Adjusted MnO oxygen vacancy for highly selective ORR production of HO.

The oxygen reduction reaction (ORR) the two-electron pathway is an important method of hydrogen peroxide (HO) production. This study demonstrates that MnO with different oxygen vacancies possesses great 2e ORR activity. The HO selectivity increased from 10% to 93% with increasing oxygen vacancy concentration by adjusting the reaction temperature and time. Moreover, the HO yield of the optimal MnO reached 544.1 mmol g h, 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 HO.