Abstract
A new flowfield design enabling fully passive CO 2 -gas bubble removal from the anode of a micro direct methanol fuel cell (µ DMFC) is presented. The flowfields channels have an upside down T-shaped cross-section with defined opening angles along their axis and cross-section. The angles create an intrinsic transport mechanism removing growing gas bubbles from the electrode by capillary forces only. Applicable opening angles α and β are 5 ° and 1.5 ° respectively. The experimental verification has been done based on a transparent flowfield and by a fully operational µ DMFC delivering a power density output of up to 8 mW/cm2without the need of external pumps. Although the fuel cell supply can be operated both passively and pump assisted, the passive operation shows the highest efficiency.
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