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. 2016 Jul 20;7:12273. doi: 10.1038/ncomms12273

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(a) EPR signals of 0.1-Ag under different environments. From the bottom-up, the traces are for a fresh sample measured in an air atmosphere, measured in an air atmosphere after illumination, measured immediately after injection CH₄ to the illuminated system, measured after illumination under CH₄ and air atmosphere, respectively. (b) In situ IR spectra of methane photocatalytic oxidation collected at different illumination time intervals. (c) Schematic illustration for the photocatalytic CH₄ reaction processes under ambient conditions.