Visible-light-driven Bi 2 O 3 /WO 3 composites with enhanced photocatalytic activity

Adhikari, Shiba P.; Dean, Hunter; Hood, Zachary D.; Peng, Rui; More, Karren L.; Ivanov, Ilia; Wu, Zili; Lachgar, Abdou

doi:10.1039/c5ra13579f

Visible-light-driven Bi ₂ O ₃ /WO ₃ composites with enhanced photocatalytic activity

Journal Article · Mon Oct 19 04:00:00 EDT 2015 · RSC Advances

DOI:https://doi.org/10.1039/c5ra13579f· OSTI ID:1286959

Adhikari, Shiba P. ^[1]; Dean, Hunter ^[1]; Hood, Zachary D. ^[2]; Peng, Rui ^[2]; More, Karren L. ^[2]; Ivanov, Ilia ^[2]; Wu, Zili ^[2]; Lachgar, Abdou ^[1]

Wake Forest Univ., Winston Salem, NC (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Semiconductor heterojunctions (composites) have been shown to be effective photocatalytic materials to overcome the drawbacks of low photocatalytic efficiency that results from electron–hole recombination and narrow photo-response range. We prepared a novel visible-light-driven Bi₂O₃/WO₃ composite photocatalyst by hydrothermal synthesis. The composite was characterized by scanning transmission electron microscopy (STEM), scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) surface area, Raman spectroscopy, photoluminescence spectroscopy (PL) and electrochemical impedance spectroscopy (EIS) to better understand the structures, compositions, morphologies and optical properties. Bi₂O₃/WO₃ heterojunction was found to exhibit significantly higher photocatalytic activity towards the decomposition of Rhodamine B (RhB) and 4-nitroaniline (4-NA) under visible light irradiation compared to that of Bi₂O₃ and WO₃. A tentative mechanism for the enhanced photocatalytic activity of the heterostructured composite is discussed based on observed activity, band position calculations, photoluminescence, and electrochemical impedance data. Our study provides a new strategy for the design of composite materials with enhanced visible light photocatalytic performance.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1286959

Journal Information:: RSC Advances, Journal Name: RSC Advances Journal Issue: 111 Vol. 5; ISSN 2046-2069; ISSN RSCACL

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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