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Preparation method of carbon material loaded high-entropy alloy oxygen reduction electrocatalyst

A technology of electrocatalysts and high-entropy alloys, applied in circuits, electrical components, battery electrodes, etc., can solve the problems that the calcination time is not conducive to the large-scale preparation of electrocatalysts, weak oxygen reduction performance, etc., to achieve thermal migration inhibition, good dispersion, Universal effect

Pending Publication Date: 2022-02-25
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxygen reduction half-wave potential of the high-entropy alloy electrocatalyst is only 0.83V, and the oxygen reduction performance is weak.
The calcination reduction process of this method is as long as 10 hours, and too long calcination time is not conducive to the mass preparation of electrocatalysts

Method used

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  • Preparation method of carbon material loaded high-entropy alloy oxygen reduction electrocatalyst
  • Preparation method of carbon material loaded high-entropy alloy oxygen reduction electrocatalyst
  • Preparation method of carbon material loaded high-entropy alloy oxygen reduction electrocatalyst

Examples

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Embodiment 1

[0023] A method for preparing a carbon material-supported multi-element alloy oxygen reduction electrocatalyst, comprising the following steps:

[0024] (1) in 60ml 0.5M H 2 SO 4 Add 80 mg of commercial platinum carbon and 78.43 μl of aniline monomer to the solution, mix ultrasonically for 30 minutes and then stir at room temperature for 2 hours. Under ice bath conditions, 164.48 mg of ammonium persulfate is used as an initiator to in-situ polymerize aniline on the surface of commercial platinum carbon ; Washing and drying are then carried out to obtain commercial platinum carbon coated with polyaniline on the surface;

[0025] (2) Add 50 ml of commercial platinum carbon coated with polyaniline to an ethanol solution containing nickel acetylacetonate, cobalt acetylacetonate, manganese acetylacetonate and cerium acetylacetonate in equimolar ratio, ultrasonically mix for 30 minutes and then stir at room temperature for 2 hours, Drying by rotary evaporator to obtain commercial ...

Embodiment 2

[0033] On the basis of Example 1, different from Example 1, in step (1): add 40 mg of commercial platinum carbon and 120 mg of dopamine hydrochloride in 40 ml of oxygen-saturated Tris-HCl buffer solution, under oxygen-saturated conditions, room temperature After stirring for 1 hour, dopamine hydrochloride is in-situ polymerized on the surface of commercial platinum carbon; in step (3): heating to 700° C. at a heating rate of 5° C. / min and then keeping it for 1 hour. A PtNiCoMnCe high-entropy alloy similar to Example 1 can be obtained.

Embodiment 3

[0035] On the basis of Example 1, different from Example 1, in step (1): in 100ml aqueous solution, add 1g of sodium dodecylbenzenesulfonate as a dispersant, then add 80mg of commercial platinum carbon and 50μl of pyrrole mono body, ultrasonically mixed for 30 minutes and then stirred at room temperature for 2 hours. Under ice bath conditions, 0.2M ferric chloride was used as an initiator to polymerize pyrrole on the surface of commercial platinum carbon in situ; in step (3): at 5°C / min The heating rate was heated to 700 °C and then kept for 1 h.

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Abstract

The invention discloses a preparation method of a carbon material loaded high-entropy alloy oxygen reduction electrocatalyst, which comprises the following steps of forming a coating layer for adsorbing metal ions on the surface of platinum carbon, and then dipping in a metal salt solution, wherein a metal source of the metal salt solution at least comprises four metal elements, and calcining the impregnated platinum carbon, melting metal ions into platinum nano-particles through thermal diffusion so as to form a high-entropy alloy, and then performing acid pickling and drying, thereby obtaining the electrocatalyst. According to the preparation method, platinum and carbon are used for high-entropy alloying, the subsequent carrier loading process is avoided, platinum is anchored to the surface of the carrier, moderate dispersity is achieved, thermal migration of platinum in the high-temperature calcination reduction process can be restrained, and alloy particles can keep small size and good dispersity; alloy types are not limited, and the universality is high; the half-wave potential of the prepared PtNiCoMnCe high-entropy alloy is 0.938 V which is superior to 49 mV of commercial platinum carbon, and the oxygen reduction performance is good.

Description

technical field [0001] The invention relates to a preparation method of a composite material electrocatalyst, in particular to a preparation method of a high-entropy alloy oxygen reduction electrocatalyst supported by a carbon material. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) have emerged as a means to efficiently utilize hydrogen energy due to their high energy conversion efficiency, low operating temperature, and sustainable power generation. However, the development of proton exchange membrane fuel cells has been inhibited due to insufficient activity, poor stability, and high cost of cathode Pt catalysts. [0003] Multi-element alloys can adjust the electronic structure of the active center of the electrocatalyst, improve the catalytic activity of the unit active site of the electrocatalyst, thereby significantly improving the catalytic activity of the electrocatalyst, and the introduction of low-cost alloy elements can reduce the overa...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/921H01M4/926H01M4/88Y02E60/50
Inventor 刘建国华康李佳张天任曹寅亮王胜平张树国徐淳川赵海敏
Owner NANJING UNIV
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