fig3

Figure 3. Working mechanism of MEGs and typical MEGs using MXenes as active materials. (A) Typical sandwich-type device structure of MEG. Reproduced with the permission from Ref.^[44] Copyright © 2023 Elsevier Ltd. (B) Schematic illustration showing the power-generation processes in a representative MEG. Reproduced with the permission from Ref.^[45] Copyright © 2023 Wiley-VCH. (C) Schematic illustration of the preparation of MC and SCS fabrics. (D) V_oc and I_sc curves of Al-MC-SCS MEG tested over 20,000 s. Reproduced with the permission from Ref.^[46] Copyright © 2023 Elsevier Ltd. (E and F) Schematic illustration showing the power-generation process of the MXene-based bilayer MEG (E), and corresponding V_oc output under different RHs (F). Reproduced with the permission from Ref.^[47] Copyright © 2023 American Chemical Society. (G and H) Schematic illustration and performance of MXene-based asymmetric MEG (G), and corresponding working mechanism (H). Reproduced with the permission from Ref.^[48] Copyright © 2021 American Chemical Society.