fig21

Figure 21. (A) Characterization of CoFe-ZIF@GO-10 and S-Co_9-xFe_xS₈@rGO-10: (A-1) SEM image of CoFe-ZIF, (A-2) TEM image of CoFe-ZIF@GO-10, and (A-3) TEM image of S-Co_9-xFe_xS₈@rGO-10; LSV curves of (B) OER, (C) ORR, (D) the overall polarization in ORR and OER region, and (E) the ΔE of S-Co_9-xFe_xS₈@rGO-10 (I), M-Co_9-xFe_xS₈@rGO-10 (II), Co,Fe-N-C@rGO-10 (III), Co_9-xFe_xS₈@rGO-10 (IV), Pt/C (V), and IrO₂ (VI) in 0.1 m KOH. Reproduced with permission. Copyright 2018, Wiley Online Library^[293]; (F) Characterization of FeNiP@C-200: (F-1) SEM, (F-2) TEM and (F-3) HRTEM images; (G) LSV curves of various catalysts at 1,600 rpm; (H) OER polarization curves of various catalysts at 1,600 rpm tested in 1 M KOH solution with a scan rate of 10 mV·s^-1; (I) OER-ORR polarization curves tested in 0.1 M KOH solution; (J) ΔE (OER_j=10 - ORR_E=1/2) in 0.1 M KOH solution. Reproduced with permission. Copyright 2021, Royal Society of Chemistry^[189].