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Crystal face modulated low-platinum alloy catalyst and preparation method and application thereof in fuel cell

A composite catalyst, platinum alloy technology, applied in battery electrodes, circuits, electrical components, etc., to achieve strong operability, promote large-scale commercial applications, and improve oxygen reduction electrocatalytic activity and durability.

Active Publication Date: 2021-08-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the prior art, there has never been any relevant research on improving the ORR catalytic performance and activity stability of platinum alloy catalysts by modifying the crystal planes.

Method used

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  • Crystal face modulated low-platinum alloy catalyst and preparation method and application thereof in fuel cell
  • Crystal face modulated low-platinum alloy catalyst and preparation method and application thereof in fuel cell
  • Crystal face modulated low-platinum alloy catalyst and preparation method and application thereof in fuel cell

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] When the reaction system is ethylene glycol and deionized water, a platinum-cobalt-tungsten alloy nanoparticle composite catalyst with preferred crystal plane orientation is prepared, and the steps are as follows:

[0037] (1) Take 14.2 mL of ethylene glycol and 23.7 mL of deionized water, take a certain amount of commercial carbon black powder and add it to the above solution, ultrasonicate for 60 min, add 9.3 mL of 0.01 M chloroplatinic acid ethylene glycol solution and 0.31 mL of 0.1 M cobalt chloride ethylene glycol solution and 1 mL of DMF solution with a concentration of 2.8 mM tungsten hexacarbonyl, and adjust the pH of the solution to 10 with NaOH solution to obtain a suspension;

[0038] (2) Put the suspension obtained in step (1) into a reaction kettle, place it in a vacuum drying oven at 200°C for reduction reaction, and react at this temperature for 3 h. After the reaction was finished, black slurry was obtained;

[0039] (3) Suction filter the black slurry...

Embodiment 2

[0042] Preparation of Platinum-Cobalt-Wungsten Alloy Nanoparticle Composite Catalysts with Preferential Orientation of Crystal Faces When the Reaction System Is Ethylene Glycol and Deionized Water

[0043] (1) Take 14.2 mL of ethylene glycol and 23.7 mL of deionized water, take a certain amount of commercial carbon black powder and add it to the above solution, sonicate for 30 minutes, add 9.3 mL of 0.01 M chloroplatinic acid in ethylene glycol solution and 0.31 mL of 0.1 M cobalt chloride in ethylene glycol and 8 mL of 2.8 mM tungsten hexacarbonyl in DMF. And adjust the pH of the solution to 8 with NaOH solution to obtain a suspension;

[0044] (2) Put the suspension obtained in step (1) into a reaction kettle, place it in a vacuum drying oven at 160°C for reduction reaction, and react at this temperature for 5 h. After the reaction was finished, black slurry was obtained;

[0045] (3) Suction filter the black slurry obtained in step (2), wash with deionized water, and dry ...

Embodiment 3

[0048] When the reaction system is ethylene glycol and deionized water, a platinum-cobalt-molybdenum alloy nanoparticle composite catalyst with preferred crystal plane orientation is prepared, and the steps are as follows:

[0049] (1) Take 14.2 mL of ethylene glycol and 23.7 mL of deionized water, take a certain amount of commercial carbon black powder and add it to the above solution, ultrasonicate for 60 min, add 9.3 mL of 0.01 M chloroplatinic acid ethylene glycol solution and 0.31 mL of 0.1 M cobalt chloride ethylene glycol solution and 1 mL of DMF solution with a concentration of 2.8 mM molybdenum hexacarbonyl, and adjust the pH of the solution to 10 with NaOH solution to obtain a suspension;

[0050] (2) Put the suspension obtained in step (1) into a reaction kettle, place it in a vacuum drying oven at 210°C for reduction reaction, and react at this temperature for 3 h. After the reaction was finished, black slurry was obtained;

[0051] (3) Suction filter the black sl...

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Abstract

The invention relates to a crystal face modulated low-platinum alloy catalyst and a preparation method and application thereof in a fuel cell. According to the preparation method, a specific transition metal carbonyl compound is adopted as a modifier and a stabilizer for alloy catalyst crystal face modulation, and a gas-liquid two-phase coexisting synthesis system generated in a critical state of an ethylene glycol reaction liquid in a reaction kettle is utilized to prepare a low-platinum alloy catalyst with high (111) crystal face preferred orientation, wherein the prepared commercial carbon black loaded alloy nanoparticle composite catalyst is black powder, the size of alloy particles is 1-5 nm, the alloy particles are uniformly dispersed on the surface of the carbon carrier, and the texture coefficient of preferred orientation of a crystal face of the modulated alloy reaches more than 1.24. The preparation method is simple and easy to implement, high in operability and suitable for industrial production. The catalyst has very high electrocatalytic activity and stability on oxygen reduction reaction in an acid medium, and the performance of the catalyst is superior to that of a commercial platinum-carbon (Pt / C) catalyst. The catalyst can be applied to a proton membrane fuel cell to replace a conventional commercial platinum-carbon catalyst.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a low-platinum alloy catalyst modulated by a crystal plane, a preparation method thereof and an application in a fuel cell. Background technique [0002] In recent years, proton exchange membrane fuel cells (PEMFCs) using hydrogen as fuel have attracted extensive attention as a clean and sustainable energy conversion device. This new type of energy conversion device has high energy conversion efficiency, can be widely used in new energy vehicles, aerospace, ships and other large equipment, and can effectively alleviate the excessive use of traditional fossil energy and the increasingly serious pollution caused by it. question. However, the large-scale commercial application of fuel cells is limited by the very slow kinetics of the cathode oxygen reduction reaction (ORR), so efficient catalysts are needed to lower the reaction energy barrier and accelerate the reaction. ...

Claims

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Application Information

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IPC IPC(8): H01M4/92
CPCH01M4/921H01M4/926H01M2004/8684Y02E60/50
Inventor 刘景军金纯娄益玮王峰
Owner BEIJING UNIV OF CHEM TECH
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