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Ni2P/NiS@C heterojunction photocatalyst for fully decomposing water, and preparation method thereof

A photocatalyst and heterojunction technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of narrow band gap and low photocatalytic activity, and achieve strong electronic lifetime, The preparation method is simple and the effect of promoting spatial separation

Active Publication Date: 2020-03-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure transition metal phosphides have a narrow band gap, and electrons and holes are easy to recombine, and their photocatalytic activity is often low.

Method used

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  • Ni2P/NiS@C heterojunction photocatalyst for fully decomposing water, and preparation method thereof
  • Ni2P/NiS@C heterojunction photocatalyst for fully decomposing water, and preparation method thereof
  • Ni2P/NiS@C heterojunction photocatalyst for fully decomposing water, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The Ni used for total water splitting 2 The preparation method of P / NiS@C heterojunction photocatalyst comprises the following steps:

[0034] 1) Add 0.2g of Ni(NO 3 ) 2 Add to 30mL of water, then add 1.5mmoL of polyvinylpyrrolidone, 0.5mmoL of citric acid, 2mmoL of cysteine, 0.2mmoL of octadecylamine, stir well and slowly add 4mmoL of Na 2 S, after stirring for 12 hours, add the mixed solution and its precipitate into a 50mL polytetrafluoroethylene autoclave, and conduct a hydrothermal reaction at 110°C for 3 hours. and water for several times, centrifuged and freeze-dried to obtain NiS@C nanosheets.

[0035] 2) Weigh 0.1g of NiS@C nanosheets and 0.4g of sodium hypophosphite, place them separately in porcelain boats, and wrap them tightly with tinfoil.

[0036] 3) Put the porcelain boat into the tube furnace, blow in nitrogen, and then calcinate the sample at 400°C for 2 hours to obtain Ni for total water splitting 2 P / NiS@C heterojunction photocatalyst.

Embodiment 2

[0038] The Ni used for total water splitting 2 The preparation method of P / NiS@C heterojunction photocatalyst comprises the following steps:

[0039] 1) Add 0.15g of Ni(NO 3 ) 2Add to 10mL of water, then add 2mmoL of polyvinylpyrrolidone, 1mmoL of citric acid, 1mmoL of cysteine, 0.5mmoL of octadecylamine, stir well and slowly add 2mmoL of Na 2 S. After stirring for 12 hours, the mixed solution and its precipitate were added to a 50mL polytetrafluoroethylene autoclave, and hydrothermally reacted at 100°C for 5 hours. After the reaction was completed, the reaction vessel was cooled to room temperature. Washed with water for several times, centrifuged and freeze-dried to obtain NiS@C nanosheets.

[0040] 2) Weigh 0.1g of NiS@C nanosheets and 1g of sodium hypophosphite, place them separately in porcelain boats, and wrap them tightly with tin foil;

[0041] 3) Put the porcelain boat into a tube furnace, blow in nitrogen, and then calcinate the sample at 300°C for 5 hours to obt...

Embodiment 3

[0043] The Ni used for total water splitting 2 The preparation method of P / NiS@C heterojunction photocatalyst comprises the following steps:

[0044] 1) Add 0.5g of Ni(NO 3 ) 2 Add it to 45mL of water, then add 1mmoL of polyvinylpyrrolidone, 0.4mmoL of citric acid, 0.5mmoL of cysteine, 0.7mmoL of octadecylamine, etc., stir well and slowly add 8mmoL of Na 2 S. After stirring for 12 hours, add the mixed solution and its precipitate into a 50mL polytetrafluoroethylene autoclave, and conduct a hydrothermal reaction at 130°C for 3 hours. After the reaction is completed, cool the reaction vessel to room temperature, and wash the reaction product with ethanol and Washed with water several times, centrifuged, and freeze-dried to obtain NiS@C nanosheets;

[0045] 2) Weigh 0.1g of NiS@C nanosheets and 0.5g of sodium hypophosphite, place them separately in porcelain boats, and wrap them tightly with tin foil;

[0046] 3) Put the porcelain boat into a tube furnace, blow in nitrogen ga...

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Abstract

The invention discloses a Ni2P / NiS@C heterojunction photocatalyst for fully decomposing water, and a preparation method thereof. The Ni2P / NiS@C heterojunction photocatalyst is prepared from Ni(NO3)2,water, polyvinylpyrrolidone, citric acid, L-cysteine, octadecylamine and sodium hypophosphite. The photocatalyst has a high photocatalytic activity, and the preparation method is simple.

Description

technical field [0001] The invention belongs to the technical field of energy catalysis, and relates to a Ni 2 P / NiS@C heterojunction photocatalyst and its preparation method. Background technique [0002] Photocatalytic materials can directly decompose water to produce hydrogen and oxygen under the irradiation of sunlight, which is an ideal and challenging solar energy conversion technology. In the photocatalytic water splitting system, photogenerated electrons are used to produce hydrogen, and photogenerated holes are used to produce oxygen. In the whole reaction process, steps such as the generation and separation of photogenerated electrons and holes, and the respective interface hydrogen evolution and hydrogen evolution reaction are very important in the whole reaction process. In recent years, many studies on photocatalytic water splitting have been reported. Many scholars have successfully solved the problem of narrow spectral absorption range of conventional semico...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J37/10B01J37/08B01J37/28C01G53/11C01B25/08C01B32/15B82Y40/00B82Y30/00C01B3/04
CPCB01J27/1853B01J37/10B01J37/28B01J37/082C01G53/11C01B25/08C01B32/15B82Y40/00B82Y30/00C01B3/042C01P2004/80B01J35/39Y02E60/36
Inventor 杨贵东严孝清黄宇
Owner XI AN JIAOTONG UNIV
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