Direct Z-Scheme Cs2O–Bi2O3–ZnO heterostructures as efficient sunlight-driven photocatalysts

Hezam, Abdo and Namratha, K. and Deepalekshmi Ponnamma and Drmosh, Q. A. and Saeed, Adel Morshed Nagi and Cheng, Chun and Byrappa, K. (2018) Direct Z-Scheme Cs2O–Bi2O3–ZnO heterostructures as efficient sunlight-driven photocatalysts. ACS Omega, 3 (9). pp. 12260-12269. ISSN 2470-1343

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Limited light absorption, inefficient electron–hole separation, and unsuitable positions of conduction band bottom and/or valence band top are three major critical issues associated with high-efficiency photocatalytic water treatment. An attempt has been carried out here to address these issues through the synthesis of direct Z-scheme Cs2O–Bi2O3–ZnO heterostructures via a facile, fast, and economic method: solution combustions synthesis. The photocatalytic performances are examined by the 4-chlorophenol degradation test under simulated sunlight irradiation. UV–vis diffuse reflectance spectroscopy analysis, electrochemical impedance test, and the observed transient photocurrent responses prove not only the significant role of Cs2O in extending light absorption to visible and near-infrared regions but also its involvement in charge carrier separation. Radical-trapping experiments verify the direct Z-scheme approach followed by the charge carriers in heterostructured Cs2O–Bi2O3–ZnO photocatalysts. The Z-scheme charge carrier pathway induced by the presence of Cs2O has emerged as the reason behind the efficient charge carrier separation and high photocatalytic activity.

Item Type: Article
Subjects: D Physical Science > Material Science
Divisions: Department of > Material Science
Depositing User: Manjula P Library Assistant
Date Deposited: 06 Jul 2019 10:41
Last Modified: 06 Jul 2019 10:41

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