Fig. 6. Mechanistic understanding of K–Se battery chemistry. (a) Galvanostatic charge–discharge voltage profiles at 0.01C. (b and c) Ex situ XRD patterns. (d) XPS spectra of Se cathodes. (e) UV-vis absorption spectra. The insets show the optical images of the separators and the solution collected by soaking Se cathodes in DEGDME. (f) Schematics illustrate the reaction mechanism of K–Se battery chemistry.
