Abstract
• A MOFs-derived bifunctional oxygen electrocatalyst was prepared. • The electron transfer from Ru to Co/Fe could improve the OER performance. • The porous carbon structure caused by Zn evaporation could promote both the ORR and OER activity. • A quasi in-situ electrochemical test in the battery cell was used to observe the surface passivation of transition metal nanoparticles. Prolonging the lifespan of oxygen catalysts in Zn-air batteries was urgently required for the potential commercialization. Herein, two interactional active species were integrated into porous N-doped carbon microspheres (Co-Fe-Ru/PNCS) to act as bifunctional oxygen electrocatalysts. Due to the electron transfer from Ru to Co/Fe element, the high value state of Ru could promote OER performance and reduce the charge voltage of the battery. An extended cycle stability of 200 h was achieved in Co-Fe-Ru/PNCS-based battery. Moreover, the quasi in-situ potentiodynamic sweep of air-electrode in battery cell confirmed it was the incorporation of Ru that avoided the passivation of Co/Fe-based nanoparticles. Accordingly, this novel electrocatalyst may provide a new strategy of designing durable bifunctional oxygen electrocatalyst for Zn-air batteries.
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