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Ultra-stable electrocatalyst material for efficient acidic oxygen evolution reaction and preparation method thereof

An electrocatalyst and oxygen evolution reaction technology, which is applied in electrode coatings, non-precious metal oxide coatings, electrodes, etc., can solve the problems of inability to meet industrial conditions, slow electrochemical oxygen evolution reaction, and lower reaction energy barriers. Insufficient long-term service stability, suitable for large-scale industrial production, and simple preparation process

Active Publication Date: 2021-03-30
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, the electrochemical oxygen evolution reaction is kinetically slow, and efficient catalysts are needed to lower the reaction energy barrier, thereby accelerating the oxygen evolution reaction.
[0003]In recent years, people have developed a large number of efficient and stable electrocatalyst materials for the basic oxygen evolution reaction. However, highly active and stable electrocatalysts for the oxygen evolution reaction The lack of acidic electrolyzed water has greatly hindered the extensive commercialization of acidic electrolyzed water, especially considering that the electrocatalytic reaction in the acidic PEM (proton exchange membrane) electrolytic cell has the advantages of higher mass transfer rate, product purity and efficiency, and the development of highly efficient Stable electrocatalysts for acidic oxygen evolution reaction are particularly important
[0004]Ir materials are considered to be the best electrocatalysts for oxygen evolution reaction under acidic conditions. At present, relevant research work mainly focuses on Ir-based or Ir-oxidized nanostructured materials. However, most of these catalyst materials are synthesized by wet chemical method, and the surfactant adsorbed on the nanostructure is difficult to remove, which may affect the activity of the catalyst. The stability under these conditions is still poor and cannot meet the needs of industrial conditions. Therefore, the development of Ir-based acidic oxygen evolution reaction electrocatalysts with higher stability is still of great significance in the field of industrial acidic water electrolysis.

Method used

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  • Ultra-stable electrocatalyst material for efficient acidic oxygen evolution reaction and preparation method thereof
  • Ultra-stable electrocatalyst material for efficient acidic oxygen evolution reaction and preparation method thereof
  • Ultra-stable electrocatalyst material for efficient acidic oxygen evolution reaction and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] In this example, the nominal composition of the alloy we choose is W 60 Ir 20 B 20 , the preparation of the electrocatalyst material is as follows:

[0035] (1) Master alloy ingot preparation: according to the nominal composition W of the master alloy 60 Ir 20 B 20The alloy raw materials W, Ir and B (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 uniform alloy composition, the master alloy is placed in the furnace Repeated turning and smelting for four to ten times to obtain master alloy ingots.

[0036] (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 60 Ir 20 B 20 Electro...

Embodiment 2

[0044] In this example, the nominal composition of the alloy we choose is W 80 Ir 10 B 10 , the preparation of the electrocatalyst material is as follows:

[0045] (1) Master alloy ingot preparation: according to the nominal composition W of the master alloy 80 Ir 10 B 10 The alloy raw materials W, Ir and B (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 above 200A. In order to ensure the uniform composition of the alloy, the master alloy is repeated in the furnace Turn over and smelt more than four times to obtain a master alloy ingot.

[0046] (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 10 B 10 El...

Embodiment 3

[0050] In this example, the nominal composition of the alloy we choose is Mo 60 Ir 20 B 20 , the preparation of the electrocatalyst material is as follows:

[0051] (1) Master alloy ingot preparation: according to the nominal composition of the master alloy Mo 60 Ir 20 B 20 The alloy raw materials W, Ir and B (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 above 200A. In order to ensure the uniform composition of the alloy, the master alloy is repeated in the furnace Turn over and smelt more than four times to obtain a master alloy ingot.

[0052] (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 Mo with a diameter of 2mm 60 Ir 20 B 20 E...

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Abstract

The invention discloses an ultra-stable electrocatalyst material for an efficient acidic oxygen evolution reaction. The ultra-stable electrocatalyst material is a (W, Mo, Nb, Ta, Zr, Hf, Re, Os)-Ir-(B, P) bulk alloy material, and the specific composition of the alloy material is (W, Mo, Nb, Ta, Zr, Hf, Re, Os)x-Iry-(B, P) z, wherein x is greater than or equal to 60 and smaller than or equal to 80,y is greater than or equal to 10 and smaller than or equal to 20, z is greater than or equal to 0 and smaller than or equal to 20, and x, y and z represent the atomic percentages of elements. The invention also discloses a preparation method of the super-stable electrocatalyst material for the efficient acidic oxygen evolution reaction. The material has excellent acidic OER electrocatalytic activity and ultrahigh stability, and can be used as an anode of an industrial acidic water electrolysis hydrogen production device; and meanwhile, the preparation method is simple and easy to operate, andis beneficial to large-scale application of a PEM water electrolysis technology.

Description

technical field [0001] The invention relates to an electrocatalyst material and a preparation method thereof, belonging to the application field of electrocatalyst materials, in particular to an ultra-stable electrocatalyst material for high-efficiency acidic oxygen evolution reaction and a preparation method thereof. Background technique [0002] With the intensification of the world's energy crisis, the development of new energy is imminent, and electrocatalytic energy conversion technologies, such as electrocatalytic water splitting to produce hydrogen, electrocatalytic carbon dioxide reduction, and electrocatalytic nitrogen reduction, are an alternative to fossil energy, reducing carbon emissions, An important source of access to renewable fuels. Among them, the electrochemical oxygen evolution reaction is an important anodic half-reaction in these electrocatalytic energy conversion processes. However, the electrochemical oxygen evolution reaction is kinetically slow, a...

Claims

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Application Information

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IPC IPC(8): C25B11/046C25B1/04C22C27/04C22C27/02C22C16/00C22C27/00C22C5/04C22C28/00C22C1/03
CPCC25B11/04C25B1/04C22C27/04C22C27/02C22C16/00C22C27/00C22C5/04C22C1/03Y02E60/36
Inventor 李睿胡飞熊宇杰
Owner 新余市金通科技有限公司