fig7

Figure 7. (A and B) XPS spectra of Pt 4f region for Pt NWs, PtRu NWs, PtFe NWs, PtCo NWs, PtCu NWs, and PtAu NWs; (C) Bar graph highlighting experimental HOR exchange current densities as a function of the calculated surface HBE values for models of “near-surface alloys”. Reproduced with permission from^[29]. Copyright 2016, American Chemical Society. (D) Partial density of states of the Ru d-band for Ru, Ru₇Co₁, Ru₃Co₁, and RuCo. The Ru d-band centers are indicted in the figure. Reproduced with permission from^[175]. Copyright 2020, American Chemical Society. (E) Relationship between the HOR-specific activity and the Ru/Ir surface composition, where the Ru-Ir, Ru-Ru, and Ir-Ir pairs are colored in blue, green, and yellow, respectively. Reproduced with permission from^[177]. Copyright 2020, American Chemical Society. (F) Free energy diagrams of the elementary processes of HOR on Ru and RuNi1, including atomic configurations of each state on various metal surfaces. Color: orange, Ru; green, Ni; red, O; white, H. Reproduced with permission from^[185]. Copyright 2020, American Chemical Society. (G) The optimized structure and aberration-corrected HAADF-STEM images of Pt₁-Rh NSs, Pt₂-Rh NSs, and Pt_c-Rh NSs; (H) HOR mass activities and specific activities in 0.1 M KOH electrolyte; (I) Plot of RDS free energy (ΔG_RDS) scaling with ΔG_H and ΔG_OH on Pt₁-Rh(111) (blue), Pt₂-Rh(111) (red), Pt_c -Rh(111) (green), and Pt(111) (black) surfaces. Reproduced with permission from^[186]. Copyright 2023, American Chemical Society.