Monopole plate for hydrogen fuel cell, preparation method thereof and hydrogen fuel cell

A fuel cell and unipolar plate technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of low hydrogen utilization rate and low thermal conductivity of unipolar plate, so as to improve energy conversion efficiency and hydrogen utilization rate , the effect of increasing the service life

Active Publication Date: 2019-05-28
山东国烯新材料创新中心有限公司
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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 and low hydrogen utilization rate of unipolar plates in hydrogen fuel cells, the present inven...

Method used

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  • Monopole plate for hydrogen fuel cell, preparation method thereof and hydrogen fuel cell
  • Monopole plate for hydrogen fuel cell, preparation method thereof and hydrogen fuel cell
  • Monopole plate for hydrogen fuel cell, preparation method thereof and hydrogen fuel cell

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specific Embodiment approach 1

[0040]Embodiment 1: This embodiment describes a hydrogen fuel cell unipolar plate. The existing hydrogen fuel cell bipolar plate consists of two unipolar plates and a proton exchange membrane between the two unipolar plates. constitute, wherein, one of the two unipolar plates is used as an oxygen unipolar plate, and the other is used as a hydrogen unipolar plate; the hydrogen unipolar plate and one side of the proton exchange membrane form a hydrogen cavity, and the hydrogen cavity The two ends are a hydrogen inlet and a hydrogen outlet respectively, and the inside of the hydrogen chamber is filled with a catalyst; the oxygen unipolar plate and the other side of the proton exchange membrane form an oxygen chamber, and the two ends of the oxygen chamber are respectively oxygen inlets and oxygen outlet; both ends of the hydrogen unipolar plate and the oxygen unipolar plate contain coolant inlets and coolant outlets, and the insides of the hydrogen chamber and the oxygen chamber a...

specific Embodiment approach 2

[0041] Embodiment 2: A method for preparing a monopolar plate for a hydrogen fuel cell described in Embodiment 1, the steps of the method are as follows:

[0042] Step 1: mold preparation: prepare a corresponding graphite mold according to the shape and size of the unipolar plate, and the material of the mold is high-strength graphite;

[0043] Step 2: Filling: spread the expanded graphite powder evenly in the mold, and scrape the surface; then add a layer of graphene powder, and scrape the surface; finally add expanded graphite powder, and scrape the surface;

[0044] Step 3: Preforming: Use a press to apply pressure to the filler obtained in Step 2. The press pressurizes at a constant speed of 5~20mm / min, and when it reaches 0.5~1MPa, keep the pressure for 1~5min to preform it to obtain a sandwich structure. , and then removed from the mold;

[0045] Step 4: Pre-sintering: Vacuum sinter the preformed sandwich structure at a temperature of 500-1000°C for 1-2 hours to remove ...

specific Embodiment approach 3

[0048] Embodiment 3: A method for preparing a monopolar plate for a hydrogen fuel cell described in Embodiment 2. In step 5, the densification molding described above adopts one of the following methods:

[0049] Method 1: Put the sintered preform into a graphite mold, and carry out hot-press sintering together with the graphite mold in a hot-press sintering furnace; the hot-press sintering process is as follows: from room temperature to The heating rate is raised to 700°C~2500°C, pressurized, the pressure is 20MPa~60MPa, the heat preservation and pressure holding time is 30~120min, and the whole hot pressing sintering process is carried out in a vacuum environment;

[0050] Method 2: put the sintered preform into a stainless steel mold, pressurize it on a hydraulic press, the pressure is 100~300MPa, and the pressure holding time is 5~30min; Graphitization treatment is carried out, the treatment time is 30~120min, and the entire densification molding process is carried out in ...

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Abstract

The invention discloses a monopole plate for a hydrogen fuel cell, a preparation method of the monopole plate and the hydrogen fuel cell, and belongs to the technical field of hydrogen fuel cell research. The monopole plate is prepared from expanded graphite and graphene. According to the preparation method, a graphene layer is added into the monopole plate, and the high-density (2-2.1 g/cm<-3>) monopole plate with an expanded graphite/graphene/expanded graphite sandwich structure is obtained by combining an in-situ densification means. Compared with a traditional monopole plate for the hydrogen fuel cell, the monopole plate provided by the invention has the advantages that due to the fact that the electrical conductivity (8 * 10<5>S/m) and the thermal conductivity (as high as 1500 Wm <-1>K<-1>) of the middle graphene layer are very high, the thermal conductivity and the electrical conductivity of the monopole plate are also greatly improved. And the conductivity of the monopole plateis improved, so that the electron transmission speed of the bipolar plate can be greatly improved, and the use efficiency of the whole hydrogen fuel cell is improved. And the service life of the hydrogen fuel cell can be prolonged by improving the heat-conducting property.

Description

technical field [0001] The invention belongs to the technical field of hydrogen fuel cell research, and in particular relates to a monopolar plate for a hydrogen fuel cell, a preparation method thereof, and a hydrogen fuel cell. Background technique [0002] Against the backdrop of the environmental storm, clean and sustainable energy has become our key energy technology. Due to its high power generation efficiency, less environmental pollution and many other advantages, fuel cells are gradually used in aerospace, electric vehicles and other fields, and have broad application prospects. Hydrogen fuel cell is a kind of fuel cell. Since its raw material is hydrogen, the products are water and carbon dioxide, and there is no problem of environmental pollution, it has gradually attracted attention. The core component of a hydrogen fuel cell is the bipolar plate. The bipolar plate is composed of two electrode plates with a proton exchange membrane sandwiched between them. The e...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/0213H01M8/0228H01M8/0267H01M8/22
CPCY02E60/50
Inventor 李宜彬
Owner 山东国烯新材料创新中心有限公司
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