Core-crown quantum nanoplatelets with favorable type-II heterojunctions boost charge separation and photocatalytic NO oxidation on TiO2

Ebrahimi, Elnaz and Irfan, Muhammad and Shabani, Farzan and Kocak, Yusuf and Karakurt, Bartu and Erdem, Emre and Demir, Hilmi Volkan and Ozensoy, Emrah (2020) Core-crown quantum nanoplatelets with favorable type-II heterojunctions boost charge separation and photocatalytic NO oxidation on TiO2. ChemCatChem, 12 (24). pp. 6329-6343. ISSN 1867-3880 (Print) 1867-3899 (Online)

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Abstract

Functionalization of TiO2 (P25) with oleic acid-capped CdSe(core)/CdSeTe(crown) quantum-well nanoplatelets (NPL) yielded remarkable activity and selectivity toward nitrate formation in photocatalytic NOx oxidation and storage (PHONOS) under both ultraviolet (UV-A) and visible (VIS) light irradiation. In the NPL/P25 photocatalytic system, photocatalytic active sites responsible for the NO(g) photo-oxidation and NO2 formation reside mostly on titania, while the main function of the NPL is associated with the photocatalytic conversion of the generated NO2 into the adsorbed NO3- species, significantly boosting selectivity toward NOx storage. Photocatalytic improvement in NOx oxidation and storage upon NPL functionalization of titania can also be associated with enhanced electron-hole separation due to a favorable Type-II heterojunction formation and photo-induced electron transfer from the CdSeTe crown to the CdSe core of the quantum well system, where the trapped electrons in the CdSe core can later be transferred to titania. Re-usability of NPL/P25 system was also demonstrated upon prolonged use of the photocatalyst, where NPL/P25 catalyst surpassed P25 benchmark in all tests.
Item Type: Article
Uncontrolled Keywords: Photocatalytic NOx abatement, PHONOS, DeNO(x, titanium dioxide CdSe, CdSeTe nanoplatelets, quantum-wells
Subjects: Q Science > QC Physics > QC176-176.9 Solids. Solid state physics
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Sabancı University Nanotechnology Research and Application Center
Faculty of Engineering and Natural Sciences
Depositing User: Emre Erdem
Date Deposited: 25 Aug 2021 16:50
Last Modified: 04 Aug 2023 14:57
URI: https://research.sabanciuniv.edu/id/eprint/41856

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