Photocatalytic reduction of CO2 with H2O to CH4 on Cu(I) supported TiO2 nanosheets with defective {001} facets

Physical Chemistry Chemical Physics : PCCP
Shuying ZhuXuxu Wang

Abstract

Highly dispersed Cu2O clusters loaded on TiO2 nanosheets with dominant exposed {001} facets are prepared by a hydrothermal treatment followed by photodeposition. The physicochemical properties of the as-prepared samples are characterized carefully. The deposition position and chemical state of the Cu2O clusters are characterized by X-ray diffraction, transmission electron microscopy, UV-vis diffuse reflectance spectroscopy, EPR spectroscopy, and in situ CO-adsorbed FTIR spectroscopy, respectively. The results show that in situ Cu deposition leads to in situ formation of abundant oxygen vacancies (Vo) on the surface of the TiO2 nanosheets. Interestingly, the co-existence of Vo and Cu2O clusters could promote the photoactivity of CO2 reduction efficiently. The surface Vo play a significant role in the reduction of CO2. Meanwhile, the deposited Cu(I) species serve also as active sites for the formation of CH4, and then protect CH4 from degradation by generated oxidation species. For the photoreduction of CO2 to CH4, it is found that the content level of Cu2O has a significant influence on the activity. Cu-TiO2-1.0 shows the highest photocatalytic activity, which is over 30 times higher than that of the parent TiO2. This great enha...Continue Reading

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Citations

Jan 26, 2016·Physical Chemistry Chemical Physics : PCCP·Bo-Ren ChenKamila Kočí
Jul 22, 2018·Nanotechnology·Meng ShenJianlin Shi
Jul 7, 2018·Beilstein Journal of Nanotechnology·Rashmi AcharyaKulamani Parida
Jan 31, 2018·Beilstein Journal of Nanotechnology·Xiaowen HuangXuming Zhang
Sep 15, 2018·Environmental Science and Pollution Research International·Haruna AdamuJames A Anderson
Jun 25, 2021·Chemical Science·Sushma A RawoolVivek Polshettiwar
Feb 15, 2019·Chemical Reviews·Xin LiXiaobo Chen

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