A simplified direct oxidation fuel cell system is provided. The fuel cell is constructed in such a manner that fuel is added to the cell anode as it is consumed and water is evaporated off at cell cathode so that there is no need for recirculation of unreacted fuel at the cell anode or water at the cell...http://www.google.com.au/patents/US7638215?utm_source=gb-gplus-sharePatent US7638215 - Method of controlling delivery of fuel to a direct oxidation fuel cell
