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Gallium phosphide photocatalyst for photolysis of water to produce hydrogen and preparation method of gallium phosphide photocatalyst

A technology for photo-splitting water for hydrogen production and photocatalyst, which is applied in physical/chemical process catalysts, chemical instruments and methods, hydrogen production, etc. Easy to obtain and improve the effect of photocatalytic efficiency

Inactive Publication Date: 2018-12-21
张玉英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the application of gallium phosphide as a catalyst for photo-splitting water to produce hydrogen is seldom. The main reason is that gallium phosphide has the defects of easy recombination of photogenerated electron-hole pairs, low catalytic activity and low catalytic efficiency. Gallium phosphide photocatalysts that inhibit the recombination of photogenerated electrons and holes and have high catalytic efficiency are of great significance

Method used

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  • Gallium phosphide photocatalyst for photolysis of water to produce hydrogen and preparation method of gallium phosphide photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Mechanically grind gallium phosphide particles into powder, ultrasonically disperse them in deionized water and let them stand for a certain period of time, take the supernatant, centrifuge and dry, continue to add the obtained powder into N,N-dimethylacetamide, ultrasonically After dispersing, let it stand for a certain period of time, take the supernatant and centrifuge and dry it to obtain micronized gallium phosphide powder; the time for ultrasonic dispersion in deionized water is 16 minutes, and the resting time is 70 minutes; in N,N-dimethylacetamide The time for ultrasonic dispersion is 36 minutes, and the standing time is 130 minutes;

[0027] (2) Disperse the micronized gallium phosphide powder and electron acceptor compound prepared in step (1) in absolute ethanol, transfer them to a high-energy ball mill for mixed ball milling, and obtain a mixed dispersion; the electron acceptor compound is iron Potassium cyanide; the rotating speed of the ball mill is 6...

Embodiment 2

[0030] (1) Mechanically grind gallium phosphide particles into powder, ultrasonically disperse them in deionized water and let them stand for a certain period of time, take the supernatant, centrifuge and dry, continue to add the obtained powder into N,N-dimethylacetamide, ultrasonically After dispersing, let it stand for a certain period of time, take the supernatant and centrifuge and dry it to obtain micronized gallium phosphide powder; the time for ultrasonic dispersion in deionized water is 12 minutes, and the resting time is 80 minutes; in N,N-dimethylacetamide The time of ultrasonic dispersion is 32min, and the standing time is 130min;

[0031] (2) Disperse the micronized gallium phosphide powder and electron acceptor compound prepared in step (1) in absolute ethanol, transfer them to a high-energy ball mill for mixed ball milling, and obtain a mixed dispersion liquid; the electron acceptor compound is heavy Potassium chromate; the rotational speed of the ball mill is 6...

Embodiment 3

[0034] (1) Mechanically grind gallium phosphide particles into powder, ultrasonically disperse them in deionized water and let them stand for a certain period of time, take the supernatant, centrifuge and dry, continue to add the obtained powder into N,N-dimethylacetamide, ultrasonically After dispersion, stand for a certain period of time, take the supernatant and centrifuge and dry to obtain micronized gallium phosphide powder; the time for ultrasonic dispersion in deionized water is 18 minutes, and the standing time is 80 minutes; in N,N-dimethylacetamide The time of ultrasonic dispersion is 38min, and the standing time is 140min;

[0035] (2) Disperse the micronized gallium phosphide powder and electron acceptor compound prepared in step (1) in absolute ethanol, transfer them to a high-energy ball mill for mixed ball milling, and obtain a mixed dispersion liquid; the electron acceptor compound is high Potassium manganate; the rotational speed of the ball mill is 750r / min, ...

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Abstract

The invention belongs to the technical field of hydrogen production by photolysis water, and provides a gallium phosphide photocatalyst for photolysis of water to produce hydrogen and a preparation method of the gallium phosphide photocatalyst. The method comprises the following steps: performing micronized treatment on gallium phosphide particles to obtain gallium phosphide powder, then ball-milling and recombining the gallium phosphide powder with an electron acceptor compound, and finally loading porous carbon nanotubes with the recombined product, so as to prepare the gallium phosphide photocatalyst for photolysis of water to produce hydrogen. Compared with the conventional method, the gallium phosphide photocatalyst prepared by the invention shortens the electron migration distance, can capture photo-generated electrons and provide a channel for electron transfer, inhibits the recombination process of photo-generated electrons and electron-hole pairs, and improves catalytic activity and catalytic efficiency.

Description

technical field [0001] The invention belongs to the technical field of photolysis of water to produce hydrogen, and provides a gallium phosphide photocatalyst and a preparation method for photolysis of water to produce hydrogen. Background technique [0002] Hydrogen energy, as a secondary energy source, has many advantages such as cleanness, high efficiency, safety, storability, and transportability. It has been generally regarded as the most ideal pollution-free green energy in the new century, so it has been highly valued by various countries. . Evolution of heterogeneous photocatalysis from electrolytic water splitting to semiconducting photocatalytic water splitting for hydrogen production with electrodes and TiO 2 The successive discoveries of photocatalysts other than photocatalysts have led to the research on photocatalytic decomposition of water to produce hydrogen (referred to as photolysis of water), and great progress has been made in the synthesis and modificat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/14C01B3/04
CPCC01B3/042B01J27/14C01B2203/0277C01B2203/1041B01J35/39Y02E60/36
Inventor 张玉英
Owner 张玉英
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