Understanding oxygen vacant hollow structure CeO_(2)@In_(2)O_(3) heterojunction to promote CO_(2) reduction

In order to reduce the impact of greenhouse gases,we have studied a new and efficient photocatalyst to reduce CO_(2).We recombined the hollow CeO_(2) with the In_(2)O_(3) and introduced the oxygen vacancy to obtain the CeO_(2)@In_(2)O_(3) for the hollow structure of the oxygen vacancy.The test results show that CeO_(2)@In_(2)O_(3) with oxygen vacancy hollow structure(hereinafter collectively referred to as H-CeO_(2),H-In_(2)O_(3),and H-CeO_(2-x)@In_(2)O_(3-x))have higher photocatalytic reduction activity of CO_(2) than hollow CeO_(2) and hollow In_(2)O_(3).When the illumination time was 4 h,the yields of carbon dioxide reduction to CO and methane were 38.7 and 7.8 μmol·g^(-1),respectively.Consequently,we explained the photocatalytic reduction mechanism,and carried out the X-ray diffraction(XRD)and in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS) analysis of H-CeO_(2),H-In_(2)O_(3),and H-CeO_(2-x)@In_(2)O_(3-x).This study summarizes some experience for the study of oxygen vacancy hollow structure photocatalyst,and provides some new ideas in the field of photocatalytic reduction of CO_(2).