Fig. 6. CV profiles of (a) polysulfide@TFPPy–ETTA–COF and (b) S@TFPPy–ETTA–COF at different scanning rates. (c) Li⁺ ion diffusion coefficients of polysulfide@TFPPy–ETTA–COF (red) and S@TFPPy–ETTA–COF (blue). The plots of current versus square root of the scanning rate of the (d) anodic peak (A1), (e) cathodic peak C1, and (f) cathodic peak C2 for polysulfide@TFPPy–ETTA–COF (red) and S@TFPPy–ETTA–COF (blue).