fig4

Figure 4. (A) Schematic illustration of the synthesis process of Ni/CeO₂@N-CNFs. (B) Schematic representation of the preparation of NiCuDSS electrocatalysts. (C-E) SEM images of prepared Ni_0.95Cu_0.05DSS at different magnifications. This figure is quoted with permission from Li et al.^[61] and Zhang et al.^[63].