Hot Electron Extraction in SWCNT/TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution from Water
Single-walled carbon nanotube (SWCNT)/TiO<sub>2</sub> hybrids were synthesized using 1,10-bis(decyloxy)decane-core PAMAM dendrimer as a molecular glue. Upon photoirradiation of a water dispersion of SWCNT/TiO<sub>2</sub> hybrids with visible light (λ > 422 nm), the hydroge...
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| Language: | English |
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MDPI AG
2022-10-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/21/3826 |
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| author | Masahiro Yamagami Tomoyuki Tajima Zihao Zhang Jun Kano Ki-ichi Yashima Takana Matsubayashi Huyen Khanh Nguyen Naoto Nishiyama Tomoya Hayashi Yutaka Takaguchi |
| author_facet | Masahiro Yamagami Tomoyuki Tajima Zihao Zhang Jun Kano Ki-ichi Yashima Takana Matsubayashi Huyen Khanh Nguyen Naoto Nishiyama Tomoya Hayashi Yutaka Takaguchi |
| author_sort | Masahiro Yamagami |
| collection | DOAJ |
| description | Single-walled carbon nanotube (SWCNT)/TiO<sub>2</sub> hybrids were synthesized using 1,10-bis(decyloxy)decane-core PAMAM dendrimer as a molecular glue. Upon photoirradiation of a water dispersion of SWCNT/TiO<sub>2</sub> hybrids with visible light (λ > 422 nm), the hydrogen evolution reaction proceeded at a rate of 0.95 mmol/h·g in the presence of a sacrificial agent (1-benzyl-1,4-dihydronicotinamide, BNAH). External quantum yields (EQYs) of the hydrogen production reaction photosensitized by (6,5), (7,5), and (8,3) tubes were estimated to be 5.5%, 3.6%, and 2.2%, respectively, using monochromatic lights corresponding to their E<sub>22</sub> absorptions (570 nm, 650 nm, and 680 nm). This order of EQYs (i.e., (6,5) > (7,5) > (8,3)SWCNTs) exhibited the dependence on the C<sub>2</sub> energy level of SWCNT for EQY and proved the hot electron extraction pathway. |
| first_indexed | 2024-03-09T18:46:41Z |
| format | Article |
| id | doaj.art-15d1be80a7c645d0856f83efb45fa6e4 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T18:46:41Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-15d1be80a7c645d0856f83efb45fa6e42023-11-24T06:09:48ZengMDPI AGNanomaterials2079-49912022-10-011221382610.3390/nano12213826Hot Electron Extraction in SWCNT/TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution from WaterMasahiro Yamagami0Tomoyuki Tajima1Zihao Zhang2Jun Kano3Ki-ichi Yashima4Takana Matsubayashi5Huyen Khanh Nguyen6Naoto Nishiyama7Tomoya Hayashi8Yutaka Takaguchi9Graduate School of Environmental and Life Science, Okayama University, 3-1-1 Tsushima-Naka, Kita-ku, Okayama 700-8530, JapanGraduate School of Environmental and Life Science, Okayama University, 3-1-1 Tsushima-Naka, Kita-ku, Okayama 700-8530, JapanGraduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, JapanGraduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, JapanDepartment of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, JapanDepartment of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, JapanDepartment of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, JapanDepartment of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, JapanDepartment of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, JapanDepartment of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, JapanSingle-walled carbon nanotube (SWCNT)/TiO<sub>2</sub> hybrids were synthesized using 1,10-bis(decyloxy)decane-core PAMAM dendrimer as a molecular glue. Upon photoirradiation of a water dispersion of SWCNT/TiO<sub>2</sub> hybrids with visible light (λ > 422 nm), the hydrogen evolution reaction proceeded at a rate of 0.95 mmol/h·g in the presence of a sacrificial agent (1-benzyl-1,4-dihydronicotinamide, BNAH). External quantum yields (EQYs) of the hydrogen production reaction photosensitized by (6,5), (7,5), and (8,3) tubes were estimated to be 5.5%, 3.6%, and 2.2%, respectively, using monochromatic lights corresponding to their E<sub>22</sub> absorptions (570 nm, 650 nm, and 680 nm). This order of EQYs (i.e., (6,5) > (7,5) > (8,3)SWCNTs) exhibited the dependence on the C<sub>2</sub> energy level of SWCNT for EQY and proved the hot electron extraction pathway.https://www.mdpi.com/2079-4991/12/21/3826single-walled carbon nanotubephotocatalysthydrogen evolutionwater splittinghot electron extraction |
| spellingShingle | Masahiro Yamagami Tomoyuki Tajima Zihao Zhang Jun Kano Ki-ichi Yashima Takana Matsubayashi Huyen Khanh Nguyen Naoto Nishiyama Tomoya Hayashi Yutaka Takaguchi Hot Electron Extraction in SWCNT/TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution from Water Nanomaterials single-walled carbon nanotube photocatalyst hydrogen evolution water splitting hot electron extraction |
| title | Hot Electron Extraction in SWCNT/TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution from Water |
| title_full | Hot Electron Extraction in SWCNT/TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution from Water |
| title_fullStr | Hot Electron Extraction in SWCNT/TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution from Water |
| title_full_unstemmed | Hot Electron Extraction in SWCNT/TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution from Water |
| title_short | Hot Electron Extraction in SWCNT/TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution from Water |
| title_sort | hot electron extraction in swcnt tio sub 2 sub for photocatalytic h sub 2 sub evolution from water |
| topic | single-walled carbon nanotube photocatalyst hydrogen evolution water splitting hot electron extraction |
| url | https://www.mdpi.com/2079-4991/12/21/3826 |
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