fig4

Figure 4. (A) Morphology of composite sulfur electrode and corresponding EDS mapping; (B) Optimized polysulfide adsorption structures and calculated binding energy. The figures are quoted with permission from Tian et al.^[91]; (C) HRTEM images of YF₃ nanofiber and corresponding EDS mapping; (D) Optimized YF₃ structure. The figures are quoted with permission from Hao et al.^[92]; (E) Preparation process of CoF₃co-doping into YF₃ carbon nanofiber and corresponding morphologies. This figure is quoted with permission from Wang et al.^[93]; (F) HRTEM image of Hollow- CeF₃ and corresponding EDS mapping; (G) Optimized polysulfide adsorption structures on the surface of CeF₃ and CeO₂; (H) Adsorption energy comparison between CeF₃ and CeO₂. The figures are quoted with permission from Liu et al.^[94]. PVP: Polyvinyl pyrrolidone; PTFE: polytetrafluoroethylene; EDS: energy-dispersive X-ray spectroscopy; HRTEM: high-resolution transmission electron microscopy.