Abstract
A high efficient passive micro fuel cell is disclosed. The fuel cell comprises an anode plate, a reaction plate, a cathode plate, and an evaporation plate. The anode plate uses capillarity to pump diluted CH3OH solution from a fuel tank to a micro transportation channel. Through the micro transportation channel, the diluted CH3OH solution is transported to several upper oxidation reaction chambers. The upper oxidation reaction chamber can lead the CO2 and H2O (vapor) formed by the oxidation reaction from the structure of the uneven cross-section of a lower (or upper) oxidation reaction hole through several gas vents to the upper evaporation plate. The CO2 and H2O (vapor) can be separated by condensation, the gradient of surface tension, and capillarity. The fuel cell can efficiently emit CO2 to the atmosphere and collect the condensed water drops into a wastewater tank. At the same time, the diluted CH3OH solution can be transported to the lower oxidation reaction chambers on the reaction plate. There are nanometer carbon tubes and a catalyst attached on the inner surface of the reaction hole in the lower oxidation reaction chamber to accelerate the reaction. The proton formed by the oxidation reaction can penetrate the surface of the reaction hole and the porous film layer within the reaction plate, and arrive at an upper reduction reaction chamber. Similarly, there are nanometer carbon tubes and a catalyst attached on the inner surface of the reaction hole of the upper reduction reaction chamber to catalyze and reduce the proton to water. The cathode plate also has lower reduction reaction chambers that can immediately transport the required oxygen of the reduction reaction to the upper reduction reaction chamber and vent the reduced water to a micro vent channel.