Figure4. (A)Preparation process of BC/CNT paper-based electrode modified by juglone. (B)The mechanism of electrical transfer of juglone auxiliary electrons on CNT. [72] (C)Flow chart of cellulose/f-CNT paper-based electrode and loaded MnO2.[73] (D)GQD preparation process. (E)CNF/GQD paper based electrode preparation process. (F)TEM image of CNF/GQD. [77]