Abstract
The oxygen reduction reaction (ORR) via the two-electron pathway is an important method of hydrogen peroxide (H2O2) production. This study demonstrates that MnO with different oxygen vacancies possesses great 2e- ORR activity. The H2O2 selectivity increased from 10% to 93% with increasing oxygen vacancy concentration by adjusting the reaction temperature and time. Moreover, the H2O2 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 H2O2.
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