Ternary CoAuPd catalyst for fuel cells and preparation method and application thereof

A fuel cell and catalyst technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of slow oxygen reduction reaction kinetics, large amount of noble metal Pt, and low catalyst stability, and achieve excellent catalytic oxidation of alcohols. Effects of oxygen reduction performance, improvement of catalytic performance, and ease of operation

Active Publication Date: 2018-09-21
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, Pt-based catalysts are still the mainstream catalysts for direct methanol fuel cells, but the precious metal Pt has a large amount of use, less reserves, high prices, and is easily poisoned by intermediate products, and there are also slow oxygen reduction reaction kinetics, low catalyst stability, and fuel penetration. And other issues

Method used

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  • Ternary CoAuPd catalyst for fuel cells and preparation method and application thereof
  • Ternary CoAuPd catalyst for fuel cells and preparation method and application thereof
  • Ternary CoAuPd catalyst for fuel cells and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Take 1.0g of triblock copolymer P123 and dissolve it in 50mL of double-distilled water with ultrasonic stirring; then add 20mL of 1.1mg / mL cobalt chloride solution, feed nitrogen to prevent Co oxidation and magnetically stir, the temperature is controlled at 30°C, Add 20 mL of sodium borohydride solution (5.0 mg / mL) dropwise at a rate of 5 s / drop into the mixed solution of P123 and cobalt chloride.

[0043] (2) After sodium borohydride has been added dropwise, after reacting for 30 minutes, add 20 mL of chloroauric acid (0.03mmol / L) and potassium chloropalladate (0.03mmol / L) dropwise at a speed of 5 s / drops in the reaction solution Mix the solution until the mixed solution turns black and a precipitate forms.

[0044] (3) After reacting for 4 hours, the obtained black suspension was centrifuged at 10000r / min, washed 3 times with double distilled water first, then 3 times with absolute ethanol, and finally the product after washing was added to anhydrous Ethanol dis...

Embodiment 2

[0053] (1) Take 1.0g of triblock copolymer P123 and dissolve it in 50mL of double-distilled water with ultrasonic stirring; then add 20mL of 1.1mg / mL cobalt chloride solution, feed nitrogen to prevent Co oxidation and magnetically stir, the temperature is controlled at 30°C, Add 20 mL of sodium borohydride solution (5.0 mg / mL) dropwise at a rate of 5 s / drop into the mixed solution of P123 and cobalt chloride.

[0054] (2) After sodium borohydride has been added dropwise, after reacting for 10 minutes, add 20 mL of chloroauric acid (0.03mmol / L) and potassium chloropalladate (0.03mmol / L) dropwise at a speed of 5 s / drops in the reaction solution Mix the solution until the mixed solution turns black and a precipitate forms.

[0055] (3) After reacting for 4 hours, the obtained black suspension was centrifuged at 10000r / min, washed 3 times with double distilled water first, then 3 times with absolute ethanol, and finally the product after washing was added to anhydrous Ethanol dis...

Embodiment 3

[0058] (1) Take 1.0g of triblock copolymer P123 and dissolve it in 50mL of double-distilled water with ultrasonic stirring; then add 20mL of 1.1mg / mL cobalt chloride solution, feed nitrogen to prevent Co oxidation and magnetically stir, the temperature is controlled at 30°C, Add 20 mL of sodium borohydride solution (10.0 mg / mL) dropwise at a rate of 5 s / drop into the mixed solution of P123 and cobalt chloride.

[0059] (2) After sodium borohydride has been added dropwise, after reacting for 50 minutes, add 20 mL of chloroauric acid (0.03mmol / L) and potassium chloropalladate (0.03mmol / L) dropwise at a speed of 5 s / drops in the reaction solution Mix the solution until the mixed solution turns black and a precipitate forms.

[0060] (3) After reacting for 4 hours, the obtained black suspension was centrifuged at 10000r / min, washed 3 times with double distilled water first, then 3 times with absolute ethanol, and finally the product after washing was added to anhydrous Ethanol di...

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Abstract

The invention relates to a preparation method and application of a fuel cell catalyst. Electrochemical dealloying is performed. The synthesis method adopts a continuous reduction method, and includesthe steps that a triblock copolymer P123 serves as a protecting agent, and sodium borohydride serves as a reducing agent; a certain amount of P123 is taken and dissolved in redistilled water, a cobaltchloride solution is added to the P123 solution, before reaction, nitrogen is introduced to remove oxygen, continuous stirring is performed, and the reaction temperature is controlled to be room temperature (30 DEG C); a sodium borohydride solution is slowly dropwise added to the reaction liquid, 30 minutes after dropwise adding, a mixed solution of chloroauric acid and potassium chloropalladateis slowly dropwise added to the reaction liquid, and the reaction is stopped after lasting 4 hours; the reaction liquid is centrifuged and washed three to five times to obtain the ternary CoAuPd alloycatalyst for fuel cells. The special ternary CoAuPd alloy catalyst has excellent methanol catalytic oxidation performance and oxygen reduction catalytic activity after electrochemical gradient dealloying and is a fuel cell catalyst with broad development prospects.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a catalyst preparation method and dealloying, in particular to a fuel cell catalyst CoAuPd preparation method and an electrochemical gradient dealloying method. Background technique [0002] The widespread use of traditional fossil energy such as oil, coal, and natural gas has not only exacerbated the energy crisis, but also has low energy conversion efficiency. During use, a large amount of toxic and harmful gases will be emitted, leading to environmental pollution, global warming, and smog. Fuel cells use flammable gases such as hydrogen, natural gas, and coal gas, and liquids such as methanol, ethanol, and formic acid as raw materials, and directly convert the chemical energy in the fuel into electrical energy through electrode reactions. Since the reaction process does not involve combustion, its energy conversion efficiency is low. Limited by the Carnot cycle, as high as 60...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9041Y02E60/50
Inventor 周新文罗来明陈迪胡青云张荣华
Owner CHINA THREE GORGES UNIV
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