期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 602, 期 -, 页码 437-451出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.05.179
关键词
S-g-C3N4/Bi2WO6; Hybrid materials; Type-II heterostructure; Charge transfer; Charge separation; Photoelectrocatalysis; Water splitting
资金
- DST-Technology Mission Division, New Delhi [DST/TMD/HFC/2K18/101]
- DST-INSPIRE Fellowship [IF170764]
The formation of heterostructure in sulfur doped-graphitic carbon nitride/bismuth tungstate (S-g-C3N4/Bi2WO6) hybrid material improves charge transfer and water oxidation kinetics, leading to enhanced photoelectrocatalytic water-splitting ability.
Sluggish charge transfers at the electrode/electrolyte interface and fast recombination of electron-hole pairs limit the photoelectrocatalytic water-splitting ability of the bismuth tungstate (Bi2WO6). To address these issues, sulfur doped-graphitic carbon nitride/bismuth tungstate (S-g-C3N4/Bi2WO6 ) heterostructured hybrid material with different wt% of S-g-C3N4 were constructed via an ultrasonic approach. The formation of heterostructure offers well-separated electron-hole pairs, thereby improving the charge transfer process, and boosting water oxidation kinetics on the surface of modified electrodes. Electrochemical impedance analysis confirms the rapid charge transfer process and quick electrochemical reaction at the electrode/electrolyte interface, which quenches the charge recombination process. The S-g-C3N4/Bi2WO6 with 3 wt% of S-g-C3N4 photoanode delivers similar to 43, similar to 18 and similar to 2-folds higher applied bias photon-to-current efficiency than S-g-C3N4, Bi2WO6, and g-C3N4/Bi2WO6 (3 wt% of g-C3N4) photoanodes, respectively. From the combination of UV-Vis, XPS valance band, and Mott-Schottky analysis the plausible band edge positions of the Bi2WO6 and S-g-C3N4 were calculated. Based on the band structure, we have concluded that the S-g-C3N4/Bi2WO6 hybrid photoanode follows a type-ll charge transfer mechanism to promote the photoelectrocatalytic water splitting ability. (C) 2021 Elsevier Inc. All rights reserved.
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