fig3

Figure 3. (A) UV-vis spectra after adsorption between NaPSs with different samples and digital photos (inset); High-resolution (B) Co 2p; (C) Fe 2p XPS spectra of C/CoFe-MXene before and after adsorption; High-resolution (D) S 2p XPS spectra of C/CoFe-MXene, C/CoFe and MXene after adsorption; (E) CV curves of symmetric batteries with different samples at 10 mV s^-1; (F) LSV curves of Na₂S oxidation and corresponding Tafel plots (inset). UV-vis: Ultraviolet-visible; XPS: X-ray photoelectron spectroscopy; CV: cyclic voltammetry; LSV: linear sweep voltammetry; NaPSs: sodium polysulfides.