Alloy electrocatalyst for ultra-stable PEM oxygen evolution reaction and preparation method thereof

A technology of electrocatalyst and oxygen evolution reaction, applied in the direction of non-precious metal oxide coating, electrode, electrode coating, etc., can solve the problems of easy corrosion, catalyst change, PEM electrolysis hydrogen production equipment overall performance attenuation, etc., to achieve ultra-high Stability, simple preparation process, suitable for large-scale industrial production

Active Publication Date: 2021-04-09
新余市金通科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong acidity of the proton exchange membrane, which is equivalent to 0.5M H2SO4 or 1M HClO4, Ir, Ru Such precious metals and other inorganic oxides are easily corroded in strong oxidizing environment and strong acidic medium, which will change the catalyst and bring about the attenuation of the overall performance of PEM electrolytic hydrogen production equipment.
In order to solve the problem of the stability of the anode catalyst, it is still of great significance to develop a catalyst with high activity and high stability in the field of industrial PEM electrolysis of water.

Method used

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  • Alloy electrocatalyst for ultra-stable PEM oxygen evolution reaction and preparation method thereof
  • Alloy electrocatalyst for ultra-stable PEM oxygen evolution reaction and preparation method thereof
  • Alloy electrocatalyst for ultra-stable PEM oxygen evolution reaction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this example, the nominal composition of the alloy we choose is W 80 Ir 20 , the preparation of the electrocatalyst material is as follows:

[0033](1) Master alloy ingot preparation: according to the nominal composition W of the master alloy 80 Ir 20 The alloy raw materials W and Ir (purity 98.0-99.9wt%) are mixed, and then under the protection of high-purity Ar atmosphere, arc melting is carried out. The melting current is 200A-300A. In order to ensure the uniform composition of the alloy, the master alloy is repeatedly turned over in the furnace Melting more than four times to obtain a master alloy ingot.

[0034] (2) Alloy casting molding: The uniform master alloy ingot in step (1) is melted again by electric arc melting, and then the molten alloy is infiltrated into the water-cooled copper mold by negative pressure suction casting, and the alloy melt is in the copper mold. Medium cooling to obtain a W with a diameter of 2mm 80 Ir 20 Electrocatalyst rods. ...

Embodiment 2

[0038] In this example, the nominal composition of the alloy we choose is W 60 Ir 40 , the preparation method of the electrocatalyst material is the same as in Example 1.

[0039] The alloy of gained is carried out acidic oxygen evolution reaction performance test, and test adopts three-electrode device, and test scheme is identical with embodiment 1, W 60 Ir 40 Alloy electrode material reaches 10mA / cm 2 The overpotential required for the catalytic current density is as low as about 300mV. Prepared W 60 Ir 40 The alloy electrocatalyst electrode can operate stably in 0.5mol / L sulfuric acid electrolyte for more than 1000h, and still maintain high electrocatalytic activity, and the overpotential rise rate within 1000 hours is less than 4μV / h. prove W 60 Ir 40 The alloy electrode material has electrocatalytic oxygen evolution activity.

Embodiment 3

[0041] In this example, the nominal composition of the alloy we choose is Mo 80 Ir 20 , the preparation method of the electrocatalyst material is the same as in Example 1.

[0042] The obtained alloy is subjected to acidic oxygen evolution reaction performance test, and the test adopts a three-electrode device, and the test scheme is the same as in Example 1, Mo 80 Ir 20 Alloy electrode material reaches 10mA / cm 2 The overpotential required for the catalytic current density is as low as 643mV. Prepared Mo 80 Ir 20 The alloy electrocatalyst electrode can operate stably in 0.5mol / L sulfuric acid electrolyte for more than 1000h, and still maintain high electrocatalytic activity, and the overpotential rise rate within 1000 hours is less than 7μV / h. prove Mo 80 Ir 20 The alloy electrode material has electrocatalytic oxygen evolution activity.

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PUM

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Abstract

The invention discloses an alloy electrocatalyst for an ultra-stable PEM oxygen evolution reaction. The alloy electrocatalyst is a (W, Mo, Nb, Ta, Zr, Hf, Re, Os)-Ir block alloy material, the specific component of the alloy is (W, Mo, Nb, Ta, Zr, Hf, Re, Os)<x>-Ir<y>, x is greater than or equal to 60 and less than or equal to 80, y is greater than or equal to 20 and less than or equal to 40, and x and y are atomic percentages of the elements. The invention further discloses a preparation method of the alloy electrocatalyst for the ultra-stable PEM oxygen evolution reaction. An electric arc furnace is adopted for smelting and casting molding, and the method is simple, easy to operate and suitable for large-scale industrial production. The material can be directly used as an oxygen evolution reaction electrode, shows excellent electrochemical oxygen evolution activity in an acid medium, and can stably work for more than 1000 hours under the condition of high current density. The material can be used as an anode of an industrial acidic water electrolysis hydrogen production device, and is beneficial to large-scale application of a proton exchange membrane water electrolysis technology.

Description

technical field [0001] The invention relates to an alloy electrocatalyst and a preparation method thereof, belonging to the application field of electrocatalysis materials, in particular to an alloy electrocatalyst used for an ultra-stable PEM oxygen evolution reaction and a preparation method thereof. Background technique [0002] Under the trend of energy transformation and green development, the utilization efficiency of renewable energy such as hydropower, wind power, photovoltaic, and biomass in China has been significantly improved, and the installed capacity and power generation capacity of renewable energy in energy consumption have grown steadily. The proportion of renewable energy has steadily increased, and the consumption structure has been transformed to clean and low-carbon. In the storage and use of energy based on renewable energy, hydrogen production by electricity will become an important part, and hydrogen will also develop into an important energy carrier...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/046C22C27/04C22C1/02C22C27/02C22C16/00C22C27/00C22C5/04C22C28/00
CPCC25B1/04C25B11/04C22C27/04C22C1/02C22C27/02C22C16/00C22C27/00C22C5/04C22C28/00Y02E60/36Y02P20/133
Inventor 胡飞李睿熊宇杰
Owner 新余市金通科技有限公司
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