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Two-dimensional ZnIn2S4 loaded convex noble metal single atom photocatalyst and application thereof

A photocatalyst, znin2s4 technology, applied in the field of photocatalysis, can solve the problems of low utilization rate and high content of precious metals, and achieve the effects of high utilization rate of Pt, simple process and low cost

Pending Publication Date: 2022-02-08
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photocatalyst prepared by the invention not only improves the problem of high noble metal content and low utilization rate, but also maximizes the catalytic efficiency

Method used

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  • Two-dimensional ZnIn2S4 loaded convex noble metal single atom photocatalyst and application thereof
  • Two-dimensional ZnIn2S4 loaded convex noble metal single atom photocatalyst and application thereof
  • Two-dimensional ZnIn2S4 loaded convex noble metal single atom photocatalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1: Preparation of ZIS nanomaterials and its photocatalytic hydrogen evolution rate test

[0057] The experiment weighed 0.068g ZnCl respectively 2 , 0.293g InCl 3 4H 2 O and 0.300g of sodium citrate were dissolved in a mixed solution containing 5mL of ethylene glycol and 20mL of distilled water, and stirred for 30min until clear. Subsequently, 0.150 g of thioacetamide was added to the solution, and stirring was continued for 30 min until clarification. The transparent solution was transferred to a 50mL polytetrafluoroethylene liner, and then loaded into a stainless steel reactor and reacted at a constant temperature of 120°C in an oven for 12h. After the autoclave is naturally cooled, the ZIS nanomaterials are obtained after centrifugation, washing and freeze-drying.

[0058] 20 mg of ZIS nanosheets were placed in a 100 mL reactor, followed by adding 43 mL of deionized water and 5 mL of triethanolamine, ultrasonically dispersed for 5 min, and then degassed w...

Embodiment 2

[0060] Example 2: Preparation of protruding single-atom Pt / ZIS photocatalyst and its photocatalytic hydrogen evolution rate test

[0061] 20 mg of the ZIS nanosheets prepared in Example 1 were placed in a 100 mL reactor, followed by adding 40 μL of chloroplatinic acid H 2 PtCl 6 Solution, 42.96mL deionized water, 5mL triethanolamine, ultrasonic dispersion treatment for 5min, and then use nitrogen degassing for 30min to remove oxygen in the reaction system. After degassing is complete, place the reactor at 300W with a light intensity of 300mW cm -2 Irradiated under xenon lamp for 3h, the prepared sample was recorded as 0.3wt%Pt / ZIS. While photodepositing Pt single atoms, the gas chromatography was used to sample once an hour, the peak area was recorded, and the hydrogen production and hydrogen evolution rate were calculated. In the present invention, the hydrogen evolution rate of 0.3wt%Pt / ZIS photocatalyst is 350.05μmol h -1 .

[0062] figure 2 It is a dark-field high-r...

Embodiment 3

[0063] Example 3: Preparation of Pt particle / ZIS photocatalyst and its photocatalytic hydrogen evolution rate test

[0064] 20mg of the ZIS nanosheets prepared in Example 1 were placed in a 100mL reactor, followed by adding 0.4mL of chloroplatinic acid H 2 PtCl 6 Solution, 42.6mL deionized water, 5mL triethanolamine, ultrasonic dispersion treatment for 5min, and then use nitrogen degassing for 30min to remove oxygen in the reaction system. After the degassing was completed, the reactor was irradiated under a 300W xenon lamp for 3h, and the prepared sample was recorded as 3wt%Pt / ZIS. While photodepositing Pt particles, gas chromatography was used to sample hourly, record peak area, and calculate hydrogen production and hydrogen evolution rate. In the present invention, the hydrogen evolution rate of 3wt%Pt / ZIS photocatalyst is 23.16μmol h -1 .

[0065] image 3 In a and b are the transmission electron microscope pictures taken under dark field of 0.3wt%Pt / ZIS and 3wt%Pt / ZI...

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Abstract

The invention discloses a two-dimensional ZnIn2S4 loaded convex noble metal single atom photocatalyst and an application thereof. The material is prepared by modifying the surface of ZnIn2S4 with precious metal single atoms through a photo deposition method, the precious metal single atoms are loaded on the surface of two-dimensional ZIS, and the loading capacity is larger than or equal to 0.1 wt% and smaller than or equal to 0.7 wt%. The obtained convex noble metal single atom photocatalyst has a unique structure, excellent catalytic performance and stability and relatively high noble metal utilization rate. The tip enhancement effect can not only effectively improve the separation efficiency of photo-induced electrons and holes, but also promote the thermodynamics and kinetics of photocatalytic hydrogen evolution reaction, thereby improving the photocatalytic hydrogen evolution rate of the photocatalyst. Therefore, the catalyst has good development and application prospects.

Description

technical field [0001] The invention belongs to the field of photocatalysis and relates to a two-dimensional ZnIn 2 S 4 A photocatalyst loaded with a raised noble metal single atom and its application, specifically a raised noble metal single atom modified ZnIn with high activity 2 S 4 photocatalyst and its application in photocatalytic hydrogen evolution reaction. Background technique [0002] Driven by growing environmental concerns, the development of clean and renewable energy has become one of the most pressing challenges of modern society. Hydrogen is one of the most promising new energy carriers due to its high energy density and environmentally friendly combustion products. Therefore, the preparation of highly active photocatalysts has always been a hot and difficult point in the research of solar water splitting and hydrogen evolution. Zn 2 S 4 (ZIS) is a hexagonal two-dimensional layered semiconductor material composed of S-Zn-S-In-S-In-S stacks, because of i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J23/42C01B3/04
CPCB01J27/04B01J23/42C01B3/042B01J35/39B01J35/23Y02E60/36
Inventor 吴诗婷时晓伟
Owner HANGZHOU DIANZI UNIV
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