Nano carbon fiber, fuel cell and forming method thereof

A nano-carbon fiber and nano-fiber technology, applied in fuel cells, solid electrolyte fuel cells, battery electrodes, etc., can solve the problems of multiple processing procedures and high carbonization temperature, achieve high conductivity and improve performance

Active Publication Date: 2010-09-01
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, this patent has many processing procedures and high carbonization temperature (2000°C)

Method used

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  • Nano carbon fiber, fuel cell and forming method thereof
  • Nano carbon fiber, fuel cell and forming method thereof
  • Nano carbon fiber, fuel cell and forming method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 13 g of polyacrylonitrile (purchased from Donghua Synthetic Fiber) was dissolved in 87 g of N,N-dimethylacetamide (hereinafter referred to as DMAc) to form a polyacrylonitrile polymer solution. The discharge spinning method is used for spinning, and the applied voltage is 39.5KV to form network-like nanofibers with diameters ranging from 200 to 700 nm. The above-mentioned nanofibers were placed in oxygen and heated at 270° C. for 180 minutes to obtain nano-oxygen fibers. Put the above-mentioned nano-oxygen fiber in nitrogen gas, carbonize the nano-oxygen fiber at 1000°C to make nano-carbon fiber, and its surface resistivity is 3.29Ω / cm 2 , the volume resistivity is 0.16Ω·cm.

Embodiment 2

[0037]Similar to Example 1, the difference is the temperature at which the nanofibers are oxidized. The nanofibers formed by spinning in Example 1 were placed in oxygen and heated at 280° C. for 180 minutes to obtain nanofibers. The conditions for subsequent carbonization of nano-oxygen fibers are the same, and the obtained carbon nano-fibers have a surface resistivity of 4.34Ω / cm 2 , the volume resistivity is 0.14Ω·cm.

Embodiment 3

[0039] Similar to Example 2, the difference lies in the method of carbonizing nano-oxygen fibers. With the microwave carbonization of 9kW the nano-oxygen fiber in embodiment 2, the nano-carbon fiber of gained, its surface resistivity is 1.42Ω / cm 2 , the volume resistivity is 0.29Ω·cm.

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Abstract

The invention provides a method for forming nano carbon fibers, comprising providing polyacrylonitrile solution; spinning the polyacrylonitrile solution for forming a plurality of nano fibers, wherein the nano fibers are overlapped together to form a net shape; carrying out thermal oxidation on the nano fibers for forming a plurality of nano-oxygen fibers; and carbonizing the nano-oxygen fibers for forming the plurality of nano carbon fibers, wherein the nano carbon fibers are overlapped together to form a net shape. The nano fiber has high conductivity and can further improve the performance of a fuel cell.

Description

technical field [0001] The present invention relates to a fuel cell, more particularly to a gas diffusion layer in a fuel cell and a method for forming the same. Background technique [0002] Please refer to figure 1 , a fuel cell (fuel cell, hereinafter referred to as FC) consists of a proton-conducting membrane 11 sandwiched between two catalyst layers 13, a gas diffusion layer 15, a bipolar plate 17 (bipolar plate), a collector plate 18 (current collector), and Formed between end plates 19 (end plates). The two sides separated by the proton conducting membrane 11 belong to the anode (hydrogen or recombined gas or methanol) and the cathode (oxygen or air). The anode undergoes an oxidation reaction, and the cathode undergoes a reduction reaction. When the hydrogen gas (or methanol) at the anode contacts the anode catalyst 13 (usually platinum or platinum alloy), it will dissociate into protons and electrons, and the electrons will pass through the connection between the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M8/10H01M4/88H01M4/86H01M4/96H01M8/0234
CPCY02E60/521Y02E60/50Y02P70/50
Inventor 张孝全郑淑蕙陈琬琡陈中屏
Owner IND TECH RES INST
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