Fig. 4: Reaction intermediate tracking and mechanism investigations. | Nature Communications

Fig. 4: Reaction intermediate tracking and mechanism investigations.

From: Electronic asymmetry of lattice oxygen sites in ZnO promotes the photocatalytic oxidative coupling of methane

Fig. 4

a Partially enlarged in situ irradiation XPS of Ce 3d over Ce0.6%-ZnO. b The fitted photocarrier kinetic decay curves at 486 nm obtained from fs-TAS. c Time-resolved in situ mass spectra (MS) over Ce0.6%-AZO under the mixed atmospheres of CH4 and 16O2 or isotopic 18O2 gas. d In situ electron paramagnetic resonance (EPR) spectra of AZO and Ce0.6%-AZO in the dark field with an Ar atmosphere and under light illumination with an Ar or CH4 atmosphere. e, f In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) of AZO (e) and Ce0.6%-AZO (f).

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