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3D Yolk@Shell TiO<sub>2–<i>x</i></sub>/LDH Architecture: Tailored Structure for Visible Light CO<sub>2</sub> Conversion

By Abolfazl Ziarati (6277484), Alireza Badiei (1808035), Rossella Grillo (5545262) and Thomas Burgi (5545256)


CO<sub>2</sub> photoconversion into hydrocarbon solar fuels by engineered semiconductors is considered as a feasible plan to address global energy requirements in times of global warming. In this regard, three-dimensional yolk@shell hydrogenated TiO<sub>2</sub>/Co–Al layered double hydroxide (3D Y@S TiO<sub>2–<i>x</i></sub>/LDH) architecture was successfully assembled by sequential solvothermal, hydrogen treatment, and hydrothermal preparation steps. This architecture revealed a high efficiency for the photoreduction of CO<sub>2</sub> to solar fuels, without a noble metal cocatalyst. The time-dependent experiment indicated that the production of CH<sub>3</sub>OH was almost selective until 2 h (up to 251 μmol/g<sub>cat.</sub> h), whereas CH<sub>4</sub> was produced gradually by increasing the time of reaction to 12 h (up to 63 μmol/g<sub>cat.</sub> h). This significant efficiency can be ascribed to the engineering of 3D Y@S TiO<sub>2–<i>x</i></sub>/LDH architecture with considerable CO<sub>2</sub> sorption ability in mesoporous yolk@shell structure and LDH interlayer spaces. Also, oxygen vacancies in TiO<sub>2–<i>x</i></sub> could provide excess sites for sorption, activation, and conversion of CO<sub>2</sub>. Furthermore, the generated Ti<sup>3+</sup> ions in the Y@S TiO<sub>2</sub> structure as well as connecting of structure with LDH plates can facilitate the charge separation and decrease the band gap of nanoarchitecture to the visible region

Topics: Cell Biology, Molecular Biology, Evolutionary Biology, Ecology, Plant Biology, Space Science, Environmental Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, CH 3 OH, LDH interlayer spaces, CO 2, Visible Light CO 2 Conversion CO 2 photoconversion, CO 2 sorption ability, hydrothermal preparation steps, TiO
Year: 2019
DOI identifier: 10.1021/acsami.8b17232.s001
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Provided by: FigShare
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