fig4

Figure 4. Electrochemical characterization and structural evolution of the PTCDI electrode. (A) GCD curve and corresponding ex-situ XRD patterns recorded at selected states to elucidate the energy storage mechanism. (A) Reprinted with permission from Ref.^[29]. Copyright © 2025 Wiley; (B) GCD profiles and (C) Rate capability of the PTCDI electrode obtained at various current densities. (D) Long-term cycling performance and stability of the PTCDI electrode at a specific current of 0.5 A/g. (B-D) Reprinted with permission from Ref.^[27]. Copyright © 2025 American Chemical Society. XRD: X-ray diffraction; PTCDI: perylene-3,4,9,10-tetracarboxylic diimide; GCD: galvanostatic charge-discharge.