fig8

Figure 8. (A) SEM image of NG-C; (B) low-magnification TEM image and selected area electron diffraction (SAED) pattern (inset) of NG-C; (C) LSV curves of ORR on NG-M, NG-T, NG-C, and commercial Pt/C; (D) ORR forward peak maximum currents for NG-C and commercial 20 wt% Pt/C catalysts after different cycles. Reproduced with permission. Copyright 2015, ACS Publications^[107]; (E) Schematic diagram of the synthesis of the pore size-enlarged NPC nanomaterials derived from ZIF-8 precursors; (F) Linear sweep voltammograms of ZIF-8-derived NPC nanomaterial, KOH-activated ZIF-8-derived NPC nanomaterials and Pt/C (20%) in O₂-saturated 0.1 M KOH solution at a scan rate of 10 mV·s^-1 with 1,600 rpm; (G) LSV curves of NPC-4 with various rotation speeds, with the inset giving the K-L plots. Reproduced with permission. Copyright 2019, ACS Publications^[110].