High-load precious metal monatomic catalyst as well as preparation method and application of high-load precious metal monatomic catalyst

A high-load, precious metal technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as reducing the electrocatalytic performance of materials, and achieve short cycle times, improved catalytic performance, and good dispersion. sexual effect

Inactive Publication Date: 2018-11-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The crystals or particles of these generated noble metals will reduce the electrocatalytic performance of the material

Method used

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  • High-load precious metal monatomic catalyst as well as preparation method and application of high-load precious metal monatomic catalyst
  • High-load precious metal monatomic catalyst as well as preparation method and application of high-load precious metal monatomic catalyst
  • High-load precious metal monatomic catalyst as well as preparation method and application of high-load precious metal monatomic catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] To prepare the carbon-supported single-atom platinum catalyst, 100 mg (0.1 g) of nitrogen-doped carbon black was thoroughly ground, put it into a 500 mL beaker, added 4 mL of 0.01 M chloroplatinic acid solution, and added deionized water to 250 mL. The chloroplatinate ions are fully adsorbed on the carbon carrier after being treated by stirring, ultrasonic, shaking and vacuum environment. After that, the separation operation is carried out. First, the above solution is extracted, then washed with deionized water, washed with potassium hydroxide several times, and then washed with deionized water until neutral. Collect the filter cake, dry it naturally, and grind it for later use. Spread the above powder on a glass plate, select a UV lamp with a power of 10 W and a wavelength of 254 nm, make the distance between the UV lamp and the sample 10 cm, and irradiate for 1 hour to obtain a final single-atom platinum catalyst loading of 6.9 wt%.

Embodiment 2

[0034] To prepare a carbon-supported single-atom platinum catalyst, 100 mg of nitrogen-doped graphene was thoroughly ground, put it into a 500 mL beaker, added 6 mL of 0.01 M chloroplatinic acid solution, and added deionized water to 250 mL. The chloroplatinate ions are fully adsorbed on the carbon carrier after being treated by stirring, ultrasonic, shaking and vacuum environment. After that, the separation operation is carried out. First, the above solution is extracted, then washed with deionized water, washed with potassium hydroxide several times, and then washed with deionized water until neutral. Collect the filter cake, dry it naturally, and grind it for later use. Spread the above powder on a glass plate, select a UV lamp with a power of 10 W and a wavelength of 254 nm, make the distance between the UV lamp and the sample 10 cm, and irradiate for 1 hour to obtain a final single-atom platinum catalyst loading of 9.8 wt%.

Embodiment 3

[0036]To prepare a carbon-supported single-atom platinum catalyst, 100 mg of nitrogen-doped carbon black was thoroughly ground, put it into a 500 mL beaker, added 0.1 mL of 0.01 M chloroplatinic acid solution, and added deionized water to 250 mL. The chloroplatinate ions are fully adsorbed on the carbon carrier after being treated by stirring, ultrasonic, shaking, vacuum environment and the like. After that, the separation operation is carried out. First, the above solution is extracted, then washed with deionized water, washed with potassium hydroxide several times, and then washed with deionized water until neutral. Collect the filter cake, dry it naturally, and grind it for later use. Spread the above powder on a glass plate, select a UV lamp with a power of 10 W and a wavelength of 254 nm, make the distance between the UV lamp and the sample 10 cm, and irradiate for 1 hour to obtain a final single-atom platinum catalyst loading of 0.13 wt%.

[0037] figure 1 Under the c...

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Abstract

The invention relates to a high-load precious metal monatomic catalyst as well as a preparation method and application of the high-load precious metal monatomic catalyst. The high-load precious metalmonatomic catalyst is prepared by adsorbing precious metal acid radical ions or salt ions by taking a nitrogen-doped carbon material as a carrier, and then, radiating the obtained precursor powder byusing ultraviolet with a certain strength for a period of time. The catalyst has high active site density and high precious metal utilization ratio and shows excellent performances in reactions such as electrically-catalyzed hydrogen precipitation, oxygen reduction and oxygen precipitation.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a high-load noble metal single-atom catalyst and its preparation method and application, in particular to a noble metal single-atom catalyst prepared by a photochemical solid-phase reduction method and its application. Background technique [0002] Due to the increasingly prominent problems of environmental pollution and energy crisis, it is very important to develop and utilize green and environmentally friendly renewable energy. In this situation, environment-friendly and resource-saving energy conversion devices and storage devices have become research hotspots in the field of new energy, including fuel cells, metal-air batteries, and electrolyzed water devices. Oxygen reduction, oxygen evolution and hydrogen evolution are some important reactions involved in the above-mentioned electrochemical energy conversion devices. In order to promote these react...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B1/02C25B11/08
CPCC25B1/02C25B11/04B01J27/24B01J35/33
Inventor 王峰刘景军李团锋宋夜
Owner BEIJING UNIV OF CHEM TECH
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