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Preparation method and application of boron-nitrogen modified metal electrocatalyst for improving oxygen reduction durability

An electrocatalyst and durability technology, applied in circuits, electrical components, battery electrodes, etc., can solve problems affecting the electrocatalytic activity of metals and the conductivity of precious metals, and achieve good performance and long-term stability

Pending Publication Date: 2022-06-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hexagonal boron nitride is an insulator and does not conduct electricity. If it is coated on a noble metal catalyst, it will affect the conductivity of the noble metal and ultimately affect the electrocatalytic activity of the metal.

Method used

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  • Preparation method and application of boron-nitrogen modified metal electrocatalyst for improving oxygen reduction durability
  • Preparation method and application of boron-nitrogen modified metal electrocatalyst for improving oxygen reduction durability
  • Preparation method and application of boron-nitrogen modified metal electrocatalyst for improving oxygen reduction durability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Take 50 mg of a precious metal electrocatalyst (37 wt% commercial platinum carbon, manufacturer: Johnson Matthey), add 100 mL of deionized water, and stir to obtain a black slurry.

[0037] 2) Add 25mg of NH 3 -BH 3 (CAS number: 13774-81-7, Aladdin) in the solution, let stand for 12h, when the bubbles disappear completely, ultrasonicate for 15min, place it in a constant temperature water bath at 60°C for 12h with magnetic stirring, and then place it in a blast drying oven for 60 Dry at ℃ for 12h to obtain a mixture of white powder and black powder.

[0038] 3) The mixture is carbonized in a tube furnace with argon. The carbonization program is: from room temperature to 500 °C at a heating rate of 5 °C / min, holding for 2 hours, then cooling to room temperature with the furnace, taking out, using agate Grinding in a mortar for 1 min, no washing, no drying, recorded as BN-PtM / C-2 (m is PtM / C and NH 3 -BH 3 mass ratio).

Embodiment 2

[0041] 1) Take 50 mg of a precious metal electrocatalyst (37 wt% commercial platinum carbon, manufacturer: Johnson Matthey), add 100 mL of deionized water, and stir to obtain a black slurry.

[0042] 2) Add 50mg of NH 3 -BH 3 (CAS number: 13774-81-7, Aladdin) in the solution, let stand for 12h, when the bubbles disappear completely, ultrasonicate for 15min, place it in a constant temperature water bath at 60°C for 12h with magnetic stirring, and then place it in a blast drying oven for 60 Dry at ℃ for 12h to obtain a mixture of white powder and black powder.

[0043] 3) The mixture is carbonized in a tube furnace with argon. The carbonization program is: from room temperature to 500 °C at a heating rate of 5 °C / min, holding for 2 hours, then cooling to room temperature with the furnace, taking out, using agate Grind in a mortar for 1 min without washing or drying, denoted as BN-PtM / C-1.

Embodiment 3

[0045] 1) Take 50 mg of a precious metal electrocatalyst (37 wt% commercial platinum carbon, manufacturer: Johnson Matthey), add 100 mL of deionized water, and stir to obtain a black slurry.

[0046] 2) Add 75mg of NH 3 -BH 3 (CAS number: 13774-81-7, Aladdin) in the solution, let stand for 12h, when the bubbles disappear completely, ultrasonicate for 15min, place it in a constant temperature water bath at 60°C for 12h with magnetic stirring, and then place it in a blast drying oven for 60 Dry at ℃ for 12h to obtain a mixture of white powder and black powder.

[0047] 3) The mixture is carbonized in a tube furnace with argon. The carbonization program is: from room temperature to 500 °C at a heating rate of 5 °C / min, holding for 2 hours, then cooling to room temperature with the furnace, taking out, using agate Grind in a mortar for 1 min without washing or drying, denoted as BN-PtM / C-2 / 3.

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Abstract

The invention relates to a preparation method and application of a boron-nitrogen modified metal electrocatalyst for improving oxygen reduction durability, and belongs to the field of fuel cell electrocatalyst materials. The preparation method comprises the following steps: dispersing a noble metal electrocatalyst in a solvent, uniformly stirring to obtain a black solution, adding NH3-BH3 into the solution, and drying after bubbles completely disappear to obtain a mixture of white powder and black powder; and carbonizing the mixture under an argon condition to obtain the product. The preparation method of the boron-nitrogen modified noble metal electrocatalyst has the advantages of simple operation, fewer processes, less equipment investment and good repeatability, is convenient for solving the problem of difficulty in large-scale production, and can also provide a new protection strategy for other types of electrocatalysts and carriers of the electrocatalysts.

Description

technical field [0001] The invention relates to a preparation method and application of a boron-nitrogen modified metal electrocatalyst for improving oxygen reduction durability, and belongs to the field of fuel cell electrocatalyst materials. Background technique [0002] Since the industrial revolution, the demand for fossil energy is affecting the production and life of human beings, and some new energy sources have emerged, such as fuel cells, metal-air batteries, etc. Oxygen reduction reaction plays a very important role in these new energy devices. Currently, noble metal catalysts are considered to be the best oxygen reduction electrocatalysts for fuel cells, but their scarcity of reserves, high recovery costs, and poor durability have hindered their large-scale commercial applications. Especially in terms of durability, the ability to maintain high stability of noble metal catalysis is an urgent need for commercial electrocatalysts. Therefore, it is imperative to ra...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/921H01M4/88
Inventor 宋玉江邱忠瑜高蕊
Owner DALIAN UNIV OF TECH
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