Method for preparing proton exchange membrane fuel cell electrode with high catalyst utilization ratio

A fuel cell electrode, proton exchange membrane technology, applied in battery electrodes, circuits, electrical components, etc., to achieve the effect of low platinum loading, high electrocatalytic performance, and high utilization rate

Inactive Publication Date: 2010-01-13
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a high catalyst utilization rate

Method used

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  • Method for preparing proton exchange membrane fuel cell electrode with high catalyst utilization ratio
  • Method for preparing proton exchange membrane fuel cell electrode with high catalyst utilization ratio

Examples

Experimental program
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Embodiment 1

[0029] (1) Preparation of microporous layer

[0030] First, soak the carbon paper in an aqueous ethanol solution, oscillate for 30 minutes under ultrasonic conditions, and then soak it in a 30% polytetrafluoroethylene emulsion for 30 minutes, then place it in a muffle furnace at a temperature of 340°C and roast it for 40 minutes to obtain a hydrophobic Diffusion layer. Weigh PTFE and Vulcan XC-72 carbon powder according to the mass ratio of PTFE: Vulcan XC-72 carbon powder at 1:3, and then use ethanol as the solvent to oscillate uniformly under ultrasonic conditions, and apply multiple times On the hydrophobic diffusion layer, it was finally placed in a muffle furnace at a temperature of 340°C and fired for 45 minutes to obtain a microporous layer.

[0031] (2) Preparation of porous carbon electrode bonded with perfluorosulfonic acid resin

[0032] Weigh the perfluorosulfonic acid resin (mass concentration 0.5%) according to the mass ratio of perfluorosulfonic acid resin: Vulcan XC...

Embodiment 2

[0041] Step (1) is the same as step (1) in Example 1.

[0042] (2) Preparation of porous carbon electrode bonded with perfluorosulfonic acid resin

[0043] According to the mass ratio of perfluorosulfonic acid resin: Vulcan XC-72 carbon powder is 1:9, weigh the perfluorosulfonic acid resin (mass concentration is 0.5%), and then apply it to the micropores prepared in step (1) several times On the layer, the porous carbon electrode bonded with perfluorosulfonic acid resin was prepared by drying at 50°C.

[0044] (3) Preparation of catalytic electrode for proton exchange membrane fuel cell by ion exchange / electroreduction

[0045] The porous carbon electrode bonded with perfluorosulfonic acid resin prepared in step (2) is immersed in an aqueous solution of platinum dichlorotetraammine with a concentration of 0.5 mol / L, and immersed for 10 hours at 80°C. Clean with water. Then, a three-electrode system is adopted, with the ion-exchanged electrode as the working electrode, the platinum m...

Embodiment 3

[0048] Step (1) is the same as step (1) in Example 1.

[0049] (2) Preparation of porous carbon electrode bonded with perfluorosulfonic acid resin

[0050] According to the mass ratio of perfluorosulfonic acid resin: Vulcan XC-72 carbon powder is 1:1, weigh the perfluorosulfonic acid resin (the mass concentration is 0.5%), and then apply it to the micropores prepared in step (1) several times On the layer, the porous carbon electrode bonded with perfluorosulfonic acid resin was prepared by drying at 140°C.

[0051] (3) Preparation of catalytic electrode for proton exchange membrane fuel cell by ion exchange / electroreduction

[0052] The porous carbon electrode bonded with the perfluorosulfonic acid resin prepared in step (2) is immersed in an aqueous solution of platinum dichlorotetraammine with a concentration of 0.05 mol / L, and immersed for 0.5 hours at 10° C. Clean with water. Then, a three-electrode system is adopted, with the ion-exchanged electrode as the working electrode, th...

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PUM

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Abstract

The invention provides a method for preparing a proton exchange membrane fuel cell electrode with high catalyst utilization ratio, which comprises the following steps: firstly, constructing a gas porous electrode having a complete electron channel, a gas channel and a proton channel; secondly, exchanging platinum cations onto perfluorosulfonic acid resin of the gas porous electrode by an ion exchange method; thirdly, reducing the platinum cations onto a carbon carrier contacted with the perfluorosulfonic acid resin by an electrochemical reduction method, thus, the proton exchange membrane fuel cell electrode with high catalyst utilization ratio is prepared. The invention has the advantages of simple process and low cost. The proton exchange membrane fuel cell electrode with high catalyst utilization ratio prepared by using the invention has the advantages of high catalyst utilization ratio, low platinum capacity, good dispersion of platinum nano-particles, controllable size, and the like, and can replace the prior commercial platinum/carbon (Pt/C) catalyst.

Description

1. Technical Field: [0001] The invention belongs to the technical field of fuel cells, and particularly relates to a preparation method of a proton exchange membrane fuel cell electrode with a high catalyst utilization rate. 2. Background technology: [0002] Proton exchange membrane fuel cell (PEMFC) is a power generation device that converts chemical energy into electrical energy through an electrochemical reaction. It has the advantages of high energy density, low operating temperature and good stability. It is used in mobile equipment, electric vehicles (EV), Fields such as distributed power stations have broad application prospects. However, the high cost has always been one of the core problems that plagued its real commercialization. The main contribution of its high cost comes from the extensive use of electrocatalyst platinum. Due to the high price of platinum and the scarcity of resources, it has become more urgent to reduce the amount of platinum in PEMFC when a non-n...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 魏子栋陈四国李花李莉
Owner CHONGQING UNIV
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