Abstract: Purification of hydrogen is realized in an assembly comprising anode and cathode gas diffusion electrodes, an electrolyte situated between the electrodes, first and second gas passages adjacent the electrodes and means for applying a voltage across the electrodes.

Abstract: A vaporizer for converting liquid fuel into fuel vapor wherein an annular chamber defined by inner and outer walls is provided and wherein rings are situated one after the other along the length of the chamber, each ring extending around the circumference of the chamber in contact with the inner and outer walls and including a passageway for conveying fluid and/or vapor between the liquid/vapor flow spaces situated on opposite sides of the ring.

Abstract: A fuel cell system employing a reformer for developing a fuel process gas from a hydrocarbon fuel-water mixture wherein the mixture is generated by exclusively delivering a water miscible hydrocarbon fuel to a mixing tank when the level of constituents in the mixing tank falls below a first predetermined level, ceasing delivery of the fuel and initiating exclusive delivery of water to the mixing tank when the level of constituents in the mixing tank rises to a second predetermined level, ceasing delivery of water when the constituents in the mixing tank rise to a third predetermined level, with the level in the mixing tank at the third predetermined level, delivering the hydrocarbon fuel-water mixture to a holding tank when the hydrocarbon fuel-water mixture in the holding tank falls below a first predetermined position, and ceasing delivery of the mixture to the holding tank when the level of constituents in the mixing tank falls below said first predetermined level.