Hot Electron Extraction in SWCNT/TiO2 for Photocatalytic H2 Evolution from Water

Masahiro Yamagami; Tomoyuki Tajima; Zihao Zhang; Jun Kano; Ki Ichi Yashima; Takana Matsubayashi; Huyen Khanh Nguyen; Naoto Nishiyama; Tomoya Hayashi; Yutaka Takaguchi

doi:10.3390/nano12213826

Hot Electron Extraction in SWCNT/TiO₂ for Photocatalytic H₂ Evolution from Water

Masahiro Yamagami, Tomoyuki Tajima, Zihao Zhang, Jun Kano, Ki Ichi Yashima, Takana Matsubayashi, Huyen Khanh Nguyen, Naoto Nishiyama, Tomoya Hayashi, Yutaka Takaguchi

Research output: Contribution to journal › Article › peer-review

Abstract

Single-walled carbon nanotube (SWCNT)/TiO₂ hybrids were synthesized using 1,10-bis(decyloxy)decane-core PAMAM dendrimer as a molecular glue. Upon photoirradiation of a water dispersion of SWCNT/TiO₂ 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 E₂₂ 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 C₂ energy level of SWCNT for EQY and proved the hot electron extraction pathway.

Original language	English
Article number	3826
Journal	Nanomaterials
Volume	12
Issue number	21
DOIs	https://doi.org/10.3390/nano12213826
Publication status	Published - Nov 2022

Keywords

hot electron extraction
hydrogen evolution
photocatalyst
single-walled carbon nanotube
water splitting

ASJC Scopus subject areas

Chemical Engineering(all)
Materials Science(all)

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.3390/nano12213826

Cite this

@article{11117d3288f24317b47c6027b68694eb,

title = "Hot Electron Extraction in SWCNT/TiO2 for Photocatalytic H2 Evolution from Water",

abstract = "Single-walled carbon nanotube (SWCNT)/TiO2 hybrids were synthesized using 1,10-bis(decyloxy)decane-core PAMAM dendrimer as a molecular glue. Upon photoirradiation of a water dispersion of SWCNT/TiO2 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 E22 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 C2 energy level of SWCNT for EQY and proved the hot electron extraction pathway.",

keywords = "hot electron extraction, hydrogen evolution, photocatalyst, single-walled carbon nanotube, water splitting",

author = "Masahiro Yamagami and Tomoyuki Tajima and Zihao Zhang and Jun Kano and Yashima, {Ki Ichi} and Takana Matsubayashi and Nguyen, {Huyen Khanh} and Naoto Nishiyama and Tomoya Hayashi and Yutaka Takaguchi",

note = "Publisher Copyright: {\textcopyright} 2022 by the authors.",

year = "2022",

month = nov,

doi = "10.3390/nano12213826",

language = "English",

volume = "12",

journal = "Nanomaterials",

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T1 - Hot Electron Extraction in SWCNT/TiO2 for Photocatalytic H2 Evolution from Water

AU - Yamagami, Masahiro

AU - Tajima, Tomoyuki

AU - Zhang, Zihao

AU - Kano, Jun

AU - Yashima, Ki Ichi

AU - Matsubayashi, Takana

AU - Nguyen, Huyen Khanh

AU - Nishiyama, Naoto

AU - Hayashi, Tomoya

AU - Takaguchi, Yutaka

PY - 2022/11

Y1 - 2022/11

N2 - Single-walled carbon nanotube (SWCNT)/TiO2 hybrids were synthesized using 1,10-bis(decyloxy)decane-core PAMAM dendrimer as a molecular glue. Upon photoirradiation of a water dispersion of SWCNT/TiO2 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 E22 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 C2 energy level of SWCNT for EQY and proved the hot electron extraction pathway.

AB - Single-walled carbon nanotube (SWCNT)/TiO2 hybrids were synthesized using 1,10-bis(decyloxy)decane-core PAMAM dendrimer as a molecular glue. Upon photoirradiation of a water dispersion of SWCNT/TiO2 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 E22 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 C2 energy level of SWCNT for EQY and proved the hot electron extraction pathway.

KW - hot electron extraction

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KW - photocatalyst

KW - single-walled carbon nanotube

KW - water splitting

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