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A single-atom photocatalyst for hydrogen production and its preparation method and application

A catalyst and photocatalytic technology, applied in the field of photocatalytic materials, can solve the problems of cost limitation and high scarcity, and achieve the effects of improved efficiency, good activity and stability

Active Publication Date: 2022-06-03
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, scarcity and high cost limit its further practical application

Method used

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  • A single-atom photocatalyst for hydrogen production and its preparation method and application
  • A single-atom photocatalyst for hydrogen production and its preparation method and application
  • A single-atom photocatalyst for hydrogen production and its preparation method and application

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preparation example Construction

[0030] (2) Preparation of CdS@CDs nanosheets: add 0.01-0.02g Cd(OH) to 60-80mL deionized water 2 @CDs, add 150-200mL of Na Na after freezing for 1-1.5h under magnetic stirring 2 S (3-6mmol / L) solution, react it at room temperature for 10-30min and then add an equal amount of Na again 2 S solution to obtain porous CdS@CDs nanosheets, the product was washed and vacuum dried;

[0031] (3) Preparation of CdS@CDs / Pt-SAs by dipping method: add 15-20 mg of CdS@CDs nanosheets to a beaker containing 8 mL of distilled water, and slowly add another 20 mL of H with a concentration of 0.06 mg / mL dropwise with a peristaltic pump. 2 PtCl 6 The solution was reacted under magnetic stirring for 4 h to obtain the CdS@CDs / Pt-SAs ultra-flake-like structure composite catalyst, and the product was washed and vacuum-dried.

[0032] The present invention develops a new preparation technology of Pt single atoms in CdS@CDs, the photocatalytic hydrogen production efficiency is greatly improved, and the ...

Embodiment 1

[0037] CdS@CDs precursor Cd(OH) 2 Preparation of @CDs:

[0038] Cadmium acetate Cd(CH 3 COO) 2 ·2H 2 O and n-butylamine were dissolved in an appropriate amount of ethylene glycol and carbon dots mixture, stirred for half an hour, and then transferred to a 100 mL reaction kettle for 5 hours at 120 °C to obtain CdS precursor Cd(OH) 2 @CDs nanosheets, the product was washed and vacuum dried.

Embodiment 2

[0040] Preparation of CdS@CDs nanosheets:

[0041] Add 0.01-0.02g Cd(OH) to 60-80mL deionized water 2 @CDs, add 150-200 mL of Na Na after freezing for 1-1.5 h under magnetic stirring 2 S (3-6mmol / L) solution, react it at room temperature for 10-30min and then add an equal amount of Na again 2 S solution, porous CdS@CDs nanosheets were obtained, and the product was washed and vacuum-dried; the obtained brown CdS@CDs could be directly used as a photohydrogen production catalyst.

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Abstract

The present invention provides a novel single-atom photocatalyst for hydrogen production. The photocatalyst for hydrogen production has an ultra-thin porous sheet structure, and the Pt single atom is reduced in situ by abundant groups on the surface of carbon dots (CDs), and the obtained catalyst expresses The formula is CdS@CDs / Pt‑SAs. The photocatalyst for hydrogen production first synthesized cadmium acetate (Cd(CH 3 COO) 2 2H 2 O), n-butylamine (C 4 h 11 N) The ultra-thin Cd(OH) was synthesized in the reaction system of ethylene glycol 2 @CDs nanosheets and convert them into porous CdS@CDs nanosheets. Then, Pt single atoms (Pt‑SAs) were in situ reduced by CDs, and the anchoring of Pt‑SAs on CdS@CDs nanosheets was achieved. Pt single atoms have a strong ability to capture photogenerated electrons, leading to photocatalytic H 2 The evolution activity is remarkable, and its rate reaches 45.5mmol h ‑1 g ‑1 , which is 133 times that of CdS@CDs. The present invention opens up a way to prepare metal single atoms for catalyzing various useful reactions.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a novel single-atom photohydrogen production catalyst formed by a cocatalyst Pt single atom applied to photocatalytic water splitting for hydrogen production and a main catalyst CdS@CDs nanosheet and a preparation method thereof and application. Background technique [0002] Photocatalytic conversion of solar energy into fuels that can be utilized by humans is of great significance. As a widely used energy carrier, hydrogen plays an important role in the synthesis of ammonia and carbon dioxide into methanol and hydrocarbons. Hydrogen fuel production by solar photolysis of water is an effective strategy to alleviate the increasing energy demands of modern society. Therefore, the use of semiconductor photocatalysts for solar water splitting to produce hydrogen has attracted extensive attention at home and abroad. [0003] The key to improving the eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/045C01B3/04
CPCB01J27/045C01B3/042C01B2203/0277C01B2203/1064B01J35/39Y02E60/36
Inventor 安长华邱淑君张维青魏桂涓安超
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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