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A kind of in situ generation perovskite heterojunction photocatalyst and its preparation method

A photocatalyst and in-situ generation technology, applied in the field of photocatalysis, can solve the problems of poor stability and low photocatalytic activity, and achieve the effects of mild reaction, simple synthesis and enhanced activity

Active Publication Date: 2022-05-13
YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of low photocatalytic activity and poor stability of most perovskite quantum dots at present, and propose a method that can improve the photocatalytic activity, change the stability of perovskite quantum dots, the synthesis operation is simple, and the reaction conditions are mild Preparation method of two-phase perovskite heterojunction photocatalyst

Method used

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  • A kind of in situ generation perovskite heterojunction photocatalyst and its preparation method
  • A kind of in situ generation perovskite heterojunction photocatalyst and its preparation method
  • A kind of in situ generation perovskite heterojunction photocatalyst and its preparation method

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Embodiment 1

[0042] A pure phase CsPbBr 3 The preparation method of perovskite quantum dot photocatalyst comprises the following steps:

[0043] All reaction processes were carried out under the protection of argon. Add 27mg of cesium carbonate to 1.4ml of octadecene and 0.2ml of oleic acid mixed solvent, react at 120°C for 1h, fully dissolve the cesium carbonate, and generate a precursor solution containing Cs; in 15ml of octadecene, 1.5ml of oleylamine and Add 207 mg of lead bromide to 1.5 ml of oleic acid mixed solvent, and react at 150°C for 1 hour to fully dissolve lead bromide to generate a Pb-containing precursor solution; quickly inject the Cs-containing precursor solution into the Pb-containing precursor solution through a needle, React at a reaction temperature of 150°C for 5 seconds, quickly put it into the ice-water mixture, and quickly drop the temperature of the solution to 40°C to terminate the reaction of the Pb precursor solution and the Cs precursor solution; In the tub...

Embodiment 2

[0045] A preparation method for in-situ generation of perovskite heterojunction photocatalysts, comprising the following steps:

[0046] All reaction processes were carried out under the protection of argon. Add 27mg of cesium carbonate to 1.4ml of octadecene and 0.2ml of oleic acid mixed solvent, react at 120°C for 1h, fully dissolve the cesium carbonate, and generate a precursor solution containing Cs; in 15ml of octadecene, 1.5ml of oleylamine and Add 207 mg of lead bromide to 1.5 ml of oleic acid mixed solvent, and react at 150°C for 1 hour to fully dissolve lead bromide to generate a Pb-containing precursor solution; quickly inject the Cs-containing precursor solution into the Pb-containing precursor solution through a needle, React at a reaction temperature of 150°C for 5 seconds, quickly put it into an ice-water mixture, rapidly drop the temperature of the solution to 40°C, and terminate the reaction of the Pb-containing precursor solution and the Cs precursor solution;...

Embodiment 3

[0050] A preparation method for in-situ generation of perovskite heterojunction photocatalysts, comprising the following steps:

[0051] All reaction processes were carried out under the protection of argon. Add 27mg of cesium carbonate to 1.4ml of octadecene and 0.2ml of oleic acid mixed solvent, react at 120°C for 1h, fully dissolve the cesium carbonate, and generate a precursor solution containing Cs; in 15ml of octadecene, 1.5ml of oleylamine and Add 207 mg of lead bromide to 1.5 ml of oleic acid mixed solvent, and react at 150°C for 1 hour to fully dissolve lead bromide to generate a Pb-containing precursor solution; quickly inject the Cs-containing precursor solution into the Pb-containing precursor solution through a needle, React at a reaction temperature of 150°C for 5 seconds, quickly put it into an ice-water mixture, rapidly drop the temperature of the solution to 40°C, and terminate the reaction of the Pb-containing precursor solution and the Cs precursor solution;...

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Abstract

The invention discloses an in-situ generated perovskite heterojunction photocatalyst, the photocatalyst is composed of CsPbBr 3 and CsPb 2 Br 5 Two phases exist in the form of heterojunction. The catalyst of the present invention is applied to photocatalytic reduction of carbon dioxide, and the activity is pure phase CsPbBr 3 3.63 times that of perovskite quantum dots; successful construction of homoheterojunctions that retain the pure phase CsPbBr 3 The small size effect and particle confinement effect of perovskite quantum dots improve the separation efficiency of electrons and holes, and enhance the activity and stability of perovskite quantum dot materials. In situ generation of CsPbBr compared to heterojunctions reported by other patents 3 / CsPb 2 Br 5 The perovskite heterojunction photocatalyst does not introduce new elements and is formed by a one-step reaction. The synthesis is simple and the reaction conditions are mild. The invention enables the perovskite quantum dot material to have wide application prospects, and meanwhile has theoretical significance in methodological research.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to an in-situ generated perovskite heterojunction photocatalyst and a preparation method thereof. Background technique [0002] In the past few decades, the energy crisis and the greenhouse effect caused by the carbon dioxide emitted by the combustion of non-renewable chemical fuels have become two major problems facing human society. By capturing carbon dioxide and using renewable energy to further reduce this greenhouse gas into chemical fuels (such as CO, CH 4 , CH 3 OH, etc.) is considered to be one of the most potential solutions, and it has always been a hot topic of the majority of scientific researchers. The reduction of CO2 is complicated by its thermodynamic stability, and despite this issue, photocatalytic CO2 reduction is still regarded as a promising method for the sustainable production of chemicals. [0003] Since halide perovskites were first reported for u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/135B01J37/03C01B32/40
CPCB01J27/135B01J35/004B01J35/0013B01J37/031C01B32/40
Inventor 董帆钟丰忆盛剑平孙艳娟李解元
Owner YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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