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Intermetallic compound catalyst and preparation method thereof

A technology of intermetallic compounds and intermetallic alloys, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve low efficiency, uneven catalyst particle size, Problems such as catalyst particle agglomeration

Pending Publication Date: 2022-06-28
HYUNDAI MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the process flow of the preparation of intermetallic alloys, high temperature annealing process is essential, during which agglomeration of metal particles occurs
Traditionally, inorganic materials or carbon coatings have been introduced to control particle size, but this approach is less efficient in terms of economy and resource recovery
[0008] In addition, when using commercially available carbon supports to prepare intermetallic alloy catalysts, the size of the intermetallic catalyst particles is not uniform, and the catalyst particles may agglomerate during the synthesis process.

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
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Effect test

Embodiment 1

[0105] Prepared with an average pore size of 7nm and a specific surface area of ​​1000m 2 / g of carbon support (product name: KB300J, manufacturer: Lion).

[0106] Put Pt(acac) 2 , Fe(acac) 3 and carbon support were added to ethylene glycol to prepare a solution of the precursor mixture, using a tip type ultrasonic wave (Sonic and Materials, model VC-500, amplitude 30%, 13 mm solid probe, 20 kHz) under an argon atmosphere at 100 mL of the precursor mixture solution was irradiated with ultrasonic waves at an output of 150 W for 3 hours to form alloy particles in the pores of the carbon support.

[0107] 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 and the transition metal can be 2:3.

[0108] The prepared alloy particles were annealed at a temperature of 800° C. for 2 hours in an atmosphere of 4% hydrogen and 96% air, thereby forming intermetallic alloy particles. Th...

Embodiment 2

[0110] The intermetallic compound catalyst was prepared according to the same method as in Example 1, except that the carbon support used was prepared by annealing the carbon support of Example 1 at a temperature of 1500° C. for 2 hours, and had an average of 10 nm. Aperture and 600m 2 / g specific surface area.

Embodiment 3

[0112] The intermetallic compound catalyst was prepared according to the same method as in Example 1, except that the carbon support used was prepared by annealing the carbon support of Example 1 at a temperature of 2000° C. for 2 hours, and had an average of 13 nm. Aperture and 300m 2 / g specific surface area.

[0113] Evaluation method: Evaluation of fuel cell performance of intermetallic compound catalysts Each prepared intermetallic compound catalyst (40% by weight) was dispersed in n-propanol solvent at an ionomer to carbon ratio (I / C) of 0.6 to prepare slurry.

[0114] The slurries were respectively coated on release paper to make cathode and anode (cathode: Pt loading was 0.1 mg / cm 2 , anode: Pt loading is 0.025mg / cm 2 ) and insert a Nafion membrane between the cathode and anode to make a membrane electrode assembly (MEA).

[0115] The fabricated MEA was connected to an apparatus for evaluating fuel cells, and then heated at a temperature of 65 °C, a bar pressure of...

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Abstract

The present invention provides an intermetallic compound catalyst and a method for preparing the same, the method comprising: applying ultrasonic waves to a precursor mixture solution comprising a noble metal precursor, a transition metal precursor, and a carbon support having an average pore diameter of about 6 nm to about 15 nm and a specific surface area of about 200 m2 / g to about 2000 m2 / g, thereby forming alloy particles in pores of the carbon support; and annealing the alloy particles in the pores of the carbon support to form intermetallic alloy particles.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2020-0182779 filed in the Korean Intellectual Property Office on December 24, 2020, 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. Fuel cells have higher efficiency compared to existing internal combustion engines 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 cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/92B01J35/00
CPCH01M4/8825H01M4/9041H01M4/9083H01M4/921H01M4/926Y02P70/50B01J37/08B01J37/0221B01J37/343B01J23/89B01J35/61B01J35/64B01J35/40
Inventor 黄智娟李恩直郭多喜张志勋吴松诒
Owner HYUNDAI MOTOR CO LTD
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