fig6

Figure 6. (A) Synthetic protocol for Co-BM-C. This figure is quoted with permission from Jin et al.^[70]; (B) Schematic illustration of the synthesis procedure of Co@MXenes inspired by the iced photochemical reduction method. This figure is quoted with permission from Zhao et al.^[71]; (C) Synthesis strategy of NiSA/PCFM. This figure is quoted with permission from Yang et al.^[72]; (D) Schematic illustration showing the synthesis of Fe SACs. This figure is quoted with permission from Wang et al.^[39]. SACs: Single-atom catalysts; NiSA/PCFM: Single-atom nickel-decorated porous carbon membrane catalyst.