Abstract: A fuel cell power source is provided with a means for feeding a liquid fuel cell and water through time-sharing with the use of a single pump so as to maintain concentration of the liquid fuel, thereby it is possible to decrease the number of accessories in order to reduce the size of the fuel cell power source and as well to reduce the costs.

Abstract: It is an object of this invention to provide a high-performance membrane electrode assembly high in adhesiveness to proton-conductive aromatic polymer membrane, low in interfacial resistance and high in voltage-current performance, and a fuel cell using the same. This invention consists in a membrane electrode assembly equipped with an anode electrode having a catalyst layer on one side surface of a proton-conductive aromatic polymer membrane and a cathode electrode on the other side surface of the membrane, wherein said catalyst layer has a catalyst and a n-conjugated aromatic polymer having ion exchanging groups on side chains thereof.

Abstract: Disclosure is concerned with a small type fuel cell for a power source of portable electronic appliances, particularly to a fuel cell using liquid fuel such as methanol etc., an electronic appliance, and a method of doing business. The fuel cell characterized by having a circulating container for supplying liquid fuel of a predetermined concentration to the fuel cell and for recovering and storing the liquid fuel discharged from the fuel cell, wherein the circulating container is replaceable.

Abstract: There are the primary fuel nozzle for jetting the first coal in the fine powder form with an air ratio up to 1, and the secondary fuel nozzle for jetting the second coal in the fine powder form with an air ratio at least 1 from the outer circumferential portion of the primary fuel nozzle. Swirl means are located at the top of the secondary fuel nozzle for swirling the second coal.