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Operando NAP-XPS during CO oxidation on Co3O4 from RT to 200 °C (0.15 mbar CO and 0.3 mbar O2): (a) the Co 2p region (hν = 1015 eV, KE = 200 eV); (b) MS catalytic data recorded during NAP-XPS; (c) the C 1s region (hν = 465 eV, KE = 200 eV); (d) the absolute amount of carbon species; and (e) the relative ratio between carbon species, both calculated from a linear peak fit.
