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Hydrogenated nanotubes/nanowires assembled from TiO2 nanoflakes exposed with {111} facets: excellent photocatalytic CO2 reduction activity and charge separation mechanism between (111) and (-1-1-1) polar surfaces

Abstract

Abstract The nanotubes/nanowires assembled from TiO2 nanoflakes exposed with {111} facets were prepared via heating a mixture of titanium (IV) oxysulfate-sulfuric acid hydrate, glacial acetic acid and water. Photocatalytic CO2 reduction activity of the as-prepared TiO2 nanoflake based nanotubes/nanowires was remarkably increased through hydrogenation. The CH4 evolution rate of the hydrogenated TiO2 nanotubes/nanowires is as high as 1708.1 μmol g-1 h-1, which is the highest of all TiO2 photocatalysts and noticeably higher than the majority of TiO2 based photocatalysts. The excellent photocatalytic performance is ascribed to the exposed clean TiO2 {111} facets and enhanced solar absorption. On the basis of polar structure of the exposed TiO2 {111} crystal facets, we proposed a separation mechanism of photocreated electrons and holes. A spontaneous electric field (Es) is created between polar TiO2 (111) and (-1-1-1)surfaces, Under Es, the photocreated electrons and holes transit to TiO2 (111) and (-1-1-1) surfaces, respectively. The redox reactions selectively take place at the Ti-TiO2 (111) and O-TiO2 (-1-1-1) polar planes. The charge separation mechanism supplies a clear insight to understanding of photocatalysis of the high performance semiconductor nanocrystals and offers guidance on design of high performance photocatalysts for CO2 reduction.

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Supplementary files

Publication details

The article was received on 20 Jan 2019, accepted on 15 May 2019 and first published on 16 May 2019


Article type: Paper
DOI: 10.1039/C9TA00736A
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Hydrogenated nanotubes/nanowires assembled from TiO2 nanoflakes exposed with {111} facets: excellent photocatalytic CO2 reduction activity and charge separation mechanism between (111) and (-1-1-1) polar surfaces

    J. Liu, B. Liu, Y. Ren, Y. Yuan, H. Zhao, H. Yang and S. F. Liu, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA00736A

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