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

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....

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Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-10, Vol.12 (21), p.3826
Main Authors: Yamagami, Masahiro, Tajima, Tomoyuki, Zhang, Zihao, Kano, Jun, Yashima, Ki-ichi, Matsubayashi, Takana, Nguyen, Huyen Khanh, Nishiyama, Naoto, Hayashi, Tomoya, Takaguchi, Yutaka
Format: Article
Language:English
Subjects:
Carbon
Energy
Energy levels
hot electron extraction
Hot electrons
Hybrids
Hydrogen
hydrogen evolution
Hydrogen evolution reactions
Hydrogen production
Photocatalysis
photocatalyst
Single wall carbon nanotubes
single-walled carbon nanotube
Spectrum analysis
Titanium dioxide
Tubes
water splitting
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Summary: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.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12213826