Cathode performance of carbon-coated metal bipolar plate for polymer electrolyte membrane fuel cell

• Main Authors: Shun-Hsiung You, 游舜雄
• Other Authors: Shi-kun Chen
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/99731228257262165536

碩士 === 逢甲大學 === 材料科學所 === 99 === Cathode performance of carbon-coated metal bipolar plates for polymer electrolyte membrane fuel cells (PEMFC) has been investigated. The carbon film was deposited on AISI 304 stainless steel by chemical vapor deposition (CVD). The i-V curves and electrochemical impedance spectroscopy (EIS) of carbon-coated bipolar plates in PEMFC were studied under various conditions, such as the flow rates of reaction gases (200 to 1000 sccm H2 and 400 to 2000 sccm air) and the humidification temperatures (ranging from 25 to 80oC). The efficiency-current density of carbon-coated bipolar plates is demonstrated to be higher (120%) than that of metal bipolar plates. And the results of EIS indicate that using carbon-coated bipolar plate can reduce ohm and electrochemical impedances in fuel cell as compared with metal bipolar plates. After testing, the surface morphology of samples was observed using optical microscope. It is noticed that the corrosion area is reduced on carbon-coated bipolar plates. The content of impurities on MEA cathode examined by energy-dispersive spectroscopy show that the metal content is less as using carbon-coated bipolar plates. In PEMFC both the current density and the electrochemical resistance can be improved by using carbon-coated bipolar plates instead of metal bipolar plates. This composite plate has the potential to replace the commercial graphite bipolar plate.