Fig. 4: The photoresponse of the prepared photocatalysts.

Photocatalytic CO2 reduction performance of comm. ZnO and the prepared samples: time course of a CO and b O2 production yields. c Wavelength dependence of the AQE and the UV–vis absorption spectrum of 2% Mn, C-ZnO sample. d Isotopic labeling chromatogram using 13NaHCO3 as a carbon source and e GC-MS data of the peak at retention time (RT) of 11.57 coressponding to 13CO.