fig7

Figure 7. (A) Polarization curves and the corresponding Tafel plots of CeO₂-NiCoP, NiCoP and commercial Pt/C catalysts. This figure is quoted with permission from Yu et al.^[86]. (B) XRD pattern of Fe₂P-CoP/CeO₂-20; (C) LSV curves of Fe₂P-CoP/CeO₂; (D) ΔG_H* profiles a on CoP, Fe₂P, Fe₂P-CoP, and Fe₂P-CoP/CeO₂. This figure is quoted with permission from Ding et al.^[87]; (E) SEM image; (F) Illustration of the HER mechanism on Y, Co-CeO₂. This figure is quoted with permission from Liu et al.^[89]; (G) HER performance examined in 1.0 M KOH of CeO₂-I, CeO₂-II, and CeO₂-III. This figure is quoted with permission from Liu et al.^[90]; (H) DF-TEM image of Ce-doped CoP, and element mapping images of Co, Ce and P, respectively; (I) Polarization curves (with iR corrections) of CoP, Ce-doped CoP and Pt/C catalysts with a scan rate of 5 mV/s in 0.5 M H₂SO₄. This figure is quoted with permission from Gao et al.^[91]. RHE: Reversible hydrogen electrode; XRD: X-ray diffraction; LSV: linear sweep voltammetry; SEM: scanning electron microscopy; LSV: linear sweep voltammetry; iR: internal resistance; DF-TEM: dark-field transmission electron microscopy.