2.1.6 Cellulose/PANi paper based composite electrode
Polyaniline is a kind of conductive polymer material with excellent pseudo capacitance energy storage performance. However, when it is used as electrode material of supercapacitor, serious volume shrinkage and expansion will occur, resulting in obvious brittleness of pure polyaniline electrode material. As a 1D material with excellent mechanical properties, cellulose and polyaniline can compensate for the brittleness of polyaniline, and polyaniline provides excellent conductivity and energy storage properties. Sun et al. [84] first introduced RGO into polyaniline polymerization to obtain PANi/RGO composites. Then the cellulose/PANi/RGO paper based composite electrode material was prepared by vacuum filtration of cellulose and the composite material. Among them, the energy storage performance of the paper-based electrode was significantly improved due to the addition of RGO (the specific capacitance was 79.71F g-1). Although the specific capacitance value of the electrode is not as good as that of the paper-based electrical base. However, as an excellent pseudo capacitive electrode material, conducting polymers should be tried to construct structures conducive to improving electrochemical performance through vacuum filtration in future research. Cellulose and other conductive polymer materials are used to prepare cellulose/conductive polymer paper based electrode with more excellent performance through vacuum filtration.
Based on the above discussion on the preparation of paper based electrode materials by vacuum filtration. Due to the simple preparation, strong controllability and similar to papermaking process, scientists have also prepared a variety of paper-based electrical materials through this process. Table 1 compares the main parameters of paper based electrodes prepared by vacuum filtration. It is obvious from the classification in the table that the process is still mainly focused on the composite between cellulose and carbon materials and MXene, and there is still a lack of research on the relationship between cellulose and conductive polymers and metal oxides. For example, cellulose and nanowire metal oxides (such as MnO2) can also be used to prepare paper based electrode materials with excellent performance. Therefore, in future research on preparation of the paper based supercapacitor electrode materials by vacuum filtration. We can actively broaden our vision and combine more electrochemical active substances with cellulose through this simple preparation process to prepare cellulose paper based electrode materials with excellent performance. At the same time, in the era of rapid development of flexible electronics, we should also pay attention to the use of this process to achieve mass production. Among them, mature papermaking process should be the first choice. For example, Tang et al. [81]realized the batch production through the laboratory vacuum filtration results through the manufacturing process, which provides a mature guidance scheme for the production of cellulose paper based supercapacitors. In the 2.4.1 section, we will summarize the application of papermaking technology in cellulose paper based supercapacitors in detail.
Table1 Performance Parameters of Cellulose Paper Based Electrode Blended with Multi component Based on Vacuum Filtration