Component | BE (eV) | FWHM (eV) | Assignment |
1 | 533.37 ± 0.05 | 2.51 ± 0.12 | Surface oxygen bonded to carbon |
2 | 531.36 ± 0.05 | 3.12 ± 0.07 | Oxygen in short O-Fe bonds |
3 | 529.61 ± 0.19 | 2.54 ± 0.20 | Oxygen in long O-Fe bonds |
4 | 528.32 | 2.48 | Physi-sorbed oxygen |