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Fuel cells, carbon composite structures and methods for manufacturing the same

A composite structure and fuel cell technology, applied in the direction of fuel cells, fuel cell parts, chemical instruments and methods, etc., can solve problems such as complicated methods, reduced battery efficiency, and increased production costs

Active Publication Date: 2013-01-16
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method is cumbersome, increases production cost and reduces battery performance

Method used

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  • Fuel cells, carbon composite structures and methods for manufacturing the same
  • Fuel cells, carbon composite structures and methods for manufacturing the same

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preparation example Construction

[0021] The invention provides a method for preparing a carbon composite structure. First, a micron oxygen web is provided. In one embodiment of the present invention, the micron oxygen fiber web may be a commercially available micron carbon fiber web such as Toray-090 or SGL-35EC after high temperature oxidation. In another embodiment of the present invention, the oxidized carbon fiber with a diameter of micron can be needle punched, paper-made or woven to form a non-woven fabric, paper-made or woven fabric, that is, a micron oxygen fiber web. In an embodiment of the present invention, the micron oxygen fiber web can be further thinned and formed, and the thinning and forming method can be thinning by hot pressing.

[0022] Next, a polymer such as polyacrylonitrile, pitch fiber or phenolic fiber is dissolved in a polar solvent to form a polymer solution. Polar solvents suitable for dissolving polymers can be N, N-dimethylformamide, N, N-dimethylethylamine, dimethyl sulfoxide...

Embodiment 1

[0031] Embodiment 1 prepares micron carbon fiber mesh

[0032] Take oxidized fibers with a diameter of 6 μm to 7 μm (oxidized fibers purchased from Xinxian (Stock) Co., Ltd.), and form a non-woven fabric with a thickness of 3 mm by needle punching. The base weight of the above non-woven fabric is 300g / m 2 . The above non-woven fabric was heated up to 1500°C at a heating rate of 10°C / min under nitrogen to carbonize the oxidized fibers of the non-woven fabric into a micron carbon fiber network. The surface resistance of the above micron carbon fiber mesh is 299mΩ / cm 2 , the volume resistivity is 7mΩ·cm, the conductivity is 133S / cm, and the pressure resistance is 100kg / cm 2 , the pore size distribution is 3-12μm.

Embodiment 2

[0033] Embodiment 2 prepares micron carbon fiber mesh

[0034] Take oxidized fibers with a diameter of 6 μm to 7 μm (oxidized fibers purchased from Xinxian (Stock) Co., Ltd.), and form a non-woven fabric with a thickness of 3 mm by needle punching. The base weight of the above non-woven fabric is 300g / m 2 . Thinning the above non-woven fabric by hot pressing to form a denser non-woven fabric with a thickness of 1.5mm. Next, the thinned non-woven fabric was placed under nitrogen, and the temperature was raised to 1500° C. at a heating rate of 10° C. / min, so that the oxidized fibers of the non-woven fabric were carbonized into micron carbon fiber nets. The surface resistance of the above micron carbon fiber mesh is 246mΩ / cm 2 , the volume resistivity is 6mΩ·cm, the conductivity is 162S / cm, and the pressure resistance is 100kg / cm 2 . Compared with Example 1, the micron carbon fiber mesh thinned by hot pressing has higher electrical conductivity.

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Abstract

Disclosed is a method to manufacture a carbon composite structure. First, a polymer nano fiber net is provided. The polymer nano fiber net is thermal oxidized to form an oxidized nano fiber net. The oxidized nano fiber net and an oxidized micro fiber net are stacked and impregnated in a resin. The resin is oxidized. Finally, the oxidized nano fiber net, the oxidized micro fiber net, and the oxidized resin are carbonized at a high temperature to form the carbon composite structure.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a gas diffusion layer in a fuel cell and a preparation method thereof. Background technique [0002] Please refer to figure 1 , the fuel cell (fuel cell, hereinafter referred to as FC) is composed of two pieces of catalyst layer 13, gas diffusion layer 15, bipolar plate 17 (bipolar plate), collector plate 18 (current collector) and end plate 19 (end plate) ) composed of a proton conducting membrane 11 between. The two sides separated by the proton conducting membrane 11 are the anode (hydrogen or recombined gas or methanol) and the cathode (oxygen or air) respectively. 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 anode and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/04H01M8/02
CPCH01M2008/1095H01M8/0234H01M8/02H01M8/1011Y02E60/50H01M8/0245B32B27/04Y10T442/10Y02P70/50
Inventor 陈琬琡韩姿娴郑淑蕙
Owner IND TECH RES INST