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Intermetallic compound catalyst and preparation method thereof

An intermetallic compound and catalyst technology, applied in the field of intermetallic compound catalysts and their preparation, can solve the problems of reduced durability and catalytic activity, easy melting, performance and durability reduction, etc., and achieve the effect of improving catalyst performance and durability.

Pending Publication Date: 2022-07-19
HYUNDAI MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the alloy catalyst prepared by the above method has the following problems: a large amount of transition metals exist on the surface of the particles without forming an alloy, and these transition metals tend to melt during fuel cell operation, thereby reducing durability and catalytic activity
[0009] Therefore, in order to prepare alloy catalysts satisfying high catalytic activity and durability for use as fuel cell catalysts, it is necessary to solve the problem of performance and durability degradation caused by leached metal components and coarsened particles

Method used

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  • Intermetallic compound catalyst and preparation method thereof
  • Intermetallic compound catalyst and preparation method thereof
  • Intermetallic compound catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0075] The method of preparing the intermetallic compound catalyst 30 according to the embodiment provides the core-shell particles 20 including the transition metal oxide coating 150 in one process using ultrasonication, so that the process can be simplified to save costs.

[0076] The core-shell particles 20 are then annealed to provide intermetallic particles including the transition metal oxide coating 150 (S2).

[0077] The atoms of the noble metal and the transition metal are regularly arranged by the annealing process, and the ratio of the transition metal core 110 is decreased, thereby preparing the intermetallic compound particles 130 . The intermetallic compound particles are alloys of noble metals and transition metals, which are intermetallic compound alloys in which noble metal atoms and transition metal atoms are regularly arranged.

[0078] Since the transition metal oxide coating 150 inhibits particle growth, the size of the intermetallic compound particles 130...

Embodiment

[0099] Hereinafter, specific embodiments of the present invention are described. However, the examples described below are for illustrative purposes only, and the scope of the present invention is not limited thereto.

[0100] Preparation Example: Preparation of Intermetallic Compound Catalyst

[0101] Example

[0102] Put Pt(acac) 2 , Fe(acac) 3 and porous carbon support (Vulcan XC72) were added to ethylene glycol to prepare a solution of the precursor mixture, and then 100 mL of the precursor mixture was sonicated using a Tip-type ultrasonic wave (Sonic & Materials, model VC-500, 30% amplitude, 13 mm solid probe, 20 kHz). The solution was subjected to ultrasonic irradiation at an output of 150 W under an argon atmosphere for 3 hours to provide core-shell particles comprising transition metal oxide coatings.

[0103] At this time, the addition amount of the noble metal precursor and the transition metal precursor is adjusted so that the atomic ratio of the noble metal a...

experiment example 1

[0109] Experimental Example 1: XRD analysis according to the annealing temperature of the intermetallic compound catalyst prepared in the comparative example

[0110] In-situ XRD analysis was performed on the intermetallic compound catalyst prepared in the comparative example, and the results are shown in figure 2 middle. In addition, the degree of atomic arrangement order of the intermetallic compound catalysts prepared in Examples and Comparative Examples was measured, and the results are shown in image 3 middle. Figure 4 The phase transition diagram of the intermetallic compound catalyst prepared in the comparative example is shown.

[0111] In the case of the comparative example, since the annealing gas directly transfers heat in the method of producing intermetallic compound particles without introducing a coating layer for particle size control, the effective heat transfer rate is very fast compared to the examples.

[0112] as in figure 2 As shown in the XRD pat...

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Abstract

The invention provides an intermetallic compound catalyst and a preparation method thereof. The method includes: forming core-shell particles including a transition metal oxide coating layer by irradiating a precursor mixture solution including a noble metal precursor, a transition metal precursor, and a support with ultrasonic waves; forming intermetallic compound particles including a transition metal oxide coating layer by annealing the core-shell particles; and removing the transition metal oxide coating from the intermetallic compound particles.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2021-0005700, filed with the Korean Intellectual Property Office on Jan. 15, 2021, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to an intermetallic compound catalyst for fuel cells and a preparation method thereof. Background technique [0004] A fuel cell is an energy conversion device that directly converts the chemical energy of fuel into electrical energy. Compared with existing internal combustion engines, fuel cells have higher efficiency and have attracted much attention as a next-generation energy source due to their high energy density and environmental friendliness. [0005] Polyelectrolyte fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs) mainly operate at low temperatures of less than or equal to about 80 °C, thus requiring electrode ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92B22F1/142B22F1/16B22F1/17B22F9/24B82Y40/00B01J35/00
CPCH01M4/88H01M4/921H01M4/926B22F9/24B82Y40/00Y02E60/50H01M4/9041B01J37/08B01J37/0221B01J37/343B01J23/89B01J35/397B01J35/40
Inventor 吴松诒黄智娟郭多喜张志勋李恩直
Owner HYUNDAI MOTOR CO LTD
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