fig4

Figure 4. (A) The types of MXene that have been synthesized. Reproduced with permission from Ref.^[36]. Copyright 2021 American Chemical Society. The schematic diagram of MXene is obtained by etching the MAX phase with (B) HF acid, Reproduced with permission from Ref.^[18]. Copyright 2011 Wiley-VCH. (C) HCl/LiF, Reproduced with permission from Ref.^[37]. Copyright 2014 Springer Nature. (D) NH₄HF₂ Reproduced with permission from Ref.^[38]. Copyright 2020 Elsevier. and (E) Lewis molten salt. Reproduced with permission from Ref.^[39]. Copyright 2020 Springer Nature. (F) Schematic diagram of Mo₂TiC₂ obtained by electrochemical etching of Mo₂TiAlC₂. Reproduced with permission from Ref.^[41]. Copyright 2022 Wiley-VCH. (G) Schematic diagram of Ti₂CT_x obtained by electrochemical etching of Ti₂AlC. Reproduced with permission from Ref.^[42]. Copyright 2023 Wiley-VCH. (H) The synthesis roadmap of MXene was obtained by solid-state method. (I) Schematic diagram of MXene synthesis by CVD. Reproduced with permission from Ref.^[45]. Copyright 2023 American Association for the Advancement of Science.