Fig. 6: Resonance Photoemission Spectra (ResPES) collected during the CO oxidation reaction on a 0.5 MLE CoOx on Au(111) sample. | Nature Communications

Fig. 6: Resonance Photoemission Spectra (ResPES) collected during the CO oxidation reaction on a 0.5 MLE CoOx on Au(111) sample.

From: Elucidating the active phases of CoOx films on Au(111) in the CO oxidation reaction

Fig. 6

a–d ResPES for an X-ray of energy ħω = 781.2 eV (Co3+ resonance, red curve), for ħω = 779.8 eV (Co2+ resonance, green curve) and for 772 eV (off-resonance, blue curve). e Co 2p XP spectra of CoO in UHV (black curve); under 100 mTorr O2 at RT (red curve); under 100 mTorr CO at 100°C (blue curve); and under 100 mTorr CO and 100 mTorr O2 (green curve). In (a) the dashed line marks the Co3+ resonant peak position in the valence band. The intensity of the resonant peak increases from a to b due to oxidation, and decreases (c) due to reduction by reaction with CO. The peak is present when both CO and O2 are present during reaction as shown in d. e APXPS for each of the reaction conditions in a–d. Data were acquired at beamline 9.3.2 of the ALS.

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