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A kind of cobalt oxide catalyst and its preparation and application

A technology of cobalt oxide and catalyst, which is applied to high-activity amorphous cobalt oxide catalyst and its preparation, and the application field of photocatalytic water oxidation, which can solve the problem of low activity

Active Publication Date: 2020-07-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, some progress has been made in cobalt-based photocatalytic water oxidation catalysts, but the activity is still low

Method used

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  • A kind of cobalt oxide catalyst and its preparation and application
  • A kind of cobalt oxide catalyst and its preparation and application
  • A kind of cobalt oxide catalyst and its preparation and application

Examples

Experimental program
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Embodiment 1

[0023] Weigh 10 g of Tris powder, add 100 mL of water to dissolve, add 30 wt% HCl dropwise with stirring until the pH of the solution is 8, add water to make the tris concentration 1M. Take 9mL of 100mM Tris solution configured above, and add 1mL of 30mM Co(NO 3 ) 2 solution, add 0.05mL 3wt% H under stirring at room temperature 2 o 2 . Continue stirring for 5 minutes to obtain cobalt oxide particles dispersed in water at a concentration of 3 mM, which is brown in color and designated as 1# catalyst. Analysis by electron microscopy shows that the particle size of cobalt oxide nanoparticles is about 2 nanometers, and its particle size is small and uniformly dispersed. For details, see figure 1 . By XRD analysis, it can be seen that the prepared cobalt oxide particles are amorphous, see figure 2 .

Embodiment 2

[0025] Weigh 10 g of Tris powder, add 100 mL of water to dissolve, add 30 wt% HCl dropwise with stirring until the pH of the solution is 8, add water to make the tris concentration 1M. Take 9mL of 50mM Tris solution configured above, and add 1mL of 30mM Co(NO 3 ) 2 solution, add 0.05mL 3wt% H under stirring at room temperature 2 o 2 . Continue to stir for 5 minutes to obtain cobalt oxide particles dispersed in water at a concentration of 3 mM, which is brown in color and designated as 2# catalyst. Analysis by electron microscope shows that the average particle size of the cobalt oxide particles is about 2.5 nanometers. XRD analysis shows that the prepared cobalt oxide particles are amorphous.

Embodiment 3

[0027] Weigh 10 g of Tris powder, add 100 mL of water to dissolve, add 30 wt% HCl dropwise with stirring until the pH of the solution is 8, add water to make the tris concentration 1M. Take 9mL of 25mM Tris solution configured above, and add 1mL of 30mM Co(NO 3 ) 2 solution, add 0.05mL 3wt% H under stirring at room temperature 2 o 2 . Continue stirring for 5 minutes to obtain cobalt oxide particles dispersed in water at a concentration of 3 mM, which are brown in color and designated as 3# catalyst. Analysis by electron microscope shows that the average particle size of the cobalt oxide particles is about 3 nanometers. XRD analysis shows that the prepared cobalt oxide particles are amorphous.

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Abstract

A cobalt oxide catalyst dispersed in water and protected with trishydroxymethylaminomethane molecules, wherein the active component is amorphous cobalt oxide nanoparticles. Preparation process: Add Co(NO 3 ) 2 solution to coordinate trishydroxymethylaminomethane molecules with cobalt ions, and then add the oxidant H under stirring at room temperature. 2 O 2 , obtaining amorphous cobalt oxide nanoparticles with a particle size of 2-6 nanometers. This catalyst is used for photocatalytic water oxidation reaction, with a conversion frequency of 8.7 seconds. –1 (>31000h –1 ), has excellent catalytic properties.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a highly active amorphous cobalt oxide catalyst, a preparation method thereof and an application in photocatalytic water oxidation. Background technique [0002] As the source of electrons and protons in the artificial photosynthesis system, water oxidation involves the transfer of 4 electrons and 4 protons, and is one of the key factors restricting the conversion of solar energy into chemical energy. Therefore, it is of great significance to develop efficient, stable and cheap photocatalytic water oxidation catalysts for the preparation of solar fuels by artificial photosynthesis. Cobalt-based compounds have attracted widespread attention as photocatalytic water oxidation catalysts due to their low cost and high activity. The development of new and efficient cobalt-based catalysts has made some progress in recent years. [0003] LaCoO was reported by Fukuzumi et al. 3 As a c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75C02F1/72
CPCC02F1/725B01J23/75C02F2305/10B01J35/39
Inventor 李灿陈政章福祥
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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