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Novel use of hydrophobing agent/conductive carbon material composite body

A hydrophobic agent, conductive carbon technology, applied in the direction of catalyst carriers, circuits, electrical components, etc., can solve the problems of low utilization rate of catalyst active particles, electrodes easily flooded, etc., to achieve continuous proton conduction network and reduce transmission. Mass polarization loss, the effect of optimal battery output performance

Inactive Publication Date: 2009-06-24
SAIC MOTOR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the problem that in the preparation process of traditional hydrophobic thick-layer electrodes, some catalyst active particles will be wrapped by polymers as hydrophobic agents and the utilization rate will be reduced, and there is no hydrophobic agent in traditional hydrophilic thin-layer electrodes, and the electrodes are easy to use. The problem of being "flooded" provides a new type of electrocatalyst carrier for fuel cells, its preparation and its application in the preparation of electrocatalysts and low-temperature fuel cell catalyst electrodes

Method used

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  • Novel use of hydrophobing agent/conductive carbon material composite body
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  • Novel use of hydrophobing agent/conductive carbon material composite body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Preparation of catalyst support:

[0052] Take 2.0g VulcanXC-72 conductive carbon black, wet it with 4mL isopropanol solution, add 60mL deionized water, stir mechanically for 15min, and then perform ultrasonic treatment for 30min. Then, under mechanical stirring, 8.6g of 10wt.% PTFE aqueous emulsion was slowly added dropwise, and fully stirred to uniformly mix the carbon black and PTFE. Then place it in a 90°C water bath for coagulation, remove the supernatant, and dry to prepare a PTFE / C composite precursor with a PTFE content of 30wt.%. Put this precursor into a microwave oven (700W, 2450MHz), and perform a heating procedure of microwave heating for 5s and stopping for 20s to remove residual water in the sample. Subsequently, the heating procedure of heating for 10s and stopping for 60s was repeated until the PTFE content was 9wt%. The obtained PTFE / VXC composite powder with a PTFE content of 9 wt%, is denoted as 9PTFE / VXC.

[0053] Catalyst preparation:

[0054] ...

Embodiment 2

[0059] Preparation of catalyst support:

[0060] Take 2.0 g of carbon nanotubes (CNT), wet it with 10 mL of isopropanol solution, add 100 mL of deionized water, stir mechanically for 15 min, and then perform ultrasonic treatment for 30 min. Then, under mechanical stirring, 30 g of 5wt.% FEP aqueous emulsion was slowly added dropwise, and stirred thoroughly, so that the nanotubes and FEP were uniformly mixed. Then place it in a 90°C water bath for coagulation, remove the supernatant, and dry to prepare a FEP / CNT composite precursor with a FEP content of 42wt.%. Put this precursor into a microwave oven (500W, 2450MHz), and perform a heating procedure of microwave heating for 5s and stopping for 20s to remove residual water in the sample. Subsequently, the heating procedure of heating for 15s and stopping for 60s was repeated until the FEP content was 20wt%. A FEP / CNT composite powder with a FEP content of 20 wt % was obtained, which was denoted as 20FEP / CNT.

[0061] Catalyst...

Embodiment 3

[0066] Preparation of catalyst support:

[0067] Take 2.0 g of pearl carbon black (Black Pearls 2000, BP), wet it with 30 mL of isopropanol solution, add 200 mL of deionized water, stir mechanically for 15 min, and then perform ultrasonic treatment for 30 min. Then, under mechanical stirring, 7.1 g of 10wt.% PTFE aqueous emulsion was slowly added dropwise, and stirred thoroughly, so that the pearl carbon black and PTFE were uniformly mixed. Then place it in a 90°C water bath for coagulation, remove the supernatant, and dry to prepare a PTFE / BP composite precursor with a PTFE content of 26wt.%. Put this precursor into a microwave oven (2KW, 2450MHz), and perform a heating procedure of microwave heating for 5s and stopping for 20s to remove residual water in the sample. Subsequently, the heating procedure of heating for 10s and stopping for 20s was repeated until the PTFE content was 15wt%. The obtained PTFE / BP composite powder with a PTFE content of 15 wt%, is denoted as 15PT...

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Abstract

The invention relates to the technical field of fuel batteries, and discloses novel use of a hydrophobing agent / conducting carbon material complex as an electro-catalyst carrier for a fuel battery. The complex can be taken as the electro-catalyst carrier for the fuel battery and used for preparing an electro-catalyst and an electrode. The invention also further discloses the electro-catalyst and the electrode prepared from the hydrophobing agent / conducting carbon material complex, and application thereof. As for the electro-catalyst prepared from the hydrophobing agent / conducting carbon material complex, the utilization rate of the catalyst is high; the transmission capability of reaction gas and reaction products is strong; the mass transfer polarization loss is small; the fuel battery assembled by the electro-catalyst has superior battery output performance; and the electro-catalyst is particularly suitable to be used in fuel batteries taking the air as an oxidant.

Description

technical field [0001] The invention relates to a fuel cell, in particular to the application of a hydrophobic agent / conductive carbon material composite used as an electrocatalyst carrier for the fuel cell. Background technique [0002] Fuel cells, as an efficient and environment-friendly power generation device, have received more and more attention. Low-temperature fuel cells (operating temperature ≤ 80°C) include proton exchange membrane fuel cells (PEMFC) and direct alcohol fuel cells (Direct alcohol fuel cells, DAFC), because of their high energy conversion rate, environmental friendliness, The advantages of low operating temperature are considered to have broad application prospects in automotive power, mobile power and small power stations. [0003] The electrodes are where the electrochemical reactions take place in the fuel cell. For example, the electrochemical reduction reaction occurring on the cathode side in PEMFC and DAFC is: [0004] o 2 +4H + +4e - →H...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J23/40H01M4/90H01M4/92
CPCY02E60/50
Inventor 王晓丽冯力中谢先宇刘刚张华民邱艳玲
Owner SAIC MOTOR
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