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

Nanomaterials (Oct 2022)

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

Affiliations

Masahiro Yamagami: Graduate School of Environmental and Life Science, Okayama University, 3-1-1 Tsushima-Naka, Kita-ku, Okayama 700-8530, Japan
Tomoyuki Tajima: Graduate School of Environmental and Life Science, Okayama University, 3-1-1 Tsushima-Naka, Kita-ku, Okayama 700-8530, Japan
Zihao Zhang: Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
Jun Kano: Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
Ki-ichi Yashima: Department of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, Japan
Takana Matsubayashi: Department of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, Japan
Huyen Khanh Nguyen: Department of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, Japan
Naoto Nishiyama: Department of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, Japan
Tomoya Hayashi: Department of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, Japan
Yutaka Takaguchi: Department of Material Design and Engineering, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, Japan

DOI: https://doi.org/10.3390/nano12213826
Journal volume & issue: Vol. 12, no. 21
p. 3826

Abstract

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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.

Published in Nanomaterials

ISSN: 2079-4991 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry
Website: https://www.mdpi.com/journal/nanomaterials

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