Oxygen evolution catalyst with low noble metal loading amount for water electrolysis unit

A water electrolyzer and precious metal technology, applied in the field of water electrolysis, can solve the problems such as the inability to greatly reduce the catalyst precious metal content, low precious metal loading, poor electronic conductivity, etc., and achieve improved binding force and electron transfer rate, high electrocatalytic activity. , the effect of strengthening electronic conductivity

Active Publication Date: 2019-04-09
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Among them, transition metal oxides are often used as carriers, but such oxides are semiconductors or insulators and thus have poor electronic conductivity. In order to enhance the activity of the catalyst, the loading of iridium oxide must be greatly improved to pass the high loading (mass Fraction greater than 60%) iridium oxide to make up for the s

Method used

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  • Oxygen evolution catalyst with low noble metal loading amount for water electrolysis unit
  • Oxygen evolution catalyst with low noble metal loading amount for water electrolysis unit
  • Oxygen evolution catalyst with low noble metal loading amount for water electrolysis unit

Examples

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Embodiment 1

[0030] A preparation method for an iridium-titanium composite catalyst, comprising the steps of:

[0031] (1) Get 360mg of chloroiridic acid (mass fraction of iridium in chloroiridic acid is 35%) and add 120mL of pure water, ultrasonic 10min is prepared as the chloroiridic acid solution that iridium concentration is 1mg / mL, adding concentration is 0.1mol / L Sodium hydroxide solution, adjust the pH to about 6, then add 1.08g of powdered titanium with a particle size of 20-200nm, ultrasonically disperse for 10min, and then stir at 25°C for 1h to obtain a mixed solution;

[0032] (2) Nitrogen gas is passed through the mixed solution obtained in step (1) to remove dissolved oxygen, then it is placed in an ice-water bath, and a sodium hydroxide solution with a concentration of 1mol / L is added under stirring conditions, wherein sodium hydroxide and chlorine The molar ratio of iridic acid is 36, and after the dropwise addition is completed, the stirring is continued for 2h under nitro...

Embodiment 2

[0036] A preparation method for an iridium-titanium composite catalyst, comprising the steps of:

[0037](1) Get 36mg of chloroiridic acid and add 120mL of pure water, ultrasonically prepare chloroiridic acid solution with iridium concentration of 0.1mg / mL for 5min, add sodium hydroxide solution with molar concentration of 0.1mol / L, adjust pH to about 6, then Add 0.23g of titanium powder with a particle size of 20-200nm, sonicate for 10min, then stir at 80°C for 2h to obtain a mixed solution;

[0038] (2) Nitrogen gas is passed into the mixed solution obtained in step (1) to remove dissolved oxygen, then it is placed in an ice-water bath, and a sodium hydroxide solution with a molar concentration of 1mol / L is added under stirring conditions, wherein the sodium hydroxide The molar ratio to chloroiridic acid is 1, and after the dropwise addition is completed, the stirring is continued for 0.5h under nitrogen to obtain a precursor solution;

[0039] (3) Place the precursor solut...

Embodiment 3

[0041] A preparation method for an iridium-titanium composite catalyst, comprising the steps of:

[0042] (1) Take 360 ​​mg of chloroiridic acid and add 6 mL of pure water, ultrasonicate for 30 minutes to prepare a chloroiridic acid solution with an iridium concentration of 20 mg / mL, add a sodium hydroxide solution with a concentration of 0.01 mol / L, adjust the pH to about 6, and then add 280mg of titanium powder with a particle size of 20-200nm, ultrasonication for 10min, followed by stirring at 50°C for 0.5h to obtain a mixed solution;

[0043] (2) Nitrogen gas is passed through the mixed solution obtained in step (1) to remove dissolved oxygen, then it is placed in an ice-water bath, and a sodium hydroxide solution with a concentration of 1mol / L is added under stirring conditions, wherein sodium hydroxide and chlorine The molar ratio of iridic acid is 50, and after the dropwise addition is completed, the stirring is continued for 1h under nitrogen condition to obtain a prec...

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Abstract

The invention discloses an oxygen evolution catalyst with a low noble metal loading amount for a water electrolysis unit. According to the oxygen evolution catalyst with the low noble metal loading amount for the water electrolysis unit, the catalyst is an iridium and titanium composite catalyst and is composed of powder titanium and iridium oxide loaded on the surface of the powder iridium; and the mass percent of the iridium oxide is 5 to 30 percent. According to the catalyst provided by the invention, on one hand, metal titanium powder with high metal conductivity is used as a carrier of the catalyst and the electron conductivity of the catalyst is strengthened; on the other and, the iridium and the carrier titanium are tightly combined, a bonding force between the iridium oxide and thecarrier is improved and the electron transfer rate between an active center and the carrier is improved, so that the activity of the catalyst reaches 3 times or more 3 times of that of commercial iridium oxide; and meanwhile, the dosage of the noble metal iridium can be greatly reduced and the mass ratio of the iridium can be reduced to 5 to 30 percent.

Description

technical field [0001] The invention belongs to the field of water electrolysis, in particular to an oxygen evolution catalyst with low noble metal loading used in a water electrolyzer. Background technique [0002] A water electrolyzer is a device that can convert electrical energy into chemical energy, and it is widely used in energy storage of renewable energy power systems and distributed hydrogen production devices. Current water electrolysis systems such as proton exchange membrane water electrolyzers still face the problem of high cost, so further cost reduction is needed to promote the commercialization of this technology. Membrane electrodes are the core components of water electrolyzers, which consist of anode and cathode noble metal catalysts and polymer electrolyte membranes. The catalysts currently used in proton exchange membrane water electrolyzers are all noble metal catalysts, and the amount of noble metals in the membrane electrodes is very high, resulting...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J37/10C25B11/06C25B1/04
CPCB01J23/468B01J37/10C25B1/04C25B11/091Y02E60/36
Inventor 史言闫常峰卢卓信郭常青王志达谭弘毅
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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