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Atom dispersion water oxidation catalyst and preparation and application thereof

An atomic dispersion and water oxidation technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. The effect of low preparation cost, good catalytic stability and broad application prospects

Active Publication Date: 2018-05-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its catalytic activity is very high, but the stability is poor, only a few seconds of stability, not suitable for practical applications

Method used

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  • Atom dispersion water oxidation catalyst and preparation and application thereof
  • Atom dispersion water oxidation catalyst and preparation and application thereof
  • Atom dispersion water oxidation catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 40mg of manganese nitrate, 0.5g of graphene oxide and 100mL of water were sonicated in a 250mL beaker for 4 hours, then stirred at room temperature for 4 hours to mix well, and then the mixture was dried in air at 80°C. Finally, the obtained solid was ground into powder, and calcined at 700° C. for 4 hours in ammonia gas to obtain a black powder. Stir the obtained black powder in 5mol / L nitric acid solution at 80°C for one hour, filter, wash with water, and dry at 80°C, which is the catalyst with dispersed manganese atoms (Mn-G). The content of manganese in the catalyst is about 0.1%. The properties are shown in Table 1.

[0038] from Figure 1 to Figure 3 In the scanning and projection and spherical aberration transmission electron microscope given in , it can be found that the metal manganese in the catalyst we synthesized is mainly dispersed in the graphene framework at the atomic level.

Embodiment 2

[0040] 40mg of ferric nitrate, 0.5g of graphene oxide and 100mL of water were sonicated in a 250mL beaker for 4 hours, then stirred at room temperature for 4 hours to mix well, and then the mixture was dried in air at 80°C. Finally, the obtained solid was ground into powder, and calcined at 500° C. for 4 hours in ammonia gas to obtain a black powder. The obtained black powder was stirred in 5 mol / L nitric acid solution at 80°C for one hour, filtered, washed with water, and dried at 80°C to obtain a catalyst with dispersed iron atoms (Fe-G). performance see Figure 8 .

Embodiment 3

[0042] 40mg of nickel nitrate, 0.5g of graphene oxide and 100mL of water were sonicated in a 250mL beaker for 4 hours, then stirred at room temperature for 4 hours to mix well, and then the mixture was dried in air at 80°C. Finally, the obtained solid was ground into powder, and calcined at 500° C. for 4 hours in ammonia gas to obtain a black powder. The obtained black powder was stirred in 5 mol / L nitric acid solution at 80°C for one hour, filtered, washed with water, and dried at 80°C to obtain a nickel atom-dispersed catalyst (Ni-G). performance see Figure 8 .

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Abstract

The invention relates to an atom dispersion water oxidation catalyst and a preparation method and application thereof. The method comprises the steps that firstly, metal ions and nonmetal atoms are embedded into a carbon-based material framework; and generated oxides are removed through acid treatment, so that the atom dispersion catalyst is obtained. By means of the method, the dispersive atom catalyst containing the metal ions such as vanadium, chromium, manganese, iron, cobalt, nickel, copper, ruthenium, palladium, silver, cadmium, iridium and lead can be prepared. The metal ions in a material synthesized through the method are mainly embedded into the framework of a carbon-based carrier in the form of single atoms, and the metal loading amount can reach 1.5% or above by weight. The catalytic performance of the atom dispersion catalytic material prepared through the method can compare favorably with that of PSII in the nature; the preparation cost is low; and the wide application prospect can be achieved in the processes of water decomposition conducted through electro-catalysis, water decomposition conducted through photoelectrocatalysis, water decomposition conducted through photo-catalysis and manual photosynthesis carbon dioxide reduction and conversion.

Description

technical field [0001] The present invention relates to an atomically dispersed water oxidation catalyst, in particular to an atomically dispersed manganese catalyst for water oxidation. The invention also relates to atomically dispersed catalysts such as vanadium, chromium, iron, cobalt, nickel, copper, ruthenium, palladium, silver, cadmium, iridium, lead and nitrogen and their application in water oxidation. These atomically dispersed catalysts can be applied in electrocatalytic water splitting, photocatalytic water splitting, and photocatalytic water splitting processes. Background technique [0002] Simulate the photosynthesis of green plants, using sunlight to convert H 2 O and CO 2 converted to O 2 And carbohydrates can not only solve the increasingly severe energy crisis faced by human beings, but also improve the environmental problems caused by the use of fossil fuels. Whether it is photolysis of water or photoreduction of carbon dioxide, the oxidation of water ...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/06B01J23/34B01J23/26B01J23/745B01J23/75B01J23/755B01J23/889
CPCC25B1/04B01J23/26B01J23/34B01J23/745B01J23/75B01J23/755B01J23/8892C25B1/55C25B11/075B01J35/39Y02E60/36
Inventor 李灿管景奇章福祥韩洪宪李军
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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