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Preparation of cdsnrs@nisilicate ultrathin nanosheet composite and its application in hydrogen evolution reaction

A technology of composite materials and nanosheets, which is applied in the field of preparation of CdSNRs@NiSilicate composite materials, can solve the problems of enhanced hydrogen production activity, low hydrogen production activity, and poor stability, and achieves improved charge separation efficiency, improved photocatalytic activity, and excellent performance effect

Active Publication Date: 2021-06-08
NORTHWEST NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CdS NRs are CdS nanorods, which solve the problem of enhancing the hydrogen production activity of cadmium sulfide visible light photocatalysts. They also have photogenerated electron-hole pairs that are easily recombined, and are easily affected by photocorrosion. The hydrogen production activity is low, and Poor stability and other issues

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  • Preparation of cdsnrs@nisilicate ultrathin nanosheet composite and its application in hydrogen evolution reaction
  • Preparation of cdsnrs@nisilicate ultrathin nanosheet composite and its application in hydrogen evolution reaction
  • Preparation of cdsnrs@nisilicate ultrathin nanosheet composite and its application in hydrogen evolution reaction

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Embodiment Construction

[0030] The preparation, optical properties and hydrogen production performance of CdS NRs@NiSilicate of the present invention will be further described through specific examples below.

[0031] 1. Preparation of CdS NRs: 12.5 mmol Cd(NO 3 ) 2 4H 2 O, 37.5 mmol CH 4 N 2 S was dropped into 60 ml of ethylenediamine, the mixture was transferred into an autoclave, and heated at 160 °C for 24 h, the product was collected by centrifugation, then washed several times with ethanol and distilled water, and dried to obtain CdS NRs.

[0032] 2. CdS NRs@SiO 2 Preparation: Dissolve 10 mg of CdS NRs nanorods in a mixed solution containing deionized water (10%), ammonia water (2%), and ethanol (88%), stir vigorously for 30 min, and then sonicate for 40 min; then take 1 mL (0.2~ 0.3 mg) TEOS was added to the mixture and stirred at room temperature for 4 h; the product was collected by centrifugation, washed with ethanol and deionized water, and then dried at 60 °C to obtain CdS NRs@SiO 2...

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Abstract

The invention discloses a preparation method of CdSNRs@NiSilicate ultra-thin nano-sheet composite material. First, a silane layer is loaded on the surface of CdS NRs, and then nickel nitrate is added to form nickel silicate; intermediate carbon dioxide is eliminated in the hydrothermal treatment process. The silicon layer forms a CdS@NiSilicate nanostructure, and NiSilicate nanosheets act as a protective layer to inhibit the phototransfer of CdS, promote the charge separation in CdS, and form a heterojunction between CdS NRs and NiSilicate. This unique 1D‑ The 2D nanostructured NiSilate nanosheets with a large number of active sites have significantly increased specific surface area, accelerated electron transport and greatly improved performance, showing excellent performance in photocatalytic hydrogen production.

Description

technical field [0001] The invention relates to a preparation method of a CdSNRs@NiSilicate composite material, which is mainly used as a photocatalyst in hydrogen evolution reaction. Background technique [0002] The increasingly severe energy crisis and environmental pollution caused by the burning of fossil fuels have prompted people to actively search for renewable and environmentally friendly alternative energy sources. Since hydrogen energy can convert solar energy into storable chemical energy, it is an important alternative energy source. CdS is an effective photocatalyst for H under visible light due to its high activity and sufficient negative flat-band potential. 2 The most commonly used photocatalysts generated. However, pure CdS is a direct bandgap semiconductor, photogenerated electron-hole pairs are easily recombined, and are easily affected by photocorrosion, with low hydrogen production activity and poor stability. Therefore, it is necessary to find ways ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/043C01B3/04
CPCY02E60/36
Inventor 李云娇王其召黄静伟佘厚德王磊
Owner NORTHWEST NORMAL UNIVERSITY