Fig. 2: Catalyst characterization.
From: Grave-to-cradle photothermal upcycling of waste polyesters over spent LiCoO2
a Reaction scheme for the chemical delithiation of LCO. b Li/Co (mol/mol) ratio in various samples, including LCO pristine, treated with ball milling for 4 h (BM-LiCoO2), chemical delithiation with 4 h, 8 h and 12 h. c, d Rietveld refinement powder XRD patterns of LiCoO2 pristine (c) Li0.76CoO2 (d). e–g Co K-edge XANES spectra of LiCoO2, Li0.92CoO2, Li0.76CoO2 and Co foil. h k3-weighted Fourier-transformed EXAFS of LiCoO2, Li0.92CoO2, and Li0.76CoO2. i Schematic views of the atomic structures of LiCoO2 and Li1-xCoO2. The green, red, and gray spheres represent Co, O and Li atoms, respectively.
