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Synthesis of g-C_3N_4/Bi_2O_3/TiO_2 composite nanotubes: enhanced activity under visible light irradiation and improved photoelectrochemical activity

Zhang, Yi and Lu, Jiani and Hoffmann, Michael R. and Wang, Qiang and Cong, Yanqing and Wang, Qi and Jin, Huan (2015) Synthesis of g-C_3N_4/Bi_2O_3/TiO_2 composite nanotubes: enhanced activity under visible light irradiation and improved photoelectrochemical activity. RSC Advances, 5 (60). pp. 48983-48991. ISSN 2046-2069. https://resolver.caltech.edu/CaltechAUTHORS:20150623-085343803

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Abstract

g-C_3N_4 and Bi_2O_3 were successfully incorporated into TiO_2 nanotubes (TiO2-NT) to produce a composite nanotube material designated as g-C_3N_4/Bi_2O_3/TiO_2. The photoelectrochemical (PEC) activity under visible light irradiation with respect to bleaching of methylene blue (MB) and degradation of phenol were determined. The UV-vis absorption spectrum of the composite material, g-C_3N_4/Bi_2O_3/TiO_2-NT, was red-shifted toward a narrower band gap energy (Eg). The valence band (VB) of g-C_3N_4/Bi_2O_3/TiO_2-NT was shifted to a more positive potential resulting in an increased driving force for water oxidation. The photocurrent generated by g-C_3N_4/Bi_2O_3/TiO_2-NTs was approximately 15 times higher and the incident photon-to-current efficiency (IPCE at λ = 400 nm) was higher than that of the naked TiO_2-NTs. This response is attributed to increasing the lifetimes of photo-generated electron–hole pairs. A significantly higher PEC response in terms of the bleaching of MB was observed on g-C_3N_4/Bi_2O_3/TiO_2-NT. The roles of improved charge separation and subsequent higher electron-transfer efficiencies for in g-C_3N_4/Bi_2O_3/TiO_2-NT electrodes were examined.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/C5RA02750K DOIArticle
http://pubs.rsc.org/en/Content/ArticleLanding/2015/RA/C5RA02750KPublisherArticle
http://www.rsc.org/suppdata/c5/ra/c5ra02750k/c5ra02750k1.pdfPublisherSupplementary Information
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 2015 Royal Society of Chemistry. Received 12th February 2015; accepted 26th May 2015. This work was financially supported by the National Natural Science Foundation of China (no. 21276235, 21477114). In addition support was provided by the Educational Commission of Zhejiang Province (Y201432049).
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China21276235
National Natural Science Foundation of China21477114
Educational Commission of Zhejiang ProvinceY201432049
Issue or Number:60
Record Number:CaltechAUTHORS:20150623-085343803
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150623-085343803
Official Citation:Zhang, Y., Lu, J., Hoffmann, M. R., Wang, Q., Cong, Y., Wang, Q., & Jin, H. (2015). Synthesis of g-C3N4/Bi2O3/TiO2 composite nanotubes: enhanced activity under visible light irradiation and improved photoelectrochemical activity. [10.1039/C5RA02750K]. RSC Advances, 5(60), 48983-48991. doi: 10.1039/c5ra02750k
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58433
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:24 Jun 2015 19:07
Last Modified:03 Mar 2020 13:01

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