re: Direct Ethanol Fuel Cell
From your link:
The cell can be taken apart to expose the electrodes and membrane. It can then be re-assembled again. Performance may drop if the membrane is allowed to dry. Alcohol oxidation and CO2 formation, bubbling through the fuel in the tank, can be observed through the clear Plexiglas disk.
"bubbling CO2?" Dang. On the other hand, if the ethanol is from a plant source, the CO2 doesn't "count" as adding excess to the carbon cycle.