fig8

Figure 8. (A) Preparation procedure of COF/rGO-Ru, (B) LSV curves of COF, COF/rGO, COF-Ru, COF/rGO-Ru, and commercial Pt/C. Copyright 2019, American Chemical Society^[111]. (C) LSV plot of Ru@COF, bare RuCl₃, and COF. (D) Tafel plot of Ru@COF, COF, RuCl₃, and bare GC. (E) Nyquist plot of impedance spectra of bare GC, COF, and Ru@COF at onset overpotential of 159 mV. Inset: impedance spectra in a lower frequency range. Copyright 2020, John Wiley and Sons^[112]. TEM images of (F) Cryst-2D-PMPI. Copyright 2023 ELSEVIER. Copyright 2021, ELSEVIER^[113]. (G) Longtime stability of Mo₂C-MoNi₄@NC-2 at current densities of 10, 20, 50, 100, 50, 20, and 10 mA cm-² (each step was set as 20,000 s). Copyright 2023, Elsevier^[114].