Phase-Selective Disordered Anatase/Ordered Rutile Interface System for Visible-Light-Driven, Metal-Free CO2 Reduction
| Autor: | Young-Min Kim, Jae-Hyun Shim, Simgeon Oh, Viet Q. Bui, Do-Young Kim, Joo Sung Kim, Thi Anh Le, Hyoyoung Lee, Yunhee Cho, Hee Min Hwang, Sora Bak, Ansoon Kim |
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| Rok vydání: | 2019 |
| Předmět: |
Anatase
Materials science Band gap Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Rutile Phase (matter) Photocatalysis General Materials Science 0210 nano-technology Absorption (electromagnetic radiation) Electronic band structure Visible spectrum |
| Zdroj: | ACS Applied Materials & Interfaces. 11:35693-35701 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.9b10837 |
| Popis: | Visible-light-driven photocatalytic CO2 reduction using TiO2 that can absorb light of all wavelengths has been sought for over half a century. Herein, we report a phase-selective disordered anatase/ordered rutile interface system for visible-light-driven, metal-free CO2 reduction using a narrow band structure, whose conduction band position matches well with the reduction potential of CO2 to CH4 and CO. A mixed disordered anatase/ordered rutile (Ad/Ro) TiO2 was prepared from anatase and rutile phase-mixed P25 TiO2 at room temperature and under an ambient atmosphere in sodium alkyl amine solutions. The Ad/Ro TiO2 showed a narrow band structure due to multi-internal energy band gaps of Ti3+ defect sites in the disordered anatase phase, leading to high visible light absorption and simultaneously providing fast charge separation through the crystalline rutile phase, which was faster than that of pristine P25 TiO2. The band gap of Ad/Ro TiO2 is 2.62 eV with a conduction band of −0.27 eV, which matches well wit... |
| Databáze: | OpenAIRE |
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