Fuel cell alloy catalyst preparation method

A technology for alloy catalysts and fuel cells, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. Increased resistance and other problems, to achieve the effects of large-scale production, improved stability, and improved catalytic activity

Inactive Publication Date: 2016-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the catalyst has not undergone any treatment after the thermal reduction treatment, in view of the acidic environment of the proton exchange membrane fuel cell, the transition metal Co in the Pt-Co alloy catalyst will dissolve during the operation of the battery, and the H on the Nafion membrane will dissolve. + The exchange occurs, which reduces the ability of the membrane to conduct protons, increases the membrane resistance, and ultimately leads to a decrease in battery performance

Method used

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  • Fuel cell alloy catalyst preparation method
  • Fuel cell alloy catalyst preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Add 10mL of deionized water to the beaker, then add 0.228gNi(NO 3 ) 2 ·6H 2 O or 0.226gCo(NO 3 ) 2 ·6H 2 O was added to the beaker and stirred evenly.

[0040] 2. Add 0.1g of 50wt% Pt / C to the above solution, and ultrasonicate for 30min until uniform.

[0041] 3. Add ammonia water diluted at a volume ratio of 1:4 to the above solution, adjust the pH=9, stir at room temperature for 3 hours, then centrifuge the above mixture, and finally dry it under vacuum at 60°C.

[0042] 4. The catalyst prepared above was heated at 800°C, 5% H 2 / Ar atmosphere thermal reduction treatment for 1 h, and then naturally cooled to room temperature.

[0043] 5. Mix the catalyst obtained in step 4 with 30mL, 1mol / L of H 2 SO 4 The solutions were mixed, sonicated for 30min, and then stirred in an oil bath at 80°C for 24h. Then it was centrifuged, washed several times, and finally dried under vacuum at 60°C.

[0044] The cyclic voltammetry and oxygen reduction polarization curves ...

Embodiment 2

[0046] 1. Add 15mL of deionized water to the beaker, then add 0.193gNi(NO 3 ) 2 ·6H 2 O was added to the beaker and stirred evenly.

[0047] 2. Add 0.1g of 50wt% Pt to the above solution 3 Pd / C, sonicate for 30min until uniform.

[0048] 3. Add ammonia water diluted at a volume ratio of 1:4 to the above solution, adjust the pH to 12, stir at room temperature for 1 hour, then centrifuge the above mixture, and finally dry it under vacuum at 60°C.

[0049] 4. The catalyst prepared above was heated at 900°C under H 2 Thermal reduction treatment under atmosphere for 0.5h, then naturally cooled to room temperature.

[0050] 5. Mix the catalyst obtained in step 4 with 40 mL, 0.5 mol / L of H 2 SO 4 The solutions were mixed, sonicated for 30min, and then stirred in an oil bath at 60°C for 48h. Then it was centrifuged, washed several times, and finally dried under vacuum at 60°C.

[0051] The activity of the catalyst that present embodiment makes and stability test curve are as ...

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Abstract

The present invention provides a fuel cell alloy catalyst preparation method, which specifically comprises: adopting a platinum-based catalyst as a substrate, depositing a transition metal hydroxide on the surface, carrying out a heat treatment in a reducing atmosphere to obtain a platinum-based-transition metal / charcoal alloy catalyst, and carrying out acid washing on the obtained alloy catalyst in an acidic solution to remove the transition metal on the surface so as to obtain the product. According to the present invention, the alloy catalyst obtained by using the preparation method provides high unit mass Pt catalysis activity for the oxygen reduction, and the stability is substantially improved relative to the substrate platinum-based catalyst; and the method is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a preparation method of a fuel cell alloy catalyst. Background technique [0002] Proton exchange membrane fuel cells using hydrogen as fuel have the advantages of high power density, fast start-up at room temperature, cleanliness, and high efficiency, and are considered to be an ideal next-generation power generation device. Due to its broad application prospects in the fields of fixed power stations, transportation and portable power supplies, it has attracted great attention from governments, major companies and scientific researchers. However, the commercial application of proton exchange membrane fuel cells is facing two major problems of cost and life. The specific gravity has reached 46%. This is because Pt is mainly used as a catalyst in the current proton exchange membrane fuel cell, and the resource of Pt is limited, so the price is expensive; Dissolution and agg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89H01M4/92
CPCY02E60/50
Inventor 秦晓平邵志刚谢峰曹龙生唐雪君
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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