fig3

Figure 3. (A) OER curves, (B) Tafel slopes, (C) ORR curves, (D) RDE curves at 400-1600 rpm (insert: K-L plots), € EIS curves, and (F) potential gap (ΔE) of ORR and OER for Pt/C-RuO₂, NiCo₂O₄-CNTs, NiCo₂O₄/MnO₂-CNTs, Co₃O₄@MnO₂/CNTs-Ni foam, and NiCo₂O₄@MnO₂/CNTs-Ni foam. (G) Schematic reaction mechanism of ORR and OER electrocatalyzed by NiCo₂O₄@MnO₂/CNTs-Ni foam.