Fig. 2

Materials characterization. a XRD patterns of Se_0.029S, pPAN, SPAN, and Se_0.06SPAN. b N₂ adsorption–desorption isotherms of Se_0.06SPAN. c Raman spectra d FTIR spectra of SPAN and Se_0.06SPAN. XPS analyses (S2p) of SPAN (e) and Se_0.06SPAN (f) composites, respectively