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Preparation method of fuel cell Pt/Graphene catalyst

A fuel cell and catalyst technology, which is applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of lack of marketization of fuel cells, poor corrosion resistance of activated carbon, and high price of platinum. , to achieve the effect of good oxygen reduction performance, reducing viscosity and improving catalytic activity

Active Publication Date: 2014-07-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Currently commercially available fuel cell cathode catalysts are platinum-carbon catalysts, that is, activated carbon-supported platinum catalysts. Platinum is expensive and the corrosion resistance of activated carbon is not very good, which is an important reason why fuel cells are not currently marketed.

Method used

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  • Preparation method of fuel cell Pt/Graphene catalyst
  • Preparation method of fuel cell Pt/Graphene catalyst
  • Preparation method of fuel cell Pt/Graphene catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, the present embodiment prepares the Pt / Graphene catalyst according to the following steps:

[0035] (1) Preparation of graphite oxide

[0036] It has been more than 150 years since Brodie prepared graphite oxide (Graphite Oxide, GO) in 1855, and various methods for preparing graphite oxide have been studied during this period. There are three main preparation methods at present, namely: Brodie method, Staudenmaier method and Hummers method. Among them, the timeliness of the preparation process of the Hummers method is relatively good and the preparation process is also relatively safe, which is currently the most commonly used one. The present invention improves the original Hummers on the basis of low-temperature intercalation, medium-temperature deep oxidation and high-temperature complete oxidation to prepare graphite oxide. Such as figure 1 As shown, the specific steps are as follows:

[0037] Place a 250ml three-necked flask in an ic...

Embodiment 2

[0048] During the experiment, it was found that adding a small amount of water can change the oxygen reduction performance of the catalyst. For this reason, four sets of reactions were set up to explore the influence of water content on the performance of the catalyst. Under the condition of optimal microwave time, the capacity of adding water is respectively 0%, 10%, 30%, 50% of the total solvent volume (total volume of deionized water and ethylene glycol) to explore the influence of solvent on catalyst performance .

Embodiment 3

[0050] The optimal microwave time obtained in Example 1 and the optimal solvent ratio explored in Example 2 were used to explore the influence of pH value on catalyst performance. The effects of catalysts were explored at pH=4, pH=7, pH=8, pH=9 respectively.

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Abstract

The invention discloses a preparation method of a fuel cell Pt / Graphene catalyst. The method comprises the following steps: (1) preparing graphite oxide by use of an improved Hummers method; (2) grinding the graphite oxide into powder, and calcining the powder in a muffle furnace to obtain expanded graphite oxide; (3) preparing a graphene load Pt catalyst by use of a microwave-assisted ethylene glycol method. According to the preparation method, the Pt / Graphene catalyst is prepared by taking the expanded graphite oxide as the precursor of the reaction, and a dispersing auxiliary agent is not added in the reaction process; the method has the advantage that the graphene of the product can be more thoroughly reduced, and the catalytic activity of the catalyst is prevented from being influenced by the residual dispersing auxiliary agent, so that the product has better oxygen reduction performance.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, which is used in fuel cells. Background technique [0002] Currently commercially available fuel cell cathode catalysts are platinum-carbon catalysts, that is, activated carbon-supported platinum catalysts. Platinum is expensive and the corrosion resistance of activated carbon is not very good, which is an important reason why fuel cells are not currently marketed. Under such conditions, scientific researchers have conducted research on it, and are committed to researching low-cost catalysts to reduce the cost of fuel cells, so that fuel cells can achieve the goal of industrialization as early as possible. [0003] Catalysts with high catalytic activity, good stability and corrosion resistance are the key to the commercialization of fuel cell cathode catalysts. In the supported catalyst, the carrier plays a key role, which has been reported in many literatures, and various catalyst carriers h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J37/34H01M4/90H01M4/92
CPCY02E60/50
Inventor 周育红李叶
Owner HARBIN INST OF TECH
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