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Figure 9. MXene-based DEG. (A) Schematic illustration of setup for generating electricity via sliding droplet on the graphene. (B) Schematic diagram showing the potential difference along the droplet sliding. Reproduced with the permission of Ref.^[119] Copyright © 2014 Springer Nature. (C) Photograph showing the MXene film attached to the glass substrate to form the DEG device. (D) V_oc and (E) I_sc generated by droplets sliding (4 cm s^-1) on the MXene film with a height of 15 cm. Reproduced with the permission of Ref.^[120] Copyright © 2022 American Chemical Society. (F) EDL effect formed between water and surface of TiO₂ and oxygen vacancy-rich Ti₂O_2n-1. (G) Long-term DEG performance test with droplet sliding speed of 14 mL min^-1. Reproduced with the permission of Ref.^[122] Copyright © 2021 American Chemical Society.