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Photocatalyst, preparation method thereof and method for producing hydrogen by photolysis of water

A photocatalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen production, etc., can solve the problem that the valence band and conduction band potentials cannot be satisfied at the same time, the utilization rate of sunlight is low, and the quantum efficiency is reduced, etc. problem, to achieve the effect of improving migration and separation efficiency, excellent photocatalytic production, and improving utilization rate

Pending Publication Date: 2021-07-16
TCL CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The key to hydrogen production by photolysis of water lies in the selection of suitable photocatalysts, however, early photocatalysts such as TiO 2 Most of them respond to ultraviolet light, ultraviolet light accounts for 5% of sunlight energy, the utilization rate of sunlight is too low, and the valence band and conduction band potential cannot meet the needs of catalytic reactions at the same time. At the same time, due to various Defects make it easy for photogenerated electrons and holes to recombine at the defect, resulting in reduced quantum efficiency and high cost.
So far, there is no cheap and commercially available material that meets all the conditions of high visible light quantum efficiency, stability, safety and cheapness

Method used

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  • Photocatalyst, preparation method thereof and method for producing hydrogen by photolysis of water
  • Photocatalyst, preparation method thereof and method for producing hydrogen by photolysis of water
  • Photocatalyst, preparation method thereof and method for producing hydrogen by photolysis of water

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Embodiment approach

[0031] As an embodiment, the first semiconductor nanosheet is a main catalyst, and the second semiconductor nanosheet is a co-catalyst, forming a photocatalyst loaded on the co-catalyst and having good photocatalytic hydrogen production activity.

[0032] As an implementation, such as figure 1 As shown, the first semiconductor nanosheet 1, the two-dimensional carbon nanomaterial 2 and the second semiconductor nanosheet 3 are stacked in sequence.

[0033] The first semiconductor nanosheet, the two-dimensional carbon nanomaterial, and the second semiconductor nanosheet all have a sheet-like structure, and the first semiconductor nanosheet, the two-dimensional carbon nanomaterial, and the second semiconductor nanosheet are sequentially stacked to form a sandwich-like structure. photocatalyst with composite structure. On the one hand, the formed photocatalyst has a larger interface contact area, and makes the contact between the layers closer, and promotes the rapid transfer of p...

Embodiment 1-3

[0077] This embodiment provides a photocatalyst g-C 3 N 4 / RGO / MoS 2 , its preparation method specifically includes:

[0078] 1. Preparation of g-C 3 N 4

[0079] Put 10 g of urea into the crucible, place it in a muffle furnace for calcination at 600°C for 2 hours, and heat up at a rate of 5°C / min. The calcined product is washed with distilled water, filtered, dried in an oven, and ground to obtain g-C 3 N 4 .

[0080] 2. Preparation of graphene oxide (GO)

[0081] Add 360mL of concentrated sulfuric acid and 40mL of phosphoric acid to 3g flake graphite, mechanically stir in an ice-water bath for 10min, then add 18g of potassium permanganate, stir for 30min and mix well, heat in a water bath at 50°C for 24h, add 300mL of distilled water after the reaction is completed, then mechanically stir for 1h, slowly drop Add 20mL of 30% hydrogen peroxide, and the reaction solution gradually turns from brown to golden yellow. After centrifugation, soak in 500mL of 5% hydrochloric...

Embodiment 4-6

[0091] This embodiment provides a photocatalyst CdS / acetylene black / MoS 2 , its preparation method specifically includes:

[0092] 1. Preparation of Cds nanosheets

[0093] 0.4g sublimated sulfur powder and 0.45g CdCl 2 2.5H 2 O was dissolved in 75mL of diethylenetriamine (DETA) and stirred for 1h to mix well, the mixture was transferred to a 100mL polytetrafluoroethylene-lined reaction kettle, heated to 80°C in an oven and kept for 45h, and then naturally cooled to room temperature A pale yellow product was obtained by centrifugation at 3000 rpm. Then the product was washed three times with deionized water and absolute ethanol respectively, and dried in a vacuum oven at 60° C. for 8 h to obtain CdS nanosheets.

[0094] 2. Preparation of MoS 2 Nanosheets

[0095] Dissolve 0.48g of sodium molybdate and 0.8g of thioacetamide in 60mL of deionized water and continue to stir for 1h to obtain a clear solution; then, transfer the clear solution to a 100mL polytetrafluoroethylen...

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Abstract

The invention belongs to the technical field of hydrogen production through water photolysis, and particularly relates to a photocatalyst, a preparation method thereof and a method for producing hydrogen through water photolysis. The photocatalyst provided by the invention comprises a first semiconductor nanosheet, a two-dimensional carbon nanomaterial loaded on the first semiconductor nanosheet, and a second semiconductor nanosheet loaded on the two-dimensional carbon nanomaterial. In the provided photocatalyst, the first semiconductor nanosheet is used as a main catalyst, the second semiconductor nanosheet can be used as a cocatalyst, and the two-dimensional carbon nanomaterial is a conductive material with a sheet structure and can be used as a bridge for connecting and conducting the main catalyst and the cocatalyst, so that the migration and separation efficiency of photo-induced electron-hole pairs is improved; and internal recombination of photo-induced electron-hole pairs is weakened, so that the utilization rate of photo-induced electrons is greatly improved, and the photocatalyst has high photocatalytic hydrogen production activity and good stability.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by photolysis of water, and in particular relates to a photocatalyst and a preparation method thereof, and a method for production of hydrogen by photolysis of water. Background technique [0002] Hydrogen energy, as the most attractive clean and carbon-free energy, is an ideal substitute for fossil fuels, but the existing industrial technology is not suitable for the production of hydrogen for fuel use. The use of photocatalytic technology to convert solar energy into hydrogen is considered to be one of the most promising ways to produce hydrogen, which is expected to fundamentally solve the problems of energy shortage and environmental pollution. [0003] Photocatalytic reaction is the reaction process of converting solar energy into chemical energy with high energy density and storing it in chemical bonds by using the structural characteristics of semiconductors. Semiconductor mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/047B01J27/051B01J27/24C01B3/04
CPCB01J27/24B01J27/051B01J27/047C01B3/042C01B2203/0277C01B2203/1076C01B2203/1041B01J35/39Y02E60/36
Inventor 马松刘文勇
Owner TCL CORPORATION
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