fig3

Figure 3. Schematic of proposed reversible electrochemical redox mechanism of (A) NTCDA^[29], Reproduced from Ref.^[29]with permission from John Wiley and Sons. (B) 2,9-DMQA^[30], Reproduced from Ref.^[30] with permission from Elsevier. (C) PTCDA and NaPTCDA^[31]. Reproduced from Ref.^[31] with permission from Royal Society of Chemistry.