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Graphite is charactered by good conductivity, good heat conduction and rust-resistance, but graphite contains many pores during their manufacturing process inevitably. H2 and O2 will be mixed if the graphite bipolar plates which contain pores are used in PEMFC ( proton exchange membrane fuel cell) , and the performance of fuel cell is low . Graphite bipolar plates were impregnated by thick Na2SiO3 solution in vacuum and pressure. Na2SiO3 in graphite plate was turned into SiO2 after being reacted with acid and heated. Porosity of graphite plate dropped to 3. 3 %from 18. 2%.No H2 leakage occurred at the pressure of 0 . 3 MPa.The resistance of graphite plate after impregnation did not rise. The voltage of fuel cell used…
Tiled arrangement of carbon felt and carbon fiber unidirectional arrangement of absorbing microwave absorbing properties of the composites, polyacrylonitrile based carbon fiber unidirectional arrangement is closely related to the suction arrangement spacing and wave properties of fiber and fiber content. Suction arrangement of carbon felt greatly influence the flat wave properties with carbon fiber content. At present, the negative effect of electromagnetic radiation has affected all aspects of human life. It is an effective way to reduce or eliminate electromagnetic wave pollution by absorbing materials. Graphite felt is one of the most commonly used structural absorbing materials, and has been widely used. By changing the cross section of the carbon fiber in the graphite felt, the surface modification of the…
The bipolar plate used therein are required to achieve higher electrical conductivity due to the requirements for redox flow batteries have become more and more stringent in recent years.and thus A bipolar plate composed of an electrically conductive composite achieves a higher electrical conductivity by increasing the conductive filler content in the material. Graphite was used as one of the main bipolar plate material in redox flow batteries due to its high electrical conductivity ,low weight and good chemical stability in the past.Graphite blocks were produced by sintering process and plates were machined to desired sizes.The main limitation of this method was the porosity of produced graphite plates. At present, our company provides a bipolar plate for a redox flow…
