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
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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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