Interface interaction of Ag-CeO2-Co3O4 facilitate ORR/OER activity for Zn-air battery

Developing a highly stable and high-efficiency catalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is critical to developing Zinc-air battery. In this work, a facile strategy was applied to prepared Ag-CeO 2 -Co 3 O 4 /C dual-functional catalyst. The interface interaction affecting the electronic structure and valence state of Ag, Ce and Co, significantly facilitates the ORR/OER catalytic activity. For the Ag-CeO 2 -Co 3 O 4 /C catalyst, the half-wave potential is 0.80 V and limiting current density is 6.2 mA cm −2 in ORR, while the overpotential is 340 mV s −1 at 10 mA cm −2 in OER. The maximum power density in Zn-air battery is 178 mW cm −2 at 300 mA cm −2 . The relationship between interface interaction and catalytic activity provides guidance for developing multiple catalysts. Graphical abstract. .