Fig. 2: Electronic structure of the CF-based electrodes.

a Co L-edge near edge X-ray absorption fine structure (NEXAFS) spectra of CF-O, CF-SO and, CF-FeSO. b O K-edge NEXAFS spectra of CF-O, CF-SO and, CF-FeSO. c Raman spectra of CF-O, CF-SO and, CF-FeSO. d Co K-edge XANES of Co foil, Raw CF, CF-O, CF-SO and, CF-FeSO.