fig3

Figure 3. (A) Polysulfide permeation measurements for MXene-decorated and Au QDs@MXene-decorated separators during the course of polysulfides diffusion from the right side to the left side of the H-bottles. (B) UV-vis absorption spectra of Li₂S₆ solution on the left side of devices after 24 h. (C) Relationship between Q_high and current density of Li-S cells with the MXene-decorated and Au QDs@MXene-decorated separators. (D) CV curves of the MXene-based and Au QDs@MXene-based full cells at a scan rate of 0.1 mV s^-1. (E) Tafel plots corresponding to the reduction from Li₂S_x to Li₂S. (F) Activation energy profiles of different separators. (G) GITT curves of the discharge procedure. (H and I) Li₂S deposition profile of different samples.