Figure 4.

a) Anodic polarization curves of 1−X (supported on a Pt microelectrode, diameter=25 μm), recorded in O₂‐saturated 0.1 m KOH at a scan rate of 5 mV s⁻¹. Temperature: 25 °C. All polarization curves are shown without iR drop compensation; b) Comparison of the current density of 1−NH₂, 1−H, 1−OCH₃ and 1−Br for the OER at 1.53 V vs. RHE (η=300 mV); c) Anodic polarization curves from ORR to OER regime on 1−NH₂ (supported on an Au disc electrode, diameter=5 mm) and blank Au electrodes in O₂‐saturated 0.1 m KOH at a scan rate of 10 mV s⁻¹ after 85 % iR‐compensation. Temperature: 25 °C. Rotation speed: 1600 rpm; ΔE refer to the difference between the potential required for an OER current density of 10 mA cm⁻² and the ORR half‐wave potential; d) polarization curve of 1−NH₂ (supported on an Au disc electrode) at various rotational speeds; e) Comparison of bifunctional activities of ORR and OER with literature data: 2: CoZn‐NC‐700,31 3:Co‐N‐CNTs,32 4: Co₃O₄‐N‐Carbon,33 5: NiCo₂S₄@g‐C₃N₄‐CNT,34 6: N‐GCNT/FeCo,35 7: NC@Co‐NGC,36 8: Co@Co₃O₄/NC,9a 9: Au, 10: Pt/C,9a 11: RuO₂,9a 12: IrO₂.9a