution for 1min and taken out, and blown dry with nitrogen, forms a cuprous sulfide film on the cuprous oxide film, thereby obtains cuprous oxide / cupr...

example 2

[0044] Formulated Cu 2 SO 4 (0.06M) and trisodium citrate (0.06M) mixed solution 50mL, then the pH value of described mixed solution is adjusted to 11.0 with 1M (1 mole per liter) NaOH solution, utilizes oil bath to adjust the pH value after The mixed solution was heated to 65°C, and then tin dioxide glass (FTO) (1cm×2cm) was used as the carrier electrode, silver / silver chloride (Ag / AgCl) was used as the reference electrode, and the platinum sheet electrode was used as the counter electrode. The standard electrode potential of the silver chloride (Ag / AgCl) reference electrode is the standard, and it is deposited on the tin dioxide glass carrier for 0.5h under the voltage of -0.4V, and the Cu is prepared on the tin dioxide glass carrier. 2 O film. Then it will be prepared with Cu 2 The tin dioxide glass carrier of O thin film is immersed in the sodium sulfide solution of 1M 2min, takes out, and blows dry with nitrogen, forms cuprous sulfide thin film on cuprous oxide thin fi...

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Abstract

The invention discloses a cuprous oxide / cuprous sulfide / nickel sulfide three-layer photoelectrode and preparation and application thereof. The cuprous oxide / cuprous sulfide / nickel sulfide three-layerphotoelectrode comprises a stannic oxide glass carrier, and a cuprous oxide film, a cuprous sulfide film and a nickel sulfide film are sequentially arranged on the conductive surface of the stannic oxide glass carrier from inside to outside. The preparation method comprises the following steps: preparing a cuprous oxide film on a stannic oxide glass carrier through electro-deposition; preparing acuprous sulfide film on the cuprous oxide film by adopting an anion exchange method to obtain a cuprous oxide / cuprous sulfide double-layer compound; and preparing nickel sulfide on the cuprous sulfidefilm by adopting a cation exchange method to obtain a cuprous oxide / cuprous sulfide / nickel sulfide three-layer compound so as to form the cuprous oxide / cuprous sulfide / nickel sulfide three-layer photoelectrode. The cuprous oxide / cuprous sulfide / nickel sulfide photocatalytic electrode prepared by the method does not contain noble metal, is relatively low in cost, simple in preparation process andhigh in photoelectric reduction efficiency, and has the characteristic of high catalytic activity when being used for reduction of nitroaromatic hydrocarbon.

Description

technical field [0001] The invention relates to a photoelectrode. In particular, it relates to a cuprous oxide / cuprous sulfide / nickel sulfide three-layer photoelectrode and its preparation and application. Background technique [0002] Water pollution caused by industrial production is a serious problem in the 21st century. Nitroaromatic compounds have high stability due to the existence of a strong electron-drawing group nitro, which is difficult to degrade in the natural environment. Reducing the nitro group and converting it into an amino group, since the amino group is an electron-donating group, can effectively improve the degradable activity of the aromatic compound. The reduction of existing nitroaromatic compounds requires strong reducing substances such as iron powder or sodium borohydride, and the cost is relatively high. Photoelectrochemical catalytic technology can combine photoelectric conversion and electrocatalysis to convert solar energy into electrical ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B3/04C25B3/25
CPCC25B3/25C25B11/091
Inventor 彭文朝李昕彤王欢齐纶
Owner TIANJIN UNIV
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