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Preparation method of direct methanol fuel cell anode composite membrane catalyst

A methanol fuel cell and composite membrane technology, which is applied in catalyst activation/preparation, battery electrodes, chemical instruments and methods, etc., can solve the problems of easy agglomeration, restrict the application of graphene, etc., and achieves simple preparation method, electrocatalytic activity and resistance. The effect of improving CO poisoning ability and reducing cost

Active Publication Date: 2012-09-12
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene is easy to agglomerate in water and common organic solvents. At present, graphene is used to modify electrode materials using more direct mixing methods, coating methods, etc., such as Chinese patents CN 101733094 A, CN101745384 A, CN 101814607 A It is reported that using graphene as a carrier to directly support platinum nanoparticles to prepare platinum / graphene electrocatalysts shows catalytic activity for methanol, but this direct loading method also limits the further application of graphene.

Method used

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  • Preparation method of direct methanol fuel cell anode composite membrane catalyst
  • Preparation method of direct methanol fuel cell anode composite membrane catalyst
  • Preparation method of direct methanol fuel cell anode composite membrane catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Glassy carbon electrode substrate pretreatment:

[0029] The glassy carbon electrode substrate was first coated with 1.0, 0.3 and 0.05 μm α-Al 2 o 3 powder polishing, followed by ultrasonic cleaning in ethanol solution and distilled water for 10 min, at 0.5 mol L -1 h 2 SO 4 Control the potential range in the solution from -0.25V to 1.25V to carry out cyclic potential scanning until a stable standard cyclic voltammogram is obtained.

[0030] 2. Preparation of PEI functionalized modified graphene

[0031] Dissolve 0.05g of graphite oxide in 100mL of deionized water, form a uniform dispersion after ultrasonication for 30min, add 0.8g of PEI, reflux at 60°C for 12h under stirring conditions, cool to room temperature, add 2 drops of hydrazine hydrate and vigorously stir for 5min, and stir at 96°C under stirring conditions Reflux for 12 hours, centrifuge to separate the precipitate, wash with deionized water until neutral to obtain PEI functionalized graphene, the pr...

Embodiment 2

[0041] 1. Glassy carbon electrode substrate pretreatment:

[0042] The pretreatment method of the glassy carbon electrode substrate is the same as in Example 1.

[0043] 2. Preparation of PDDA functionalized graphene

[0044] Dissolve 0.10g of graphite oxide in 200mL of deionized water, form a uniform dispersion after ultrasonication for 40min, add 3.0g of PDDA, reflux at 80°C for 12h under stirring conditions, cool to room temperature, add 2 drops of hydrazine hydrate, stir vigorously for 5min, and reflux at 110°C under stirring conditions After 24 hours, a water-soluble functionalized modified graphene solution was obtained, and part of the precipitate was separated by centrifugation after ultrasonication for 30 minutes. After the solution was ultrasonicated again, the precipitated part was centrifuged to obtain PDDA functionalized modified graphene dispersed uniformly and long-term stable in the aqueous solution. The product was marked as PDDA- GN, a solution with a concen...

Embodiment 3

[0051] 1. Glassy carbon electrode substrate pretreatment:

[0052] The pretreatment method of the glassy carbon electrode substrate is the same as in Example 1.

[0053] 2. Preparation of PEI functionalized modified graphene

[0054] The preparation method of PEI functionalized modified graphene is the same as that of Example 1.

[0055] 3. Composite film self-assembly:

[0056] Place the pretreated electrode in 0.5mol / L H 2 SO 4 Cycle scanning within the potential range of -0.8 ~ 1.0V until a stable response curve is obtained. Then rinse it with deionized water, dry it slowly with nitrogen, immerse it in 1mg / mL PEI-GN solution for 20min, take it out, rinse it with deionized water, and dry it slowly with nitrogen gas to obtain a glass modified with a layer of PEI-GN. Carbon electrode substrate. Immerse the dried modified glassy carbon electrode substrate in 10mmol / L polyoxometalate H 3 wxya 11 o 40 (0.5mol / LH 2 SO 4 is the solvent) solution, soak for 20min, that is ...

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Abstract

The invention relates to a preparation method of a direct methanol fuel cell anode composite membrane catalyst, which comprises the following steps: previously preparing functional modified graphene, and pretreating a glassy carbon electrode substrate; carrying out layer-by-layer selfassembly on the functional modified graphene and polyoxometalate on the electrode to obtain a composite membrane of which the outermost layer is the functional modified graphene and polyoxometalate; and carrying out in-situ electrodeposition to obtain the anode composite membrane catalyst composed of the Pt nanoparticles, functional modified graphene and polyoxometalate. The composite membrane catalyst provided by the invention is prepared for the first time, and can be used as a direct methanol fuel cell anode catalyst. Compared with the pure platinum catalyst, the introduction of the functional modified graphene and polyoxometalate obviously enhances the electrocatalytic activity and CO poisoning resistance of the composite membrane catalyst; and the preparation method is simple, and has the advantage of lower cost. The invention provides a novel direct methanol fuel cell anode catalyst.

Description

technical field [0001] The invention relates to a method for preparing a direct methanol fuel cell anode composite membrane catalyst, in particular to a catalyst for direct methanol fuel cell anode catalysis and composed of platinum nanoparticles, functionalized modified graphene and polyoxometalates Preparation method of self-assembled composite membrane catalyst. Background technique [0002] Direct Methanol Fuel Cell (DMFC) has attracted more and more attention due to its wide range of fuel sources, convenient storage, simple structure, high reliability, no pollution, and long continuous power supply time, and has broad application prospects. However, the intermediate products in the methanol oxidation process will be strongly adsorbed on the surface of the catalyst, which will poison the catalyst and reduce the activity. With the accumulation of poisoned intermediate products on the electrode surface, the methanol oxidation current will continue to decrease. The new cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/18B01J37/34H01M4/90
CPCY02E60/50
Inventor 林深李忠水黄小妹
Owner FUJIAN NORMAL UNIV
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