Metal gas diffusion layer used for fuel cell and preparation method thereof

A gas diffusion layer and fuel cell technology, used in electrical components, battery electrodes, circuits, etc., can solve the problems of fracture failure gas, small compressive modulus, difficult to enter, etc., to improve performance, reduce contact resistance, and improve mass transfer. Effects of Features

Active Publication Date: 2011-06-01
上海氢晨新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a metal gas diffusion layer for fuel cells and a preparation method thereof, which solves the problems of fracture failure and Problems such as difficult gas entry

Method used

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  • Metal gas diffusion layer used for fuel cell and preparation method thereof
  • Metal gas diffusion layer used for fuel cell and preparation method thereof
  • Metal gas diffusion layer used for fuel cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]The stainless steel wire bundle with a diameter of 1 mm is drawn by the cluster drawing method to obtain a stainless steel fine fiber bundle with an average diameter of 5 μm, and the fine fiber bundle is cut into short fibers with an average length of 3 mm, and the short fibers are prepared by bulking treatment. Bulk felt with randomly distributed short fibers. The bulky felt was put into a vacuum furnace for high-temperature sintering at a temperature of 1000° C. to obtain a stainless steel fiber sintered felt with a thickness of 0.15 mm.

[0028] Cut stainless steel fiber sintered felt samples for pretreatment: wash with 0.2M dilute sodium hydroxide solution for several times to remove surface organic matter, then wash with 0.6M dilute sulfuric acid solution for several times to remove surface metal ions, and then wash with deionized water ,drying. The above cleaning process adopts ultrasonic cleaning technology. Put the pretreated sample into the closed-field unbala...

Embodiment 2

[0032] The stainless steel strands with a diameter of 1mm are stretched by cluster drawing method to obtain stainless steel fine fiber bundles with an average diameter of 10μm, and the fine fiber bundles are cut into short fibers with an average length of 4mm, and the short fibers are randomly oriented after bulking treatment. Distributed bulky felt. Put the bulky felt into a vacuum furnace for high-temperature sintering at a temperature of 1050° C. to obtain a stainless steel fiber sintered felt with a thickness of 0.17 mm.

[0033] Cut stainless steel fiber sintered felt samples for pretreatment: wash with 0.4M dilute sodium hydroxide solution for several times to remove surface organic matter, then wash with 1.0M dilute sulfuric acid solution for several times to remove surface metal ions, wash with deionized water, Cook for 30 minutes in an aqueous solution of 5 wt% oxalic acid at a temperature of 70° C., wash with deionized water, and dry. The above cleaning process adop...

Embodiment 3

[0037] The stainless steel wire bundle with a diameter of 2mm is drawn by the cluster drawing method to obtain a stainless steel fine fiber bundle with an average diameter of 12.5μm, and the fine fiber bundle is cut into short fibers with an average length of 6mm, and the short fibers are prepared by bulking A bulky mat with random distribution of short fibers is obtained. Put the bulky felt into a vacuum furnace for high-temperature sintering at a temperature of 1100° C. to obtain a stainless steel fiber sintered felt with a thickness of 0.19 mm.

[0038] Cut stainless steel fiber sintered felt samples for pretreatment: wash with 1.0M dilute sodium hydroxide solution for several times to remove surface organic matter, then wash with 1.0M dilute sulfuric acid solution for several times to remove surface metal ions, and wash with deionized water , boiled for 30 minutes in an aqueous solution of oxalic acid with a concentration of 10 wt % at a temperature of 70° C., washed with ...

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Abstract

The invention relates to a metal gas diffusion layer used for a fuel cell and a preparation method thereof. The preparation method comprises the following steps: preparing a stainless steel short fiber sintering felt by adopting a vacuum high temperature sintering method, then sequentially preparing a chromium layer and a graphite layer on the pretreated stainless steel short fiber sintering feltby adopting a closed field unbalanced magnetron sputtering ion plating technology, and then carrying out hydrophobic processing on the entire of the coated stainless steel short fiber sintering felt by utilizing polytetrafluoroethylene; and finally coating powdered carbon on the surface by adopting an ultrasonic oscillation method to obtain the metal gas diffusion layer used for the fuel cell. Inthe invention, stainless steel fiber with low price is taken as raw material, the high temperature vacuum sintering method is adopted to prepare the sintering felt, and the magnetron sputtering ion plating technology is utilized to prepare a carbon coating so as to improve the contact performance and anti-corrosion performance of the metal gas diffusion layer, thus the high-performance gas diffusion layer used for the fuel cell is prepared with low cost.

Description

technical field [0001] The invention relates to materials and methods in the technical field of fuel cells, in particular to a metal gas diffusion layer for fuel cells and a preparation method thereof. Background technique [0002] Fuel cell is an efficient and environment-friendly power generation device, which directly converts the chemical energy stored in fuel and oxidant into electrical energy. It has been favored by governments and research institutions of various countries under the background of vigorously developing low-carbon economy and building a low-carbon society. highly valued. Proton exchange membrane fuel cell PEMFC has the advantages of fast start-up, low operating temperature, no noise and no pollution, etc., and has broad application prospects in electric vehicles, household residences, small and medium-sized power stations and portable devices. The main body of a typical proton exchange membrane fuel cell is a bipolar plate, a repetition of MEAs and cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 易培云来新民彭林法邱殿凯倪军
Owner 上海氢晨新能源科技有限公司
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