2.4.2 Pouring molding
Due to its high specific surface area, excellent hydrophilicity and excellent rigid structure, cellulose is widely used in self-assembly film forming technology. In the field of flexible paper-based supercapacitors, scientists have also tried to blend the active material with cellulose and then prepare paper-based electrodes by pouring them in a mold by using the electrostatic layer self-assembly method. For example, Garino et al. [122] poured rGO/SnO2synthesized by hydrothermal method with microfibrimmated cellulose (MFC) blend in a PP mold. Self-assembled paper-based electrodes were then obtained after holding in air for 24 h to remove solvent moisture. Figure 15A shows an SEM image of a paper-based electrode. It is clear from the figure that MFC and rGO/SnO2 tablets are perfectly combined. This is very important for the mechanical properties of the composite electrode. Edberg et al. [123] also prepared a cellulose-based paper-based electrode based on PEDOT by pouring molding in a mold. After testing, the paper-based electrode assembled energy storage device exhibits a specific capacitance of more than 400F g-1, showing very excellent energy storage characteristics.