Understanding the photoelectrochemical properties of a reduced graphene oxide–WO3 heterojunction photoanode for efficient solar-light-driven overall water splitting
WO3–reduced graphene oxide (WO3–RGO) heterojunction electrodes were prepared for photoelectrochemical (PEC) overall water splitting. The WO3 photoanode incorporated with RGO showed significantly enhanced PEC properties and, hence, photocatalytic water splitting, compared to the bare WO3 at a bias la...
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sg-ntu-dr.10356-1035912020-06-01T10:26:46Z Understanding the photoelectrochemical properties of a reduced graphene oxide–WO3 heterojunction photoanode for efficient solar-light-driven overall water splitting Lin, Jingdong Hu, Peng Zhang, Yan Fan, Meiting He, Ziming Ngaw, Chee Keong Loo, Say Chye Joachim Liao, Daiwei Tan, Thatt Yang Timothy School of Chemical and Biomedical Engineering School of Materials Science & Engineering WO3–reduced graphene oxide (WO3–RGO) heterojunction electrodes were prepared for photoelectrochemical (PEC) overall water splitting. The WO3 photoanode incorporated with RGO showed significantly enhanced PEC properties and, hence, photocatalytic water splitting, compared to the bare WO3 at a bias larger than 0.7 V vs. Ag/AgCl, while a decrease in the PEC properties of WO3–RGO compared to the WO3 electrode was observed at a bias smaller than 0.7 V vs. Ag/AgCl. RGO could play a favorable role in enhancing the electron–hole separation due to the presence of interface states according to the Bardeen model, but it could also provide active sites for the electron–hole recombination. A more positive applied bias is in favor of effective electron–hole separation, by means of quick collection and transport of electrons by RGO. As a result, a higher PEC performance of WO3–RGO can only be realised at a relatively more positive bias. This study gives insights into the complex nature of a RGO–semiconductor heterojunction, and its implications on the overall photoconversion efficiency. 2013-10-25T04:02:34Z 2019-12-06T21:16:02Z 2013-10-25T04:02:34Z 2019-12-06T21:16:02Z 2013 2013 Journal Article Lin, J., Hu, P., Zhang, Y., Fan, M., He, Z., Ngaw, C. K. et al. (2013). Understanding the photoelectrochemical properties of a reduced graphene oxide–WO3 heterojunction photoanode for efficient solar-light-driven overall water splitting. RSC advances, 3(24), 9330-9336. https://hdl.handle.net/10356/103591 http://hdl.handle.net/10220/16911 10.1039/c3ra40550h en RSC advances |
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WO3–reduced graphene oxide (WO3–RGO) heterojunction electrodes were prepared for photoelectrochemical (PEC) overall water splitting. The WO3 photoanode incorporated with RGO showed significantly enhanced PEC properties and, hence, photocatalytic water splitting, compared to the bare WO3 at a bias larger than 0.7 V vs. Ag/AgCl, while a decrease in the PEC properties of WO3–RGO compared to the WO3 electrode was observed at a bias smaller than 0.7 V vs. Ag/AgCl. RGO could play a favorable role in enhancing the electron–hole separation due to the presence of interface states according to the Bardeen model, but it could also provide active sites for the electron–hole recombination. A more positive applied bias is in favor of effective electron–hole separation, by means of quick collection and transport of electrons by RGO. As a result, a higher PEC performance of WO3–RGO can only be realised at a relatively more positive bias. This study gives insights into the complex nature of a RGO–semiconductor heterojunction, and its implications on the overall photoconversion efficiency. |
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School of Chemical and Biomedical Engineering |
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School of Chemical and Biomedical Engineering Lin, Jingdong Hu, Peng Zhang, Yan Fan, Meiting He, Ziming Ngaw, Chee Keong Loo, Say Chye Joachim Liao, Daiwei Tan, Thatt Yang Timothy |
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Lin, Jingdong Hu, Peng Zhang, Yan Fan, Meiting He, Ziming Ngaw, Chee Keong Loo, Say Chye Joachim Liao, Daiwei Tan, Thatt Yang Timothy |
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Lin, Jingdong Hu, Peng Zhang, Yan Fan, Meiting He, Ziming Ngaw, Chee Keong Loo, Say Chye Joachim Liao, Daiwei Tan, Thatt Yang Timothy Understanding the photoelectrochemical properties of a reduced graphene oxide–WO3 heterojunction photoanode for efficient solar-light-driven overall water splitting |
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Lin, Jingdong |
title |
Understanding the photoelectrochemical properties of a reduced graphene oxide–WO3 heterojunction photoanode for efficient solar-light-driven overall water splitting |
title_short |
Understanding the photoelectrochemical properties of a reduced graphene oxide–WO3 heterojunction photoanode for efficient solar-light-driven overall water splitting |
title_full |
Understanding the photoelectrochemical properties of a reduced graphene oxide–WO3 heterojunction photoanode for efficient solar-light-driven overall water splitting |
title_fullStr |
Understanding the photoelectrochemical properties of a reduced graphene oxide–WO3 heterojunction photoanode for efficient solar-light-driven overall water splitting |
title_full_unstemmed |
Understanding the photoelectrochemical properties of a reduced graphene oxide–WO3 heterojunction photoanode for efficient solar-light-driven overall water splitting |
title_sort |
understanding the photoelectrochemical properties of a reduced graphene oxide–wo3 heterojunction photoanode for efficient solar-light-driven overall water splitting |
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2013 |
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https://hdl.handle.net/10356/103591 http://hdl.handle.net/10220/16911 |
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1681059011122692096 |