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Oxygen reduction catalyst prepared from grapheme modified by macrocyclic compound, and preparation method thereof

A technology of macrocyclic compounds and cyclic compounds, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the cost and durability of platinum catalysts and cannot achieve large-scale Application, unsuitable for mass production, complex reaction conditions, etc., to achieve the effects of low cost, moderate processing conditions, and good catalytic activity

Inactive Publication Date: 2010-07-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the 1960s, the platinum catalyst used in the alkaline fuel cell used in the Apollo moon landing program catalyzed the four-electron reaction pathway, but due to the limited cost and durability of the platinum catalyst, it has been delayed to achieve large-scale application
Although this method can realize the 4e process of efficient oxygen reduction, there are still problems such as high reaction temperature, complex reaction conditions and difficult control, not suitable for mass production, and poor toxicity resistance.

Method used

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  • Oxygen reduction catalyst prepared from grapheme modified by macrocyclic compound, and preparation method thereof
  • Oxygen reduction catalyst prepared from grapheme modified by macrocyclic compound, and preparation method thereof
  • Oxygen reduction catalyst prepared from grapheme modified by macrocyclic compound, and preparation method thereof

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Effect test

Embodiment 1

[0026] The graphene used in the present invention can be prepared by the following method, but is not limited to the following method.

[0027] Add 5 g of graphite to 87.5 mL of concentrated sulfuric acid and 45 mL of concentrated nitric acid and mix uniformly in an ice bath, then slowly add 55 g of potassium chlorate to the mixture, and continue stirring at room temperature for 96 hours to obtain graphite oxide. After the graphite oxide was dried at 80°C, it was peeled off in deionized water ultrasonically (60KHz). The obtained material was reacted with hydrazine hydrate (1 μL: 3 mg) at 80° C. for 24 hours to obtain graphene flakes.

Embodiment 2

[0029] After 2 mg of graphene and 5 mg of iron phthalocyanine (purchased from sigma aldrich) were dispersed in 10 mL of water at 60 KHz ultrasonic for 20 hours, the resulting suspension was filtered with a filter membrane with a pore size of 0.45 μm. The sample obtained after filtration was repeatedly washed with distilled water to wash away the unadsorbed iron phthalocyanine. Then the sample was dried at 80°C to obtain the phthalocyanine iron graphene composite.

Embodiment 3

[0031] The preparation of the phthalocyanine iron-graphene composite was as described in Example 2. The prepared phthalocyanine iron-graphene composite was dispersed in water to obtain a 2 mg / mL suspension. Take 4μL of the suspension and apply dropwise to the surface of the glassy carbon electrode. After the electrode is dried at room temperature, a glassy carbon electrode modified with a composite of graphene and iron phthalocyanine is obtained.

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Abstract

The invention discloses an oxygen reduction catalyst prepared from grapheme modified by a macrocyclic compound, and a preparation method thereof. The grapheme modified by a macrocyclic compound is used as the catalyst and is used for catalyzing the oxygen reduction of batteries under acidic, neutral and alkaline conditions. The catalyst can efficiently reduce oxygen in a solution, the direct 4e process can be realized, the spike potential of the oxygen reduction under alkaline condition can reach 0.1 V (vs. Ag / AgCl), and the stability is high. The catalyst has simple preparation process, low cost and good catalytic activity. The preparation method of the catalyst comprises the following steps of: firstly, conducting ultrasonic dispersion after proportionally mixing grapheme and the macrocyclic compound; then, filtering; and finally, drying to obtain the catalyst. In addition, the catalyst has great anti-poisoning effect on carbon monoxide, methanol, formaldehyde, glucose and the like which can poison a platinum catalyst. The oxygen reduction catalyst can be applied to the fields of proton exchange membrane fuel batteries, direct methanol fuel batteries, metal-air battery cathode materials and the like.

Description

Technical field [0001] The invention relates to a catalyst, in particular to an oxygen reduction catalyst for macrocyclic compound modified graphene and a preparation method thereof. Background technique [0002] The cathode oxygen reduction efficiency of fuel cells is of great significance in the performance of its performance, and the efficient oxygen reduction catalytic system of fuel cells is indispensable for its practical application. Cathodic oxygen reduction reaction pathways are divided into "two-electron reaction pathway" and "four-electron reaction pathway", of which the "four-electron reaction pathway" is more efficient. In the 1960s, the platinum catalyst used in the alkaline fuel cell used in the Apollo moon landing program catalyzed the four-electron reaction pathway. However, due to limitations in the cost and durability of the platinum catalyst, it was delayed to achieve large-scale application. In addition, the platinum catalyst will react with the carbon mono...

Claims

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Application Information

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IPC IPC(8): B01J31/22H01M4/90
CPCY02E60/50
Inventor 叶建山王景芳高霞马钊
Owner SOUTH CHINA UNIV OF TECH
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