Usually, oxygen adsorption on a catalyst surface generally occurs in three configurations (see Figure ) : end-on Pauling-type (one oxygen atom coordinated to single site), side-on Griffiths-type (two oxygen atoms bonded to single site), and Yeager-type (two oxygen atoms bonded separately to two sites). Figures to Pauling-type, so it has better 2e -ORR selectivity. Subsequently, the conclusions drawn from the catalytic reaction path will be verified.