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A carbon/molybdenum carbide-coated titanium dioxide composite photocatalytic water decomposition hydrogen production catalyst and its preparation method

A molybdenum carbide coating and composite photocatalysis technology, applied in the field of photocatalysis, can solve the problems of staying, unable to carry out industrial production, limiting the efficiency of hydrogen production by splitting water, etc. The effect of speed increase

Active Publication Date: 2021-08-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the energy band structure of the photocatalyst itself and the difficulty of effectively utilizing the electron holes, its efficiency in cracking water to produce hydrogen is limited, making it still in the laboratory research stage and unable to be industrialized.

Method used

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  • A carbon/molybdenum carbide-coated titanium dioxide composite photocatalytic water decomposition hydrogen production catalyst and its preparation method
  • A carbon/molybdenum carbide-coated titanium dioxide composite photocatalytic water decomposition hydrogen production catalyst and its preparation method
  • A carbon/molybdenum carbide-coated titanium dioxide composite photocatalytic water decomposition hydrogen production catalyst and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Add 1 ml of tetrabutyl titanate to 30 ml of glacial acetic acid, stir for 10 minutes to obtain a white emulsion; transfer the emulsion to a reaction kettle, crystallize at 160 degrees Celsius for 8 hours, and naturally Cool to room temperature, discard the supernatant, wash with deionized water 3 times, and then wash with ethanol 3 times; then dry at 80 degrees Celsius for 12 hours to obtain a white precursor solid;

[0025] (2) taking the dried product of step (1) and roasting at 550 degrees Celsius for 3 hours to obtain a spherical titanium dioxide nano-flower block with a diameter of 1 to 3 microns;

[0026] (3) After fully grinding the titanium dioxide blocks prepared in step (2), weigh 5000 mg and disperse them in 20 ml of deionized water, and stir for 1 hour after ultrasonication for 30 minutes to obtain a white suspension;

[0027] (4) Get 50 mg of ammonium molybdate solid particles and join in the white suspension of step (3), stir for 15 minutes and fully d...

Embodiment 2

[0033] Steps (1)-(2) are the same as in Example 1;

[0034] (3) After fully grinding the titanium dioxide block obtained in step (2), weigh 2000 mg, disperse it in 20 ml of deionized water, and after ultrasonication for 30 minutes, stir for 1 hour to form a white suspension;

[0035] Steps (4)-(7) are the same as in Example 1;

[0036]0.025 grams of the catalyst, 90 milliliters of deionized water and 10 milliliters of triethanolamine are used to form a mixed solution, which is tested by the Beijing Pofilai Photocatalytic Hydrogen Production System and detected by the Shimadzu GC-8A chromatograph. The catalytic hydrogen production rate is 8.81mmol / g*h, which is significantly improved compared with the pure titanium dioxide hydrogen production rate of 0.49mmol / g*h, and the effect is increased by 17.98 times.

Embodiment 3

[0038] Steps (1)-(2) are the same as in Example 1;

[0039] (3) After fully grinding the titanium dioxide block obtained in step (2), weigh 1000 mg, disperse it in 20 ml of deionized water, ultrasonicate for 30 minutes, and stir for 1 hour to form a white suspension;

[0040] Steps (4)-(7) are the same as in Example 1;

[0041] 0.025 grams of the catalyst, 90 milliliters of deionized water and 10 milliliters of triethanolamine are used to form a mixed solution, which is tested by the Beijing Pofilai Photocatalytic Hydrogen Production System and detected by the Shimadzu GC-8A chromatograph. The catalytic hydrogen production rate is 5.16mmol / g*h, which is significantly improved compared with the pure titanium dioxide hydrogen production rate of 0.49mmol / g*h, and the effect is increased by 10.53 times.

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Abstract

A carbon / molybdenum carbide-coated titanium dioxide composite photocatalytic water decomposition catalyst for hydrogen production and a preparation method thereof belong to the technical field of photocatalysis. The invention constructs organic-inorganic hybrid precursors with different molybdenum contents in situ on the surface of titanium dioxide curds, and then forms a stable composite photocatalyst through high-temperature carbonization. In the present invention, nanosheet aggregates on the surface of titanium dioxide flower balls and molybdenum carbide nanoparticles are combined through a graphitized carbon layer to further reduce the recombination of photogenerated electrons and holes. Under the excitation of ultraviolet light, the photogenerated electrons and holes can The photogenerated electrons and holes are effectively separated, and the photogenerated electrons and holes are maximized. At the same time, the composite catalyst provides abundant active catalytic sites, further improving the catalytic efficiency. Compared with pristine TiO2 curds, the photocatalytic hydrogen production reaction rate increased by 18 times from 0.49 mmol / h*g to 8.81 mmol / h*g.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a carbon / molybdenum carbide-coated titanium dioxide composite photocatalytic decomposing water hydrogen production catalyst and a preparation method thereof. Background technique [0002] Fossil fuels are still the main energy used in people's daily life. However, with the depletion of fossil fuels and the environmental and climate problems brought about by them, such as global warming, the development of alternatives to traditional fossil fuels has become the focus of scientific research. The photocatalytic water splitting hydrogen production technology has a wide application prospect in industry because it only needs solar energy and can be converted into pollution-free hydrogen energy. Titanium dioxide-based photocatalysts have been widely studied in the field of photocatalytic water splitting due to their easy availability, high stability, economical and en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22C01B3/04
CPCB01J27/22C01B3/042C01B2203/0277C01B2203/1041B01J35/396B01J35/39Y02E60/36
Inventor 张宗弢张德广王润伟刘文博
Owner JILIN UNIV