fig9

Figure 9. (A) Coordination number (CN) distribution of Ni/Pt and P within amorphous PtNiP. The average CN values for Ni/Pt and P are determined to be 11.5 and 8.7, respectively; (B) Polarization curves comparing PtNiP ANPs, PtNi CNPs, and commercial Pt/C recorded at the first cycle and after the 10,000th CV cycle. Figure 9A and B is reprinted with permission^[112]. Copyright 2025, American Chemical Society. (C) Nyquist plots of the electrodes; (D) HER performance on pristine NiCo₂O₄ (311) and defective NiCo₂O₄ (311)-SV_O1; (E) LSV curves recorded for Co₃O₄-CC, NiCo₂O₄-CC, and NiCo₂O₄-B-CC for HER in 1 m KOH; (F) Tafel plots of Co₃O₄-CC, NiCo₂O₄-CC and NiCo₂O₄-B-CC toward HER in 1 m KOH. Figure 9C-F is reprinted with permission^[49]. Copyright 2024, John Wiley and Sons; (G) First-shell fitting result derived from the Pt L₃-edge EXAFS spectra and the corresponding Re[k²χ(k)] oscillations of Pt/TiB_xO_y; (H) Mass activity of Pt/TiB_xO_y and Pt/C evaluated at various potentials. Figure 9G and H is reprinted with permission^[51]. Copyright 2022, American Chemical Society; (I) Binding energie variations for Pt/a-Ni(OH)₂ catalysts as a function of electrodeposition time. Reprinted from^[52], under CC BY 4.0 license. RHE: Reversible hydrogen electrode; ANP: amorphous nanoparticle; CNP: crystalline nanoparticles; CC: carbon cloth; HER: hydrogen evolution reaction; LSV: linear sweep voltammetry; EXAFS: extended X-ray absorption fine structure.