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PTFE/C composite powder for low temperature fuel cell electrode and its uses

A fuel cell electrode and composite powder technology, which is applied to battery electrodes, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. Advanced problems, to achieve the effect of high equipment requirements and complex preparation process

Active Publication Date: 2009-08-12
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Based on the current electrode preparation methods, there are problems such as low catalyst utilization rate, weak electrode gas mass transfer ability, and prone to flooding. The purpose of the present invention is to provide a preparation method of electrode construction material PTFE / C and its The method for preparing electrodes for low-temperature fuel cells aims to improve the utilization rate of catalysts and prepare electrodes with excellent electrochemical performance. The electrodes have strong gas mass transfer capabilities and are not prone to water flooding.

Method used

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  • PTFE/C composite powder for low temperature fuel cell electrode and its uses
  • PTFE/C composite powder for low temperature fuel cell electrode and its uses
  • PTFE/C composite powder for low temperature fuel cell electrode and its uses

Examples

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Embodiment 1

[0031] Preparation of PTFE / C composite powder:

[0032] Take 5.0g VulcanXC-72 conductive carbon black, wet it with 10mL isopropanol solution, add 150mL deionized water, stir mechanically for 15min, and then perform ultrasonic treatment for 30min. Then, under mechanical stirring, 50g of 10wt% PTFE emulsion was slowly added dropwise, heated and dried under stirring to prepare a PTFE / C composite precursor with a PTFE content of 50wt%. Put this precursor into a microwave oven (LG WD700, 700W, 2450MHz), and perform a heating procedure of microwave heating for 5s and stopping for 20s four times to remove residual water in the sample. Subsequently, the heating procedure of heating for 20s and stopping for 60s was carried out twice, and after the temperature of the sample dropped to room temperature, it was weighed to obtain a PTFE / C composite powder with a PTFE content of 30wt%. Its SEM photo and EDX spectrogram are shown in accompanying drawing 1, from appendix Figure 1a It can be...

Embodiment 2

[0037] Preparation of PTFE / C composite powder:

[0038] Take 5.0g of acetylene black, wet it with 10mL of isopropanol solution, add 500mL of deionized water, stir mechanically for 15min, and then perform ultrasonic treatment for 30min. Then, under mechanical stirring, 0.51g of 10wt% PTFE emulsion was slowly added dropwise, and heated and dried under stirring to prepare a PTFE / C composite precursor with a PTFE content of 1wt%. Put this precursor into a microwave oven (LG WD700, 700W, 2450MHz), and perform a heating procedure of microwave heating for 5s and stopping for 20s four times to remove residual water in the sample. Subsequently, the heating procedure of heating for 20s and stopping for 60s was repeated to obtain a PTFE / C composite powder with a PTFE content of 0.5 wt%.

[0039] Membrane electrode preparation:

[0040] Get 20.0mg50wt%Pt / C catalyst (purchased from Tanaka Company, add 2mL isopropanol solution, after ultrasonic dispersion for 15min, add 70.6mg5wt%Nafion s...

Embodiment 3

[0042] Preparation of PTFE / C composite powder:

[0043] Take 5.0g of acetylene black, wet it with 10mL of isopropanol solution, add 500mL of deionized water, stir mechanically for 15min, and then perform ultrasonic treatment for 30min. Then, under mechanical stirring, 80g of 10wt% PTFE emulsion was slowly added dropwise, heated and dried under stirring to prepare a PTFE / C composite precursor with a PTFE content of 62wt%. Put this precursor into a microwave oven (LG WD700, 700W, 2450MHz), and repeat the heating procedure of microwave heating for 5s and stopping for 20s to remove the residual water in the sample. Subsequently, the heating procedure of heating for 20s and stopping for 60s was repeated to obtain a PTFE / C composite powder with a PTFE content of 50 wt%.

[0044] Membrane electrode preparation:

[0045] Get 20.0mg 50wt% Pt / C catalyst (purchased from Tanaka Company, add 2mL isopropanol solution, after ultrasonic dispersion for 15min, add 266.7mg5wt%Nafion solution (...

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Abstract

The invention relates to an electrode for a low-temperature fuel cell, specifically PTFE / C composite powder used for the electrode of the low-temperature fuel cell. The carbon-supported polytetrafluoroethylene composite is prepared conveniently and rapidly by using microwave dielectric heating technique. The composite is in powder form after preparation without needing any mechanical mill, and the particle size of the powder is in the range from 5-30 Mu m. A proton-conducting polymer (such as Nafion) is loaded on a catalyzer by using a liquid-phase in-situ precipitation method, to make a catalyzer / proton-conducting polymer composite, and the atalyzer / proton-conducting polymer composite is added to the PTFE / C composite to make a catalyzer / proton-conducting polymer / PTFE / C composite which is the basic structural unit of an electrode and used to prepare electrodes. The electrode prepared by the method has a catalyzer utilization rate above 50 percent, has sufficient transmission channels for gas, proton, electron and water, and exhibits excellent electrochemical property.

Description

technical field [0001] The present invention relates to a low-temperature fuel cell electrode, in particular to a low-temperature fuel cell such as proton exchange membrane fuel cell (PEMFC) or direct alcohol fuel cell (DMFC) electrode construction material PTFE / C composite powder and its electrode in the application. Background technique [0002] A fuel cell is a power generation device that converts chemical energy directly into electrical energy in an efficient and environmentally friendly manner. It has the advantages of high energy density, high energy conversion efficiency, no pollution, and can form battery stacks with different powers according to the needs of the application. It is considered to be a high-efficiency, energy-saving, and environmentally friendly power generation technology in the 21st century. According to the different electrolytes used, fuel cells can be divided into alkaline fuel cells (AFC), phosphoric acid fuel cells (PAFC), molten carbonate fue...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01B1/24
CPCY02E60/50
Inventor 田植群衣宝廉梁永民王晓丽钟和香张华民
Owner SUNRISE POWER CO LTD
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