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Preparation method of catalyst for direct methanol fuel cell and direct methanol fuel cell

A methanol fuel cell and catalyst technology, applied in the field of electrocatalysis, can solve problems such as unfavorable large-scale synthesis and complicated operation process

Active Publication Date: 2015-05-20
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of modifying the catalyst, the obtained catalyst carrier needs to be post-treated, that is, the heat treatment step, and the operation process is complicated, which is not conducive to large-scale synthesis.

Method used

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  • Preparation method of catalyst for direct methanol fuel cell and direct methanol fuel cell
  • Preparation method of catalyst for direct methanol fuel cell and direct methanol fuel cell
  • Preparation method of catalyst for direct methanol fuel cell and direct methanol fuel cell

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preparation example Construction

[0030] The invention provides a method for preparing a catalyst for a direct methanol fuel cell, including the following steps:

[0031] a) Redox reaction of carbon substrate and potassium permanganate in water to obtain carbon-based catalyst carrier;

[0032] b) Mixing the carbon-based catalyst carrier obtained in the step a) and the active material precursor, and after the reaction, the catalyst for the direct methanol fuel cell is obtained.

[0033] In the present invention, the carbon substrate and potassium permanganate are used as raw materials, and the redox reaction is carried out in the water phase to realize the modification of the carbon substrate and obtain the carbon substrate catalyst carrier.

[0034] In the present invention, it is preferable to first disperse the carbon substrate in water to obtain a suspension of the carbon substrate; then add potassium permanganate to the suspension of the carbon substrate to perform the oxidation-reduction reaction to obtain a carbo...

Embodiment 1

[0061] Disperse 80 mg of conductive carbon black of model Vulcan XC-72R in 200 mL of deionized water by ultrasound to obtain a dispersion of conductive carbon black. The resistivity of the deionized water is 18.2 MΩ·cm. 1.4mg KMnO is added to conductive carbon black 4 , And react for 6h under stirring to obtain a carbon-based catalyst carrier.

[0062] After the above reaction is completed, add 1.105 mL of a chloroplatinic acid aqueous solution with a mass concentration of 18.105 mgPt / mL to the resulting reaction solution, and after stirring for 4 hours at room temperature, dropwise add NaBH with a mass concentration of 1 mg / mL to it. 4 After stirring the solution for 5 hours, the obtained reaction solution was suction filtered and washed with deionized water. The resistivity of the deionized water was 18.2MΩ·cm, and it was suction filtered until there was no Cl - Exist, the final solid was vacuum dried at 80°C to obtain platinum-supported carbon-based catalyst carrier, that is, a ...

Embodiment 2

[0070] Take 80mg of conductive carbon black model Vulcan XC-72R and 2.7mg KMnO 4 As a raw material, a carbon-based catalyst support was obtained according to the method described in Example 1, and catalytic platinum was deposited on the carbon-based catalyst support according to the method described in Example 1, to obtain a catalyst for a direct methanol fuel cell. The obtained 5 mg of catalyst was added to 50 μL of Nafion solution and 1 mL of ethanol for ultrasonic dispersion for 30 minutes to obtain a dispersion solution of the catalyst; 10 μL of the dispersion solution of the catalyst was dripped on the glassy carbon electrode and dried at room temperature to obtain a modified electrode.

[0071] The modified electrode is used as the working electrode, the Ag / AgCl electrode is used as the reference electrode, the Pt sheet is used as the counter electrode, and the three-electrode system is used to remove oxygen with a molar concentration of 0.5 mol / L H 2 SO 4 Carry out cyclic vo...

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Abstract

The invention provides a preparation method of a catalyst for a direct methanol fuel cell. The preparation method comprises the following steps: a) conducting a redox reaction on a carbon substrate and potassium permanganate in water to obtain a carbon based catalyst carrier; and b) mixing and reacting the carbon based catalyst carrier obtained in the step a) with an active material precursor to obtain the catalyst for the direct methanol fuel cell. According to the method provided by the invention, the carbon substrate and potassium permanganate are used as raw materials, and treated with a one-pot reaction in water to obtain the carbon based catalyst carrier; and the obtained carbon based catalyst carrier does not need to be treated with complex post-treatment, and the active material can be deposited directly on the carbon based catalyst carrier to obtain the direct methanol fuel cell. The method provided by the invention is simple, easy to operate, and conducive to large-scale industrial production; and the obtained catalyst has high resistance to CO toxicity and high performance, and has better catalytic activity on methanol.

Description

Technical field [0001] The invention relates to the technical field of electrocatalysis, in particular to a method for preparing a catalyst for a direct methanol fuel cell and a direct fuel methanol cell. Background technique [0002] Direct methanol fuel cell is a variant of proton exchange membrane fuel cell. It directly uses methanol aqueous solution or steam methanol as the fuel supply source, and uses air or oxygen as the oxidant to directly convert chemical energy into electrical energy without the need for methanol, Reforming gasoline and natural gas to produce hydrogen for power generation. Methanol is converted into carbon dioxide, protons and electrons at the anode. Just like a standard proton exchange membrane fuel cell, protons react with oxygen at the cathode through the proton exchange membrane. The electrons reach the cathode through the external circuit and perform work, thereby converting chemical energy into electrical energy. . Direct methanol fuel cell is a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/656B01J23/68H01M4/88H01M4/90H01M4/92
CPCY02E60/50
Inventor 邢巍司凤占刘长鹏廖建辉梁亮李晨阳张玉微
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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