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Preparation method of PEM water electrolysis oxygen evolution catalyst iridium oxide

An oxygen catalyst and iridium oxide technology, which is applied in chemical instruments and methods, electrolytic components, electrolytic processes, etc., can solve the problems of low purity of iridium dioxide, failure to meet actual production needs, large particle size of iridium oxide, etc., and achieve the elimination of process Complexity, reduced energy consumption, and high-purity effects

Pending Publication Date: 2022-05-13
QINGDAO CHUANGQI XINNENG CATALYSIS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The particle size of iridium oxide obtained by the above several methods is relatively large, and most of the prepared iridium dioxide has iridium elemental impurities, and the purity of iridium dioxide is low, which cannot meet the actual production needs

Method used

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  • Preparation method of PEM water electrolysis oxygen evolution catalyst iridium oxide
  • Preparation method of PEM water electrolysis oxygen evolution catalyst iridium oxide
  • Preparation method of PEM water electrolysis oxygen evolution catalyst iridium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) 50mg IrCl 3 Dissolve in 15ml of water, add 100mg of KOH to adjust the pH of the solution to 12.

[0033] (2) The solution prepared in step (1) is subjected to ultraviolet hydrolysis and ozone oxidation treatment for 5h to obtain iridium oxide colloidal solution, wherein the ultraviolet light wavelength is 254nm, and the irradiation intensity is 10mW / cm 2 , ozone concentration 20ppm.

[0034] (3) Add 80 μL of concentrated nitric acid to the colloidal solution of iridium oxide prepared in step (2) to adjust the pH of the solution to 7, place in a 90-degree oven for 24 hours to dry and concentrate, and the resulting solid powder is washed three times with deionized water, and dried in an 80-degree oven 12h, thereby making target product IrO 2 .

Embodiment 2

[0036] (1) 100mg H 2 IrCl 6 ·6H 2 O was dissolved in 20ml of water, and 200mg of urea was added to adjust the pH of the solution to 10.

[0037] (2) The solution prepared in step (1) is subjected to ultraviolet hydrolysis and ozone oxidation treatment for 2h to obtain iridium oxide colloidal solution, wherein the ultraviolet light wavelength is 185nm, and the irradiation intensity is 50mW / cm 2 , ozone concentration 40ppm.

[0038] (3) Add 40 μL of concentrated hydrochloric acid to the iridium oxide colloidal solution prepared in step (2) to adjust the pH of the solution to 7, place in a 100-degree oven for 12 hours to dry and concentrate, and the resulting solid powder is washed three times with deionized water, and dried in a 90-degree oven 24h, thereby making target product IrO 2 .

Embodiment 3

[0040] (1) 100mg (NH 4 ) 2 IrCl 6 Dissolve in 30ml of water, add 1ml of concentrated ammonia water (concentration: 30%) to adjust the pH of the solution to 12.

[0041] (2) The solution prepared in step (1) is subjected to ultraviolet hydrolysis and ozone oxidation treatment for 10h to obtain iridium oxide colloidal solution, wherein the ultraviolet light wavelength is 254nm, and the irradiation intensity is 20mW / cm 2 , ozone concentration 30ppm.

[0042] (3) Add 100 μL of concentrated sulfuric acid to the colloidal solution prepared in step (2) to regulate the pH of the solution to 7, place in a 100-degree oven for 10 h to dry and concentrate, and the resulting solid powder is washed three times with deionized water, and dried in a 90-degree oven for 24 hours. Thereby making the target product IrO 2 .

[0043] In the step (2) of the above-mentioned embodiment, both the ultraviolet light hydrolysis and the ozone oxidation reaction are carried out simultaneously at room te...

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Abstract

The invention discloses a preparation method of a PEM water electrolysis oxygen evolution catalyst iridium oxide, which comprises the following steps: (1) dissolving an iridium precursor salt in water, and adding an alkaline substance to regulate the pH value of the solution to 9-13 to obtain an iridium salt solution; (2) placing the iridium salt solution prepared in the step (1) in ultraviolet light and ozone atmosphere for hydrolysis and oxidation reaction to obtain an iridium oxide colloidal solution; and (3) adding an acidic material into the iridium oxide colloidal solution prepared in the step (2) to regulate the pH value of the solution to 7, and then sequentially carrying out drying concentration and washing drying to prepare the target product iridium oxide. The method can eliminate the characteristics of complex process, easy sintering and agglomeration of particles, low purity of prepared iridium oxide and the like in the traditional preparation method, the prepared catalyst iridium oxide has the advantages of small particle size, uniform particle size range distribution and high purity, the preparation process is simple, the repeatability is good, the energy consumption can be obviously reduced, the selected chemical reagent has low price, and the method is suitable for industrial production. The method is suitable for large-scale batch production.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a preparation method of iridium oxide, a PEM (proton exchange membrane) water electrolysis oxygen catalyst. Background technique [0002] PEM electrolyzed water technology has high current density, small size of electrolyzer, flexible operation, and is conducive to rapid load change. It has a good match with wind power and photovoltaics (the volatility and randomness of power generation are large). Different from alkaline water electrolysis hydrogen production, PEM water electrolysis hydrogen production uses perfluorosulfonic acid proton exchange membrane with good chemical stability, proton conductivity and gas separation as solid electrolyte instead of asbestos membrane, which can effectively prevent electron transfer and improve Electrolyzer safety. The bottleneck of PEM water electrolysis for hydrogen production is cost and lifetime. Existing commercial oxygen ...

Claims

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Application Information

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IPC IPC(8): C01G55/00C25B1/04C25B1/50C25B11/075B82Y30/00B82Y40/00
CPCC01G55/004C25B11/075C25B1/04C25B1/50B82Y30/00B82Y40/00C01P2002/72C01P2004/04C01P2004/64Y02E60/36
Inventor 赵宏
Owner QINGDAO CHUANGQI XINNENG CATALYSIS TECH CO LTD