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Enhanced photoelectrocatalytic performance of titanium dioxide/carbon cloth based photoelectrodes by graphene modification under visible-light irradiation.
J Hazard Mater. 2013 Dec 15; 263 Pt 2:291-8.JH

Abstract

Reduced graphene oxide nanosheets modified TiO2 nanospheres on carbon cloth electrodes (RGO/TiO2/CC) have been fabricated and used for photoelectrocatalytic (PEC) degradation of organic pollutants under visible light irradiation. The fabricated RGO/TiO2/CC electrodes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectroscopy. Compared with TiO2/CC electrode, the RGO modified TiO2/CC electrode evidently shows improved visible light-driven PEC activity for degradation of an often used model pollutant, methylene blue (MB). Moreover, the efficiency of MB degradation by PEC process (0.0133 min(-1)) is about 13-fold and 7-fold faster than that of electrochemical process (0.001 min(-1)) and photocatalytic process (0.0018 min(-1)), respectively. The improved catalytic activity for PEC degradation of MB pollutants could be attributed to the existence of RGO, which extends the absorption onset of TiO2 to longer wavelength direction and promotes the separation of electron-hole pairs generated under visible light irradiation. The promotion effect on the electron-hole separation is supported by photocurrent and electrochemical impedance measurements. In addition, a synergetic effect of photocatalysis and electrocatalysis is involved in the PEC process, by which the recombination of photogenerated electron-hole pairs is significantly suppressed.

Authors+Show Affiliations

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24091125

Citation

Zhai, Chunyang, et al. "Enhanced Photoelectrocatalytic Performance of Titanium Dioxide/carbon Cloth Based Photoelectrodes By Graphene Modification Under Visible-light Irradiation." Journal of Hazardous Materials, vol. 263 Pt 2, 2013, pp. 291-8.
Zhai C, Zhu M, Ren F, et al. Enhanced photoelectrocatalytic performance of titanium dioxide/carbon cloth based photoelectrodes by graphene modification under visible-light irradiation. J Hazard Mater. 2013;263 Pt 2:291-8.
Zhai, C., Zhu, M., Ren, F., Yao, Z., Du, Y., & Yang, P. (2013). Enhanced photoelectrocatalytic performance of titanium dioxide/carbon cloth based photoelectrodes by graphene modification under visible-light irradiation. Journal of Hazardous Materials, 263 Pt 2, 291-8. https://doi.org/10.1016/j.jhazmat.2013.09.013
Zhai C, et al. Enhanced Photoelectrocatalytic Performance of Titanium Dioxide/carbon Cloth Based Photoelectrodes By Graphene Modification Under Visible-light Irradiation. J Hazard Mater. 2013 Dec 15;263 Pt 2:291-8. PubMed PMID: 24091125.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Enhanced photoelectrocatalytic performance of titanium dioxide/carbon cloth based photoelectrodes by graphene modification under visible-light irradiation. AU - Zhai,Chunyang, AU - Zhu,Mingshan, AU - Ren,Fangfang, AU - Yao,Zhangquan, AU - Du,Yukou, AU - Yang,Ping, Y1 - 2013/09/16/ PY - 2013/05/16/received PY - 2013/09/07/revised PY - 2013/09/10/accepted PY - 2013/10/5/entrez PY - 2013/10/5/pubmed PY - 2014/8/15/medline KW - Dye degradation KW - Graphene KW - Photoelectrocatalysis KW - TiO(2) KW - Visible light SP - 291 EP - 8 JF - Journal of hazardous materials JO - J. Hazard. Mater. VL - 263 Pt 2 N2 - Reduced graphene oxide nanosheets modified TiO2 nanospheres on carbon cloth electrodes (RGO/TiO2/CC) have been fabricated and used for photoelectrocatalytic (PEC) degradation of organic pollutants under visible light irradiation. The fabricated RGO/TiO2/CC electrodes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectroscopy. Compared with TiO2/CC electrode, the RGO modified TiO2/CC electrode evidently shows improved visible light-driven PEC activity for degradation of an often used model pollutant, methylene blue (MB). Moreover, the efficiency of MB degradation by PEC process (0.0133 min(-1)) is about 13-fold and 7-fold faster than that of electrochemical process (0.001 min(-1)) and photocatalytic process (0.0018 min(-1)), respectively. The improved catalytic activity for PEC degradation of MB pollutants could be attributed to the existence of RGO, which extends the absorption onset of TiO2 to longer wavelength direction and promotes the separation of electron-hole pairs generated under visible light irradiation. The promotion effect on the electron-hole separation is supported by photocurrent and electrochemical impedance measurements. In addition, a synergetic effect of photocatalysis and electrocatalysis is involved in the PEC process, by which the recombination of photogenerated electron-hole pairs is significantly suppressed. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/24091125/Enhanced_photoelectrocatalytic_performance_of_titanium_dioxide/carbon_cloth_based_photoelectrodes_by_graphene_modification_under_visible_light_irradiation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(13)00657-2 DB - PRIME DP - Unbound Medicine ER -