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Preparation method of expanded graphite monopole plate with high gas barrier property, and hydrogen fuel cell

An expanded graphite, gas barrier technology, applied in fuel cells, fuel cell components, climate sustainability, etc., can solve the problems of low thermal conductivity, poor gas barrier, low hydrogen utilization rate, etc., to improve electrical conductivity And thermal conductivity, thermal conductivity improvement, the effect of improving energy conversion efficiency

Active Publication Date: 2019-05-28
日照市烯创新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of low thermal conductivity, poor gas barrier property, and low hydrogen utilization rate of existing expanded graphite unipolar plates, the present invention provides a method for preparing expanded graphite unipolar plates with high gas barrier properties and a hydrogen fuel cell. The prepared expanded graphite unipolar plate is used in hydrogen fuel cells, which can significantly improve the gas conversion efficiency of hydrogen fuel cells

Method used

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  • Preparation method of expanded graphite monopole plate with high gas barrier property, and hydrogen fuel cell
  • Preparation method of expanded graphite monopole plate with high gas barrier property, and hydrogen fuel cell
  • Preparation method of expanded graphite monopole plate with high gas barrier property, and hydrogen fuel cell

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specific Embodiment approach 1

[0026] Embodiment 1: This embodiment records a method for preparing a high gas-barrier expanded graphite unipolar plate, and the steps of the method are as follows:

[0027] Step 1: Mold preparation: prepare corresponding molds according to the shape and size of the expanded graphite unipolar plate, and the mold material is high-strength graphite;

[0028] Step 2: designing the relative position of the graphene film and the expanded graphite powder, and pre-pressing the expanded graphite powder so that the expanded graphite has a higher density;

[0029] Step 3: hot-press sintering forming: the graphene film and the pre-pressed expanded graphite are combined into a whole by hot-press sintering to obtain an expanded graphite unipolar plate containing a highly oriented graphene film. A pair of unipolar plates and a proton exchange membrane can be combined to form a bipolar plate, thereby obtaining a hydrogen fuel cell.

specific Embodiment approach 2

[0030] Specific embodiment two: the preparation method of a kind of high gas-barrier expanded graphite unipolar plate described in specific embodiment one, in step 2, the relative position of described graphene film and expanded graphite powder is the following three kinds Either:

[0031] (1) The bottom layer is graphene film, and the top layer is expanded graphite powder; specifically, the method is as follows: spread a layer of graphene film on the bottom of the mold; evenly spread expanded graphite powder in the mold covered with graphene film, and scrape the surface flat; use a press to pre-press the expanded graphite powder;

[0032] (2) The bottom layer is expanded graphite powder, and the top layer is graphene film; specifically, the method is as follows: spread the expanded graphite powder evenly in the mold, and scrape the surface; use a press to pre-press the expanded graphite powder; Lay a layer of graphene film on the formed expanded graphite;

[0033] (3) The b...

specific Embodiment approach 3

[0034] Specific embodiment three: the preparation method of a kind of high gas-barrier expanded graphite unipolar plate described in specific embodiment one, in step two, the specific conditions of the described pre-compression molding are: apply 0.5 to the expanded graphite powder with a press ~1MPa pressure, the press pressurizes at a constant speed of 5~20mm / min, and keeps the pressure for 1~5min after reaching the given pressure.

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Abstract

The invention discloses a preparation method of an expanded graphite monopole plate with high gas barrier property, and a hydrogen fuel cell, and belongs to the technical field of hydrogen fuel cells.The method comprises the following steps: mold preparation: preparing a corresponding mold according to the shape and size of an expanded graphite monopole plate, wherein the mold is made of high-strength graphite; designing the relative positions of the graphene film and the expanded graphite powder, and prepressing and molding the expanded graphite powder; and hot-pressing sintering molding: combining the graphene film and the pre-pressed expanded graphite into a whole through hot-pressing sintering to obtain the expanded graphite monopole plate containing the graphene film. The layer of graphene film is added in the expanded graphite monopole plate, so that the hydrogen utilization rate and the oxygen utilization rate of the hydrogen fuel cell are greatly improved, gas waste is reduced, the energy conversion efficiency of the hydrogen fuel cell is further improved, and meanwhile, the safety performance of the hydrogen fuel cell can also be improved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen fuel cells, and in particular relates to a preparation method of a high gas-barrier expanded graphite monopolar plate and a hydrogen fuel cell. Background technique [0002] As a highly efficient, non-polluting and clean energy, hydrogen fuel cells have been widely used in many fields such as automobiles and aerospace. The bipolar plate is the main component of a hydrogen fuel cell, consisting of a hydrogen unipolar plate, an oxygen unipolar plate, and a proton exchange membrane between the two plates. The hydrogen unipolar plate and one side of the proton exchange membrane form a hydrogen cavity filled with hydrogen catalyst, and the oxygen unipolar plate and the other side of the proton exchange membrane form an oxygen cavity. In the hydrogen chamber, the hydrogen molecules are oxidized to generate electrons and hydrogen protons. The hydrogen protons enter the oxygen chamber through the proton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0228H01M8/0282H01M8/0213
CPCY02P70/50Y02E60/50
Inventor 李宜彬
Owner 日照市烯创新材料科技有限公司
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