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AUSTRALIAN JOURNAL OF CHEMISTRY · 2018 ·Vol. 71 ·期 12 ·965-970 · IF 1.059

The Transfer Direction of Photogenerated Electrons in BaTiO3/TiO2 and CaTiO3/TiO2

Lingfeng Ruan,Rongying Jiang,Jing Liu,Song Liu

BaTiO3/TiO2 and CaTiO3/TiO2 bilayer-type photocatalyst films have been prepared and characterised by X-ray diffraction, Raman, X-ray photoelectron spectroscopy, UV-vis, and scanning electron microscopy techniques. The photodeposition of silver was done to confirm the reduction positions of the titanate/TiO2 films. Silver deposited preferentially on the side of TiO2 for BaTiO3/TiO2 whereas on the side of CaTiO3 for CaTiO3/TiO2. These results imply that the direction of photogenerated electron transfer is coincident with the semiconductor physical principles. Upon exposure to light, electron–hole pairs are generated and subsequently separated by an internal electrostatic field in the titanate–TiO2 heterojunction.

CAS / MDL: 25322-68-3

研究领域: 材料科学 · 物理化学

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Catalysis Science & Technology · 2018 ·Vol. 9 ·期 2 ·336-346 · IF 5.365

In situ hydrothermal etching fabrication of CaTiO3 on TiO2 nanosheets with heterojunction effects to enhance CO2 adsorption and photocatalytic reduction

Jinjin Lin,Jiangshan Hu,Chengwei Qiu,Huijuan Huang,Lu Chen,Yanyu Xie,Zizhong Zhang,Huaxiang Lin,Xuxu Wang

Solar-driven carbon dioxide (CO2) reduction with water is an important and attractive approach for converting CO2 to fuel and chemicals. Developing intimate heterostructure photocatalysts is essential for efficient solar energy conversion. Here, we fabricated an efficient CaTiO3/TiO2 heterostructure composite by simple in situ hydrothermal etching of {001} facet-exposed TiO2 nanosheets with saturated calcium hydroxide solution. CaTiO3/TiO2 not only possesses an intimate contact heterostructure due to its matching band structures and similar crystal structures but also has enhanced-surface basicity to facilitate CO2 adsorption and activation for the CO2 conversion. Under irradiation, the CaTiO3/TiO2 sample greatly enhances photocatalytic CO2 reduction and shows CO production (11.72 μmol g−1 h−1) 5.6 times higher than that of bare TiO2 nanosheets. The excellent photocatalytic performance of the CaTiO3/TiO2 heterostructures is attributed to the intimate construction of CaTiO3 on TiO2 nanosheets to facilitate the separation of photogenerated charges and the basicity of CaTiO3 to provide more abundant active sites for CO2 adsorption. This study provides fundamental guidance for the rational design of efficient heterostructure photocatalysts for an outstanding photocatalytic CO2 reduction performance.

CAS / MDL: 5593-70-4

研究领域: 材料科学 · 环境科学 · 化学

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The Transfer Direction of Photogenerated Electrons in BaTiO3/TiO2 and CaTiO3/TiO2

In situ hydrothermal etching fabrication of CaTiO3 on TiO2 nanosheets with heterojunction effects to enhance CO2 adsorption and photocatalytic reduction