Fig. 2: Structural characterizations.
From: Axial ligand induces the charge localization of Ca single-atom sites for efficient Na–S batteries
a C K-edge XANES spectra of Ca-O4N-C and Ca-O5-C. b N K-edge XANES spectra of Ca-O4N-C and N-graphene. c O K-edge XANES spectra of Ca-O4N-C and Ca-O5-C. d XANES results of Ca K-edge and e Fourier transforms of Ca K-edge EXAFS spectra of Ca-O4N-C, Ca-O5-C, and CaO. EXAFS fitting curves in R-space of f Ca-O4N-C and g Ca-O5-C. WT plots of h Ca-O4N-C and i Ca-O5-C.
