Method for improving medium and low temperature catalytic performance of cathode of solid oxide fuel cell

The invention discloses a method for improving low-temperature catalytic performance in a cathode of a solid oxide fuel cell. The method comprises the following steps: preparing praseodymium nitrate precursor impregnation liquid, and impregnating the praseodymium nitrate precursor impregnation liquid into the cathode of the solid oxide fuel cell (the cathode is a perovskite type material); carrying out the in-situ loading of praseodymium oxide catalyst particles on the surface of the cathode by means of the heating process of the front working section of the solid oxide fuel cell, so the catalytic performance of the cathode is remarkably improved, the polarization impedance is reduced, and the cell power is improved. The method does not need a high-temperature calcination link, has the advantages of few procedures, high speed, low energy consumption and simplicity and convenience in operation, and can greatly improve the performance of the solid oxide fuel cell. And the polarization impedance of the immersed