PHOSPHORIC ACID FUEL CELL, MANUFACTURE AND MAINTENANCE THEREOF

摘要

PROBLEM TO BE SOLVED: To reduce the attaching amount of impurities to the surface of an electrode attendant on continuous operation. SOLUTION: After the operation of a phosphoric acid fuel cell is stopped, air or pure oxygen gas which are oxidizing gas is passed to the surface of an anode. Fuel gas is passed to a cathode, and power is generated with the function of both electrodes replaced. Load current density is increased as large as possible, such as 200mA/cm2 , and load applying time is shortened, and this operation is repeated. By applying a load at large current in short time in pulse as maintenance job, anodic activation is realized, the oxidation on the surface of the anode and the reduction on the surface of the cathode are accelerated, and both electrodes are cleaned.