fig4

Figure 4. Electrochemical performances of CrO_x/NC, MnFeCoNi/NC, CrMnFeCoNi-(CrO_x)₁/NC, and benchmark catalysts in 0.1 M KOH: (A) ORR LSV curves recorded at 1600 rpm with scan rate of 5 mV s^-1; (B) ORR Tafel slopes; (C) ORR electron transfer numbers (n) and hydrogen peroxide yields (H₂O₂%); (D) OER LSV curves at scan rate of 1 mV s^-1; (E) OER Tafel slopes; (F) potential gap (ΔE) between η₁₀ of OER and E_1/2 of ORR. ORR: Oxygen reduction reaction; LSV: linear sweep voltammetry; OER: oxygen evolution reaction.