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Issue 43, 2018
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Direct Z-scheme Cs2O–Bi2O3–ZnO heterostructures for photocatalytic overall water splitting

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Abstract

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.

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

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Publication details

The article was received on 18 Aug 2018, accepted on 05 Oct 2018 and first published on 06 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08033J
Citation: J. Mater. Chem. A, 2018,6, 21379-21388
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    Direct Z-scheme Cs2O–Bi2O3–ZnO heterostructures for photocatalytic overall water splitting

    A. Hezam, K. Namratha, Q. A. Drmosh, D. Ponnamma, A. M. Nagi Saeed, V. Ganesh, B. Neppolian and K. Byrappa, J. Mater. Chem. A, 2018, 6, 21379
    DOI: 10.1039/C8TA08033J

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