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Intermetallic compound catalyst and method for preparing intermetallic compound catalyst by using bimetallic complex

An intermetallic compound, bimetallic complex technology, applied in the field of nanomaterials, can solve the problems of lack of ordered platinum-based alloy nanoparticle size and composition uniformity, decrease of catalyst electrochemically active surface area, and unsuitable for large-scale preparation, etc. To achieve the effect of universality, controllable composition, and high degree of atomic alloying

Active Publication Date: 2021-09-17
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid-phase synthesis is only suitable for some alloy systems with low boiling points, and additional surfactants and reducing agents need to be added during the synthesis, the operation is complicated and not suitable for large-scale preparation; while in the general thermal annealing method, the impregnation method is first used to combine two different The metal precursors are impregnated directly on the carbon support. Although the method is simple, it lacks the control of the uniformity of the size and composition of the ordered Pt-based alloy nanoparticles.
Especially when the metal loading increases, there is a strong affinity between metal atoms, and the particles are easy to agglomerate, which eventually leads to a decrease in the electrochemically active surface area of ​​the catalyst.
Therefore, there are few reports on the synthesis of ordered platinum-based intermetallic compound fuel cell catalysts with acceptable size, controllable composition and high noble metal platinum loading.

Method used

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  • Intermetallic compound catalyst and method for preparing intermetallic compound catalyst by using bimetallic complex
  • Intermetallic compound catalyst and method for preparing intermetallic compound catalyst by using bimetallic complex
  • Intermetallic compound catalyst and method for preparing intermetallic compound catalyst by using bimetallic complex

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Experimental program
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Effect test

Embodiment 1

[0044] a. Disperse 68 μL of thioacetic acid solution into 30 ml of water, then add 85 mg of sodium bicarbonate solution dissolved in 3 ml of water, stir at room temperature for 5 minutes, then add 100 mg of potassium chloroplatinite solution dissolved in 3 ml of water and Dissolve 57mg of cobalt chloride hexahydrate solution in 3ml of water, and continue to stir at room temperature for 24h to obtain a gray precipitate containing a platinum-cobalt double metal complex;

[0045] b. Suction filter and wash the above-mentioned aqueous solution containing the molecules of the platinum-cobalt double metal complex, repeat three times, and then put it into a vacuum drying oven at 65° C. for 6 hours;

[0046]c. Take 28 mg of the above-mentioned completely dried bimetallic complex molecules and 20 mg of carbon black XC-72 and dissolve them in a mixed solvent of 10 ml of tert-butanol and 12 ml of water, and then ultrasonicate for 1 hour in an ultrasonic machine, and transfer the obtained ...

Embodiment 2

[0051] a. Disperse 68 μL of thioacetic acid solution into 30 ml of water, then add 85 mg of sodium bicarbonate solution dissolved in 3 ml of water, stir at room temperature for 5 minutes, then add 100 mg of potassium chloroplatinite solution dissolved in 3 ml of water and Dissolve 57mg of cobalt chloride hexahydrate solution in 3ml of water, and continue to stir at room temperature for 24h to obtain a gray precipitate containing a platinum-cobalt double metal complex;

[0052] b. Suction filter and wash the above-mentioned aqueous solution containing the molecules of the platinum-cobalt double metal complex, repeat three times, and then put it into a vacuum drying oven at 65° C. for 6 hours;

[0053] c. Dissolve 47.4mg of the above-mentioned completely dried bimetallic complex molecules and 20mg of carbon black KJ300 into a mixed solvent of 10ml of tert-butanol and 12ml of water, and then ultrasonicate for 1 hour in an ultrasonic machine, and transfer the obtained homogeneous m...

Embodiment 3

[0058] a. Disperse 68 μL of thioacetic acid solution into 30 ml of water, then add 85 mg of sodium bicarbonate solution dissolved in 3 ml of water, stir at room temperature for 5 minutes, then add 100 mg of potassium chloroplatinite solution dissolved in 3 ml of water and Dissolve 67 mg of ferrous sulfate heptahydrate solution in 3 ml of water, and continue to stir at room temperature for 24 hours to obtain a precipitate containing a platinum-iron double metal complex;

[0059] b. Suction filter and wash the aqueous solution of the molecule containing the platinum-iron double metal complex, repeat three times, and then put it into a vacuum drying oven at 65°C for 6 hours;

[0060] c. Dissolve 27.6mg of the above-mentioned fully dried bimetallic complex molecules and 20mg of carbon black XC-72 into a mixed solvent of 10ml of tert-butanol and 12ml of water, and then ultrasonicate for 1h in an ultrasonic machine, and transfer the obtained homogeneous mixture to In a centrifuge tu...

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Abstract

The invention provides a method for preparing an intermetallic compound catalyst by using a bimetallic complex. The method comprises the following steps: S1) mixing thioacetic acid, sodium bicarbonate, potassium chloroplatinite and a transition metal salt in an aqueous solution to obtain bimetallic complex molecules separated out in a precipitate form; s2) carrying out moisture removal treatment on the bimetallic complex molecules; s3) mixing the dewatered bimetallic complex molecules with carbon black in a mixed solvent of tert-butyl alcohol and water, and freeze-drying to obtain a mixture of the bimetallic complex molecules and the carbon black; and S4) calcining the mixture in a reducing atmosphere to obtain the intermetallic compound catalyst. The intermetallic compound catalyst prepared by using a freeze drying method can form high-loading platinum load at a low annealing temperature, the atomic ratio of platinum to transition metal is clear 1: 1, the composition is controllable, the size distribution is uniform, and the atomic alloying degree is high. The method is simple to operate, has universality and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to an intermetallic compound catalyst and a method for preparing the intermetallic compound catalyst by using a double metal complex. Background technique [0002] In the past three decades, proton exchange membrane fuel cells have developed rapidly as a power source for electric vehicles, and understanding the basic principles of related electrocatalytic processes can provide us with ideas for designing efficient and stable proton exchange membrane fuel cell catalysts. At present, Pt is still a precious metal single substance catalyst that is difficult to replace in proton exchange membrane fuel cell catalysts. In the process of designing high-efficiency platinum-based proton exchange membrane fuel cells, the loading of high-load platinum on the cathode catalyst is very important, which is Since the extreme loss of power density is observed in proton exchange membrane f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/60B01J37/03B01J37/08B01J37/18B01J37/32
CPCB01J23/8913B01J23/8906B01J23/892B01J23/60B01J37/031B01J37/32B01J37/08B01J37/18B01J35/393B01J35/23Y02E60/50
Inventor 梁海伟李帅童磊
Owner UNIV OF SCI & TECH OF CHINA
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