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Figure 8. (A) Geometries of Ni(OH)2; blue, pink, and white spheres represent Ni, O, and H atoms, respectively. (B) TEM image of Ni(OH)2/CNT; under high resolution, the lattice fringes show a planar spacing of 0.236 nm, which can be ascribed to the (101) facet of Ni(OH)2. (C) WT of the Ni K3-weighted EXAFS signals of Ni(OH)2/CNT. (D) LSV polarization curves of Ni(OH)2/CNT in NaCl solutions with different concentrations and Faradaic efficiency of Ni(OH)2/CNT in 1 M NaCl. (A-D) is reprinted with permission from Ref.[171]. Copyright © 2025 Springer Nature. (E) Top view of BDC ligand-functionalized Ni(OH)2; pink, red and green spheres represent H, O and Ni atoms, respectively. (F) HRTEM image of PR-utn-NiBDC. (G) WT of the k3-weighted Ni K-edge EXAFS signals of utn-NiBDC. (H) Polarization curves of utn-NiBDC, utn-Ni(OH)2, and XC-72 recorded at 1,600 rpm and a scan rate of 5 mV s-1, together with the detected HO2- currents on the ring electrode at a fixed potential of 1.2 V vs. RHE. (E-H) is reprinted with permission from Ref.[172]. Copyright © 2025 Springer Nature. (I) Co-SCD-2 models; azure, yellow, red, gray, and light pink spheres represent Co, S, O, C, and H atoms, respectively. (J) HAADF-STEM image of Co-SCD-2 after the test. (K) LSV polarization curves of Co-SCD-1, Co-SCD-2, and Co-SCD-3. (L) Tafel slope curves of Co-SCD-1, Co-SCD-2, and Co-SCD-3. (I-L) is reprinted with permission from Ref.[173]. Copyright © 2023 Wiley-VCH GmbH. (M) Schematic illustration of deficient [NiO6]-[InO6] motifs of NiOOH/In(OH)3 heterostructures for E-NiIn and C-NiIn. (N) High-resolution STEM image. (O) Free-energy diagram for the two-electron oxygen reduction reaction on C-NiIn-Ov and E-NiIn-Ov at U = 0 V; inset: configuration of HOO* adsorbed on E-NiIn. (P) Oxygen reduction reaction LSV curves of E-NiIn and C-NiIn measured by RRDE. (M-P) is reprinted with permission from Ref.[174]. Copyright © 2024 Wiley-VCH GmbH.
