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Preparation method of cmton type visible light total water splitting catalyst

A catalyst and visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, oxygen preparation, etc., can solve the problems of insufficient utilization of solar energy, low efficiency of all-photon water splitting with visible light, etc., and achieve the promotion of photogenerated electrons and holes. The separation, total water splitting efficiency is high, and the effect of improving stability

Inactive Publication Date: 2017-10-31
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to provide a method for preparing a catalytic material for total visible light water splitting, so as to solve the current problems of low efficiency of visible light full photolytic water splitting and insufficient use of solar energy

Method used

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  • Preparation method of cmton type visible light total water splitting catalyst
  • Preparation method of cmton type visible light total water splitting catalyst
  • Preparation method of cmton type visible light total water splitting catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Calcium chloride, magnesium chloride, tantalum pentachloride and urea in a molar ratio of 6:1:5:400 are accurately weighed and put into methanol water solution (alcohol-water volume ratio 1:1) and stirred to dissolve. Put the above-mentioned mixture into a large crucible and put it directly into a muffle furnace. The heating rate of the programmed temperature rise is 10 ℃ / min, the high temperature setting temperature is 800 ℃, and the holding time of the high temperature stage is 12 h. After natural cooling, the obtained Precursor. The precursor was nitrided in an ammonia atmosphere, the nitriding temperature was 850°C, and the time was 12 hours. After cooling, the CMTON powder was obtained. The purity of its products is not less than 99.85%, and the impurity content: carbon is less than 0.04%; chlorine is less than 0.10%. With CMTON as the main catalyst, after stirring for 24 hours under 300 W xenon light (stirring speed 1000 rpm), the cocatalyst RhCrMnO was first loa...

Embodiment 2

[0048] Calcium nitrate, magnesium nitrate, tantalum pentaethoxide and citric acid are in a molar ratio of 6:1:5:200, accurately weighed and put into methanol aqueous solution (alcohol-water volume ratio 1:1) and stirred to dissolve. Put the above-mentioned mixture into a large crucible and put it directly into a muffle furnace. The heating rate of the programmed temperature rise is 10 ℃ / min, the high temperature setting temperature is 900 ℃, and the holding time of the high temperature stage is 8 hours. After natural cooling, the precursor things. The precursor was nitrided in an ammonia atmosphere, the nitriding temperature was 850°C, and the time was 9 hours. After cooling, the CMTON powder was obtained. The purity of its products is not less than 99.91%, and the impurity content: carbon is less than 0.05%; chlorine is less than 0.02%. With CMTON as the main catalyst, after stirring for 24 hours under 300 W xenon light (stirring speed 1000 rpm), the cocatalyst RhCrMnO was f...

Embodiment 3

[0050] Calcium nitrate, magnesium nitrate, tantalum pentachloride and citric acid are in a molar ratio of 6:1:5:100, accurately weighed and put into methanol aqueous solution (alcohol-water volume ratio 1:1) and stirred to dissolve. Put the above mixture into a large crucible and put it directly into a muffle furnace. The heating rate of the programmed temperature rise is 10 ℃ / min, the high temperature setting temperature is 800 ℃, the holding time of the high temperature stage is 5 h, and after natural cooling, the obtained Precursor. The precursor was nitrided in an ammonia atmosphere, the nitriding temperature was 850°C, and the time was 8 hours. After cooling, the CMTON powder was obtained. The purity of its products is not less than 99.91%, and the impurity content: carbon is less than 0.03%; chlorine is less than 0.04%. With CMTON as the main catalyst, after stirring for 24 hours under 300 W xenon light (stirring speed 1000 rpm), the cocatalyst RhCrMnO was first loaded ...

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Abstract

The invention discloses a preparation method of a CMTON type visible light total water splitting catalyst. After fully dissolving soluble calcium salts, soluble magnesium salts, soluble tantalum salts and combustion auxiliary agents in a methanol-water mixed solution, the process is carried out in a muffle furnace. The temperature is raised and a combustion reaction occurs, and it is kept at a high temperature for a certain period of time. After natural cooling, a precursor is formed, and then the precursor is subjected to a high-temperature nitriding treatment to obtain a CMTON perovskite-type nitrogen oxide powder. CMTON is used as the main catalyst, and after light stirring, the co-catalyst is first loaded, and then the nitrogen inhibitor is coated to make a visible light-responsive total water splitting catalyst. The invention has the advantages of high efficiency and stability, environmental friendliness, easy availability of raw materials and the like. It is a total water splitting catalyst responsive to visible light, can fully convert and utilize solar energy, and is easy to apply and popularize.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a preparation method of a photocatalytic material, in particular to a preparation method of a CMTON visible light total water splitting catalyst. Background technique [0002] Photocatalytic overall water splitting is a hot research topic in the field of photocatalysis. Usually, nanostructured photocatalyst particles dissolved in solution are used. Through contact with these particles in solution, a series of chemical catalytic reactions occur, and finally water is completely decomposed to generate hydrogen and oxygen. This approach differs from the usual method of producing hydrogen and oxygen using separate catalyst-coated electrodes. The main advantage of photocatalytic total water splitting is that it uses photocatalytic materials that are cheaper than those required for photoelectrochemical (PEC) cells. Therefore, it is more affordable for widespread and large-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C01B3/04C01B13/02
CPCY02E60/36Y02P20/133
Inventor 张杰许家胜
Owner BOHAI UNIV
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