fig4

Figure 4. Schematic for the synthesis route of (A) Sb@NPC and its cyclability. Reprinted with permission from Ref.^[47]. Copyright 2022, Elsevier. (B) Bi@C-600, Bi@C-920, and Bi@C-1000 with corresponding SEM images. Reprinted with permission from Ref.^[55]. Copyright 2020, Elsevier. (C) TEM images with the particle size distribution of Sn/N-CNFs-1/5/20/120 and their electrochemical performance. Reproduced from Ref.^[38] with permission from the Royal Society of Chemistry. (D) Schematic diagram of the preparation process of Sb@PCNFs with SEM and TEM images and digital photos of Sb@PCNFs at different states. Reprinted with permission from Ref.^[40]. Copyright 2022, Elsevier.