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Polymer loaded catalyst electrode in fuel cell and its prepn. method

A technology for supporting catalysts and fuel cells, applied to battery electrodes, circuits, electrical components, etc., can solve the problem of low utilization rate of catalyst Pt, achieve the effects of improving catalyst utilization rate, optimizing electrode structure, and simple and easy process

Inactive Publication Date: 2005-01-12
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] The present invention aims at the problem that the carrier carbon used in the preparation of the fuel cell electrode can only conduct electrons and the utilization rate of the catalyst Pt inside the carrier is low, and proposes that the electrode is composed of a support layer and a conductive polymer polyaniline covered on the support layer and a catalyst Pt or Pt - Composition of Ru alloy, using high-molecular polyaniline with dual conductivity of electrons and protons and high stability instead of traditional carbon materials as the carrier of dispersed catalyst Pt

Method used

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Embodiment Construction

[0016] Below in conjunction with embodiment, further illustrate this description.

[0017] 1. Pretreatment of support layer carbon paper

[0018] The selected support layer is carbon paper, put the electrode support layer carbon paper in 10% NaOH solution, boil for 20 minutes, rinse with distilled water until neutral, and then wash in 10% HNO 3 The solution was boiled for 20 minutes, rinsed with distilled water until neutral.

[0019] 2. Electropolymerization of aniline

[0020] After the carbon paper electrode is treated and cleaned, it is put into the electrolytic cell, and the electrolytic cell is filled with 0.2mol L -1 Aniline plus 0.5 mol L -1 h 2 SO 4 solution in the electrolytic cell. The electrochemical method of cyclic voltammetry is used to control the scanning potential range between -0.2V-1.0V (relative to the calomel electrode), the number of cycles is 11, and the scanning rate is 50mV per second. Electropolymerization of polyaniline on carbon paper.

[...

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Abstract

Disclosed pole is composed of support layer, conducting macromolecule polyaniline and catalyst Pt or Pt-Ru alloy. Macromolecule polyaniline, which possesses dual electron and proton conduction and high stability, instead of traditional carbon material is as carrier for dispersing catalyst Pt. Carrying out activating treatment for support layer of pole, and using electrochemical method polymerizes polyaniline on the support layer of pole. Using electrodeposit method deposits Pt or Pt / Ru to polyaniline. Features of the invention are: raising degree of dispersion of catalyst, enlarging area of catalyst, transferring H+ to electrolyte to raise use ratio of Pt; quick preparing procedure, easy of implementation and good repeatability.

Description

technical field [0001] The invention relates to a catalytic electrode material in a fuel cell and its preparation. Background technique [0002] Fuel cells have the advantages of less energy loss, low pollution, high energy density, and low noise, and are considered to be the most promising chemical power sources for electric vehicle power and other civilian applications in the future. At present, the key technology for the preparation of fuel cells is mature, but the electrodes of fuel cells mostly use Pt as a catalyst. Since Pt is a noble metal, its resources are limited and expensive, so the biggest obstacle restricting the application of fuel cells is the high production cost. In order to reduce the cost and reduce the amount of Pt, the commonly used method is to select materials with high specific surface area such as graphite, activated carbon, etc. The dispersion of Pt means reducing the amount of Pt and increasing the utilization rate of Pt. However, the traditiona...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/94
CPCY02E60/50
Inventor 王新东武克忠孟旭
Owner UNIV OF SCI & TECH BEIJING
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