(EN) A catalyst for an air electrode of a metal air secondary battery, which contains Ca2FeCoO5 and YBaCo4O7, wherein the mass ratio of the content of YBaCo4O7 to the content of Ca2FeCoO5 is from 0.49 to 9.00.
(ZH) 一种催化剂,其为金属空气二次电池的空气极用催化剂,所述催化剂包含Ca2FeCoO5及YBaCo4O7,YBaCo4O7的含量相对于Ca2FeCoO5的含量的质量比为0.49~9.00。