fig5

Figure 5. (A) (a) TEM image of CuCo@N-C; (b) ORR and OER curves of CuCo@N-C, Co@N-C, Cu@N-C and N-C; (c) Charge-discharge curves of Pt/C and CuCo@N-C^[31]. Copyright 2019, the Royal Society of Chemistry. (B) (a) SEM image of Fe-N, O/G; (b) LSV tests curves of the ORR for the Fe-N,O/G and other electrocatalysts; (c) Discharge polarization curves and power densities^[37]. Copyright 2023, the Royal Society of Chemistry. (C) (a) HAADF-STEM image the Fe-SA-NSFC; (b) ORR polarization curves of the Fe-SA-NC, Fe-SA-NSC, Fe-SA-NSFC, and Pt/C; (c) Discharge polarization curves and power density curves^[40]. Copyright 2020, Springer Nature.