Water Evaporation Triggered Self?Assembly of MXene on Non?Carbonized Wood with Well?Aligned Channels as Size?Customizable Free?Standing Electrode for Supercapacitors

Herein, non-carbonized wood-based electrodes and separators with well-aligned channels excellent mechanical properties are developed for supercapacitors. To enhance the conductivity boost capacitance, Ti3C2 (MXene) nanosheets high electrical electrochemical activity loaded into wood cells via self-assembly triggered by fast evaporating water in suspension. By assistance of positive charged polydopamine microspheres large surface area, self-restacking can be avoided mass loading (50 wt%) achieved due to extra driving force absorption. Benefiting from conductive massive active sites multiple efficient transportation pathways charge carriers, as-designed free-standing electrode shows a areal capacitance 1060 mF cm?2 at 0.5 mA retention 67% 10 cm?2. Also, this is highly size-customizable, showing good ability industrially processed various shapes dimensions. Furthermore, an all-wood based supercapacitor Ti3C2/wood composites as two layers slice separator fabricated, presenting energy density 10.5 ?W h 389.9