Abstract:

La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ (LSCF) and La_0.8Sr_0.2MnO_3-δ (LSM) cathode materials were prepared by co\|precipitation method in the OH- solution. The properties of LSCF and LSM powders were characterized by XRD, BET and FESEM. The results show  that  LSCF and LSM precursors can be transformed to the pure orthorhombic perovskite structure having been  calcined at 900 ℃ and 1 200 ℃ for 5 h, respectively, and  LSCF cathode has a smaller particle  size and a bigger specific surface area compared with  LSM cathode. The investigation of electrochemical properties show that LSCF cathode has lower over\|potential compared with  LSM cathode, which reveals that the electrode activity of  LSCF cathode is better than that of  LSM cathode. The V-I characteristics of single cell show  that the cell with LSCF cathode has a better performance than LSM cathode.

Key words: cathode, cathode materials LSCF, cathode materials LSM; , overpotential