Adjusted MnO oxygen vacancy for highly selective ORR production of H 2 O 2 .

The oxygen reduction reaction (ORR) via the two-electron pathway is an important method of hydrogen peroxide (H 2 O 2 ) production. This study demonstrates that MnO with different oxygen vacancies possesses great 2e - ORR activity. The H 2 O 2 selectivity increased from 10% to 93% with increasing oxygen vacancy concentration by adjusting the reaction temperature and time. Moreover, the H 2 O 2 yield of the optimal MnO reached 544.1 mmol g -1 h -1 , and it showed extraordinary stability over a long period of time (10 000 circles CV), surpassing most of the reported transition metal catalysts. This provides a new strategy for efficient and low-cost electrochemical production of H 2 O 2 .