Peaks at the binding energies at 778.5 and ~793.4 eV could be fitted due to 2p3/2 and 2p1/2 of Co 3+ , and binding energies of 780.3 and 796.1 eV could be assigned to 2p3/2 and 2p1/2 of Co 2+ . Peaks located at 784.8 and 802.5 eV could be characteristic satellite peaks. Figure shows the high-resolution spectra of N1s which could be fitted into a peak at 399.7 eV corresponding to pyrrolic-N. High-resolution spectra of Cu 2p and Bi 4f are presented in (Supporting Information 1, Figure and).