The synergistic effect of cation mixing in mesoporous BixFe1−xVO4 heterojunction photoanodes for solar water splitting
Mixed metal vanadates are an interesting class of materials due to their favorable bandgap for visible light absorption and their catalytic activity. Here, we report a novel BixFe1−xVO4 mixture system fabricated by electrospinning, which upon annealing is composed of triclinic FeVO4 and monoclinic B...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2019
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/87644 http://hdl.handle.net/10220/49887 |
| _version_ | 1826120251949973504 |
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| author | Zhang, Mengyuan Pham, Huu Khue Fang, Yanan Tay, Ying Fan Fatwa F. Abdi Wong, Lydia Helena |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Zhang, Mengyuan Pham, Huu Khue Fang, Yanan Tay, Ying Fan Fatwa F. Abdi Wong, Lydia Helena |
| author_sort | Zhang, Mengyuan |
| collection | NTU |
| description | Mixed metal vanadates are an interesting class of materials due to their favorable bandgap for visible light absorption and their catalytic activity. Here, we report a novel BixFe1−xVO4 mixture system fabricated by electrospinning, which upon annealing is composed of triclinic FeVO4 and monoclinic BiVO4 phases. The mixture demonstrates extended optical absorption and a clear bandgap shift as compared with a pure BiVO4. This is also accompanied by an extended wavelength range for its photoactivity as evident from the incident photon-to-current efficiency. In addition, the mixture with a Bi/(Bi + Fe) ratio of 0.5 (i.e., x = 0.5) shows superior charge transfer and charge separation efficiency. The improved charge transfer efficiency is attributed to the higher catalytic activity of the mixed cation, while the presence of a BiVO4/FeVO4 heterojunction enhances the charge separation. The formation of the heterojunction is verified through detailed microscopic investigations revealing BiVO4 particles intimately surrounded by FeVO4. Our results demonstrate the advantage of establishing a mixture of complex metal oxides in extending optical absorption and boosting the photoelectrochemical performance. |
| first_indexed | 2024-10-01T05:13:09Z |
| format | Journal Article |
| id | ntu-10356/87644 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:13:09Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/876442023-07-14T15:52:00Z The synergistic effect of cation mixing in mesoporous BixFe1−xVO4 heterojunction photoanodes for solar water splitting Zhang, Mengyuan Pham, Huu Khue Fang, Yanan Tay, Ying Fan Fatwa F. Abdi Wong, Lydia Helena School of Materials Science & Engineering Heterojunction Photoactivity Engineering::Materials Mixed metal vanadates are an interesting class of materials due to their favorable bandgap for visible light absorption and their catalytic activity. Here, we report a novel BixFe1−xVO4 mixture system fabricated by electrospinning, which upon annealing is composed of triclinic FeVO4 and monoclinic BiVO4 phases. The mixture demonstrates extended optical absorption and a clear bandgap shift as compared with a pure BiVO4. This is also accompanied by an extended wavelength range for its photoactivity as evident from the incident photon-to-current efficiency. In addition, the mixture with a Bi/(Bi + Fe) ratio of 0.5 (i.e., x = 0.5) shows superior charge transfer and charge separation efficiency. The improved charge transfer efficiency is attributed to the higher catalytic activity of the mixed cation, while the presence of a BiVO4/FeVO4 heterojunction enhances the charge separation. The formation of the heterojunction is verified through detailed microscopic investigations revealing BiVO4 particles intimately surrounded by FeVO4. Our results demonstrate the advantage of establishing a mixture of complex metal oxides in extending optical absorption and boosting the photoelectrochemical performance. MOE (Min. of Education, S’pore) Published version 2019-09-06T06:49:54Z 2019-12-06T16:46:18Z 2019-09-06T06:49:54Z 2019-12-06T16:46:18Z 2019 Journal Article Zhang, M., Pham, H. K., Fang, Y., Tay, Y. F., Fatwa F. Abdi, & Wong, L. H. (2019). The synergistic effect of cation mixing in mesoporous BixFe1−xVO4 heterojunction photoanodes for solar water splitting. Journal of Materials Chemistry A, 7(24), 14816-14824. doi:10.1039/C9TA01791G 2050-7488 https://hdl.handle.net/10356/87644 http://hdl.handle.net/10220/49887 10.1039/C9TA01791G en Journal of Materials Chemistry A © 2019 The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. 9 p. application/pdf |
| spellingShingle | Heterojunction Photoactivity Engineering::Materials Zhang, Mengyuan Pham, Huu Khue Fang, Yanan Tay, Ying Fan Fatwa F. Abdi Wong, Lydia Helena The synergistic effect of cation mixing in mesoporous BixFe1−xVO4 heterojunction photoanodes for solar water splitting |
| title | The synergistic effect of cation mixing in mesoporous BixFe1−xVO4 heterojunction photoanodes for solar water splitting |
| title_full | The synergistic effect of cation mixing in mesoporous BixFe1−xVO4 heterojunction photoanodes for solar water splitting |
| title_fullStr | The synergistic effect of cation mixing in mesoporous BixFe1−xVO4 heterojunction photoanodes for solar water splitting |
| title_full_unstemmed | The synergistic effect of cation mixing in mesoporous BixFe1−xVO4 heterojunction photoanodes for solar water splitting |
| title_short | The synergistic effect of cation mixing in mesoporous BixFe1−xVO4 heterojunction photoanodes for solar water splitting |
| title_sort | synergistic effect of cation mixing in mesoporous bixfe1 xvo4 heterojunction photoanodes for solar water splitting |
| topic | Heterojunction Photoactivity Engineering::Materials |
| url | https://hdl.handle.net/10356/87644 http://hdl.handle.net/10220/49887 |
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