Fig. 2: Characterization of electronic structure and coordination structure.

L3-edge XANES spectra of a Pt, and K-edge XANES spectra of b Co, c Fe, and d Ni in the PD-PZFCNC-HEI nanoparticles (the embedded images correspond to the local magnified views of the corresponding regions); EXAFS spectra of e Pt, f Co, g Fe, h Ni elements; WT-EXAFS plots of i Co foil, j CoO, and k PD-PZFCNC-HEI for Co element; l X-ray photoelectron spectroscopy spectra collected at the N 1s edges for the PD-PZFCNC-HEI sample.