fig8

From: Multi-functional engineering of rare earth-based catalysts for high-efficiency water splitting

Figure 8. (A) TEM images of the Er-doped CoP nanomesh; (B) Polarization curves of bare CC, CoP, Er-doped CoP and Pt/C in 1.0 M KOH; (C) XPS full spectra of CoP and Er-doped CoP, respectively. This figure is quoted with permission from Zhang et al.^[94]; (D) LSV polarization curves of Er-NiCoP/NF, NiCoP/NF, bare NF, and commercial Pt/C for HER; (E) Calculated free-energy diagram of NiCoP and Er-NiCoP for HER; (F) XPS analysis of survey scan and high resolution. This figure is quoted with permission from Zhang et al.^[95]. (G) Aberration-corrected (AC) HAADF-STEM image of Pt-Er/h-NC; (H) Polarization curves of Pt-Er/h-NC and the references; (I) The theoretical volcano of HER on Pt atoms of various Pt-based catalysts. This figure is quoted with permission from Chen et al.^[97]. RHE: Reversible hydrogen electrode; TEM: transmission electron microscopy; XPS: X-ray photoelectron spectroscopy; LSV: linear sweep voltammetry; NF: nickel foam; HER: hydrogen evolution reaction; HAADF-STEM: high-angle annular dark-field scanning transmission electron microscopy; NC: nitrogen-doped carbon.