| 摘要 |
PROBLEM TO BE SOLVED: To efficiently permeate a phosphoric acid into catalyst layers in a short time, reduce the degradation of a catalyst, improve fuel cell performance, and lengthen the service life by permeating the phosphoric acid into the respective catalyst layers by using an electroendosmosis phenomenon. SOLUTION: A phosphoric acid is previously permeated into a matrix 1 and an air electrode base material 5, and cells are layered. In this condition, fuel gas containing hydrogen is supplied to a fuel gas flowing passage 7, and air is supplied to an air flowing passage 8, and operation is started. Then, a part wet with a phosphoric acid of a fuel electrode catalyst layer 2 and an air electrode catalyst layer 4 functions as a fuel cell, and generates voltage close to release voltage of the fuel cell. Then, terminal voltage V where an air electrode is set to a positive is controlled in about 700mV not more than corrosive electric potential of a carbon member by a voltage control device 9, and an electric current is flowed. Then, a phosphoric acid in an air electrode base material 5 permeates into the air electrode catalyst layer 4, and a phosphoric acid in the matrix 1 also permeates into the fuel electrode catalyst layer 2 by an electroendosmosis phenomenon, and it finally reaches electric current density of a practical level, and impregnation of the phosphoric acid into the respective catalyst layers is completed. |
