Direct Z-scheme Cs2O–Bi2O3–ZnO heterostructures for photocatalytic overall water splitting

Hezam, Abdo and Namratha, K. and Drmosh, Q. A. and Ponnamma, Deepalekshmi and Nagi Saeed, Adel Morshed and Ganesh, V. and Neppolian, B. and Byrappa, K. (2018) Direct Z-scheme Cs2O–Bi2O3–ZnO heterostructures for photocatalytic overall water splitting. Journal of Materials Chemistry A, 6 (43). pp. 21379-21388. ISSN 2050-7496

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In this work, a direct Z-scheme Cs2O–Bi2O3–ZnO heterostructure without any electron mediator is fabricated by a simple solution combustion route. Cs2O is chosen as a sensitizer to expand the light absorption range, and in addition, its conduction band minimum (CBM) and valence band maximum (VBM) positions are suitable to construct a direct Z-scheme system with ZnO and Bi2O3. Structural and elemental analyses show clear evidence for heterostructure formation. The Z-scheme charge carrier migration pathway in Cs2O–Bi2O3–ZnO is confirmed by high resolution XPS and ESR studies. The fabricated heterostructure exhibits a good ability to split water to H2 and O2 under simulated sunlight irradiation without any sacrificial agents or co-catalysts and has excellent photostability. The apparent quantum efficiency of the optimized Cs2O–Bi2O3–ZnO heterostructure reaches up to 0.92 at 420 nm. The excellent efficiency of this fabricated heterostructure is attributed to the efficient charge carrier separation, the high redox potential of the CBM and VBM benefiting from a direct Z-scheme charge carrier migration pathway and the extended light absorption range.

Item Type: Article
Subjects: D Physical Science > Material Science
Divisions: Department of > Material Science
Depositing User: Manjula P Library Assistant
Date Deposited: 04 Jul 2019 06:23
Last Modified: 04 Jul 2019 06:23

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