fig16

Figure 16. (A) TEM image of 2D MOF-Fe/Co; (B and C) Electrochemical performances of the MOF-Fe/Co with various shapes on OER. (B) iR-corrected polarization curves and (C) corresponding Tafel plots derived from the LSV curves^[119]. Copyright 2021, Wiley-VCH; (D and E) TEM image of (D) H-ZIF-8[2S] and (E) H-ZIF-8[5S]; (F) Gravimetric discharge and charge curves of H-ZIF-8[1S] and ZIF-8 at a current density of 50 mA·g^-1 with a cutoff capacity of 1,000 mAh·g^-1; (G) Geometric discharge and charge curves of H-ZIF-8[1S] and H-ZIF-8[5S] at a constant current of 0.1 mA·cm^-2 with a cutoff capacity of 0.5 mAh·cm^-2; (H) Full geometric discharge curves at a constant current density of 0.1 mA·cm^-2; (I) Comparison plot of capacity and overpotential according to mass loading^[120]. Copyright 2020, Wiley-VCH; (J) SEM and (K) TEM images of Mn/Fe-HIB-MOF; (L) ORR and (M) OER polarization profiles of the different catalysts; (N) Discharging and power density profiles for primary ZABs for the M-HIB-MOFs; (O) Discharge plots of ZABs for Mn/Fe-HIB-MOF air cathodes for distinct current densities^[121]. Copyright 2019, Royal Society of Chemistry. Scale bars: (D) 50 nm and (E) 50 nm. TEM: Transmission electron microscopy; 2D: two-dimensional; MOF: metal–organic framework; OER: oxygen evolution reaction; LSV: linear sweep voltammetry; ZIF: zeolitic imidazolate framework; SEM: scanning electron microscopy; ORR: oxygen reduction reaction; ZAB: Zn–air battery.