Fig. 3: Surface composition during CO oxidation on a partially oxidized cobalt film on Au(111).
From: Elucidating the active phases of CoOx films on Au(111) in the CO oxidation reaction
APXPS in the (a) Co 2p, (b) C 1 s, and (c) O 1s core level regions during the CO oxidation reaction on Au-supported 1 MLE CoO0.25 film. From bottom: at RT in UHV (black), under 100 mTorr of CO at RT (red), at 100 °C (blue), and at 150 °C (green). Above 100 °C the reduction of Co2+ in the CoO0.25 film is shown by the increase in the Co 2p3/2 peak and the decrease of the lattice oxygen peak near 530 eV. The reaction rate is still low due to the presence of carbonate (peak at ~289 eV) that blocks the reaction. The XPS data were acquired at beamline 23-ID-2 (IOS) of NSLS-II.
