fig4

Figure 4. (A) Schematic illustration of the synthesis process of the NiCo₂O₄-B-CC; (B) HRTEM images of NiCo₂O₄-CC. Figure 4A and B is reprinted with permission from^[49]. Copyright 2024, John Wiley and Sons; (C) Schematic illustration showing the synthesis of typical Ni-FeNi₃/Ni_0.5-bFe_0.5-yMo_1.5O_x nanohybrids; (D) High-magnification TEM image; (E and F) HRTEM images of Ni-FeNi₃/Ni_0.5-bFe_0.5-yMo_1.5O_x. Figure 4C-F is reprinted with permission from^[75]. Copyright 2023, John Wiley and Sons. BTBC: Borane-tert-butylamine complex; CC: carbon cloth; HRTEM: high-resolution transmission electron microscopy.