fig4

Figure 4. Electrochemical performances of HATN-COF electrode. (A) CV profiles at varying scan rates; (B) GCD profiles at various current densities; (C) Rate capability performance and coulomb efficiency; (D) Nyquist plots, an inset showing enlarged portion; (E) Cycling performance at 6 A g^-1. The inset provides the GCD profiles for both the initial and the final five cycles. HATN: Hexaazatrinaphthylene; COF: Covalent organic frameworks; CV: Cyclic voltammograms; GCD: Galvanostatic charge-discharge.