Study On Self-Humidified Proton Exchange Membrane Fuel Cell

Fuel cells attract human's more and more interesting by the virtue of high energy density, high power density and no pollution. Proton exchange membrane fuel cell has the advantage of low working temperature, variable scale, quick startup, and stands out among all kinds fuel cell. The research of fuel cell, bipolar plates and self-humidification technology has been reviewed, and the raw material used in bipolar plate preparation, the water distribution in un-humidified PEMFC, the feasibility of supplying gas in series were studied, self-humidified structure of stack was designed and the effect of operation condition on the stack was investaged.The carbon-polymer bipolar plates were prepared by mould press method with the composite of MCMB and PPS under 400℃. The performance of the prepared bipolar plates was tested, such as density, resistivity, bending intensity and unpenetrability, and the micro-morphology were investigated by scaning electron microscopy (SEM). The resuts show that the prepared bipolar plates have excellent performance and easy to be manufactured. The borderline of carbon group and the region of PPS can be seen in SEM. The uniformity of mixed material is the key technology to effect the performance of bipolar plates.The water distribution in fuel cell was studied by the liquid water collecting system designed in lab. The difference to the method of collecting water in tail gas is that, the self-designed water collecting system can investage the superfluous liquid water of cathode directly, and can study the water shortage of anode without humidification. The results show that, the anode is shortage of water, and the water of receiver reaches anode by fiberglass colligation, the cathode water is sufficient, and the superflous liquid water reaches vessel by fiberglass colligation. The amount of water collected at cathode was close to the sum of generated water and supplied to anode.The feasibility of supplying gas in series was studied by three cell-stack. Difference to the traditional stack was that, the novel stack was designed as a...