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Platinum supported nitrogen-doped molybdenum disulfide photocatalyst and preparation method thereof

A technology of molybdenum disulfide and photocatalyst, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of molybdenum disulfide and hydrogen generation, etc. Achieve and stabilize hydrogen production capacity, good repeatability and simple operation

Active Publication Date: 2016-06-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretically, molybdenum disulfide also has the ability to decompose water with visible light to produce hydrogen, but because the conduction band position of molybdenum disulfide is too low, it is too close to the reduction potential of water, and the photogenerated electrons excited by visible light are not enough to reduce hydrogen ions in water to generate hydrogen gas. Therefore, molybdenum disulfide has not been used alone as a photocatalyst for visible light catalytic water splitting to produce hydrogen.

Method used

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Embodiment 1

[0039] Step 1: at room temperature, 2.72g of sodium molybdate dihydrate (NaMoO 4 2H 2 (2) and 5.44g thioacetamide were stirred and dissolved in 60mL deionized water successively, and the resulting mixed solution (the concentration of sodium molybdate dihydrate was 45.3g / L, and the concentration of thioacetamide was 90.7g / L) at room temperature After stirring for 6 hours, it was transferred to a polytetrafluoroethylene-lined hydrothermal kettle (filling degree 60%) for hydrothermal reaction, and crystallized at 200 ° C for 24 hours; after the hydrothermal kettle was lowered to room temperature, the resulting black precipitate Wash with deionized water and ethanol and dry in vacuum at 50°C for 24h to obtain black powdery molybdenum disulfide nanosheets;

[0040] Step 2: Get the 0.3g molybdenum disulfide nanosheet powder obtained in step 1 and place it in a high-temperature tube furnace for high-temperature treatment. In the high-temperature treatment process, keep the 100mL / min...

Embodiment 5

[0047] Step 1: At room temperature, dihydrate sodium molybdate (NaMoO 4 2H 2 (2) and thioacetamide are stirred and dissolved in deionized water successively, and the resulting mixed solution (the concentration of sodium molybdate dihydrate is 40g / L, and the concentration of thioacetamide is 40g / L) is transferred to after stirring at room temperature for 6h Carry out hydrothermal reaction in the hydrothermal still (filling degree 55%) that polytetrafluoroethylene liner is housed, crystallize 48h at 205 ℃; Washing with ethanol and drying in vacuum at 60°C for 42 hours to obtain black powdery molybdenum disulfide nanosheets;

[0048] Step 2: Get the 0.3g molybdenum disulfide nanosheet powder obtained in step 1 and place it in a high-temperature tube furnace for high-temperature treatment. In the high-temperature treatment process, the tube furnace maintains an ammonia atmosphere of 110mL / min, and the high-temperature treatment temperature is 450°C, the treatment time is 1.5h; w...

Embodiment 6

[0054] Step 1: At room temperature, dihydrate sodium molybdate (NaMoO 4 2H 2 (2) and thioacetamide are stirred and dissolved in deionized water successively, and the resulting mixed solution (the concentration of sodium molybdate dihydrate is 50g / L, and the concentration of thioacetamide is 150g / L) is transferred to after stirring at room temperature for 6h Carry out hydrothermal reaction in the hydrothermal still (filling degree 65%) that polytetrafluoroethylene liner is housed, crystallize 42h at 210 ℃; Washing with ethanol and drying in vacuum at 70°C for 36 hours to obtain black powdery molybdenum disulfide nanosheets;

[0055] Step 2: Get the 0.3g molybdenum disulfide nanosheet powder obtained in step 1 and place it in a high-temperature tube furnace for high-temperature treatment. In the high-temperature treatment process, keep 120mL / min of ammonia gas in the tube furnace. The high-temperature treatment temperature is 550°C, the treatment time is 1.2h; when the tempera...

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Abstract

The invention provides a platinum supported nitrogen-doped molybdenum disulfide photocatalyst and a preparation method thereof. The method comprises the following steps: with sodium molybdate and thioacetamide as raw materials, preparing molybdenum disulfide nanoplates via a hydrothermal method; performing thermal treatment on the molybdenum disulfide nanoplates in an ammonia atmosphere to obtain nitrogen-doped molybdenum disulfide nanoplates; and finally, loading precious metal platinum on the nitrogen-doped molybdenum disulfide nanoplates via a photo reduction method to obtain the platinum supported nitrogen-doped molybdenum disulfide photocatalyst. With the platinum supported nitrogen-doped molybdenum disulfide photocatalyst, molybdenum disulfide is taken as a photocatalyst to produce hydrogen from water by visible light catalytic decomposition for the first time. The platinum supported nitrogen-doped molybdenum disulfide photocatalyst has excellent visible light catalytic hydrogen production capability and excellent stability. The preparation method is simple to operate, the photocatalyst is good in repeatability, and the application of molybdenum disulfide in the aspects of photocatalysis and electrochemistry is expanded.

Description

technical field [0001] The invention belongs to the field of hydrogen energy preparation, and relates to a photocatalytic clean preparation technology of hydrogen energy, that is, a photocatalytic hydrogen production technology using water as a raw material under the condition of simulating sunlight and visible light irradiation, and specifically relates to a nitrogen-doped molybdenum disulfide-supported platinum photocatalyst and its preparation method. Background technique [0002] In today's world, with the gradual depletion of traditional fossil energy such as oil, coal and natural gas, and the increasingly serious environmental problems, human beings are about to face the crisis of energy depletion. Therefore, the development of clean and renewable energy is a research direction that governments all over the world attach great importance to. New energy sources with development potential today include solar energy, geothermal energy, wind energy, ocean energy, nuclear e...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCC01B3/042B01J23/42B01J27/24C01B2203/1082C01B2203/107B01J35/39Y02E60/36
Inventor 师进文张亚周胡逾超郭烈锦
Owner XI AN JIAOTONG UNIV
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