Photocatalytic Ammonia Decomposition Using Dye-Encapsulated Single-Walled Carbon Nanotubes

Tomoyuki Tajima; Kotone Yano; Kazushi Mukai; Yutaka Takaguchi

doi:10.3390/catal14100715

Photocatalytic Ammonia Decomposition Using Dye-Encapsulated Single-Walled Carbon Nanotubes

Tomoyuki Tajima^*, Kotone Yano, Kazushi Mukai, Yutaka Takaguchi^*

^*Corresponding author for this work

Materials Design and Engineering

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

2 Scopus citations

Abstract

The photocatalytic decomposition of ammonia to produce N₂ and H₂ was achieved using single-walled carbon nanotube (SWCNT) nanohybrids. The physical modification of ferrocene-dye-encapsulated CNTs by amphiphilic C₆₀-dendron yielded nanohybrids with a dye/CNT/C₆₀ coaxial heterojunction. Upon irradiation with visible light, an aqueous solution of NH₃ and dye@CNT/C₆₀-dendron nanohybrids produced both N₂ and H₂ in a stoichiometric ratio of 1/3. The action spectra of this reaction clearly demonstrated that the encapsulated dye acted as the photosensitizer, exhibiting an apparent quantum yield (AQY) of 0.22% at 510 nm (the λ_max of the dye). This study reports the first example of dye-sensitized ammonia decomposition and provides a new avenue for developing efficient and sustainable photocatalytic hydrogen production systems.

Original language	English
Article number	715
Journal	Catalysts
Volume	14
Issue number	10
DOIs	https://doi.org/10.3390/catal14100715
State	Published - 2024/10

Keywords

ammonia decomposition
carbon nanotube
dye sensitization
fullerene
hydrogen evolution
photocatalyst

ASJC Scopus subject areas

Catalysis
General Environmental Science
Physical and Theoretical Chemistry

UN SDGs

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

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10.3390/catal14100715

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@article{f073a806710c49fc970adae9c241fa85,

title = "Photocatalytic Ammonia Decomposition Using Dye-Encapsulated Single-Walled Carbon Nanotubes",

abstract = "The photocatalytic decomposition of ammonia to produce N2 and H2 was achieved using single-walled carbon nanotube (SWCNT) nanohybrids. The physical modification of ferrocene-dye-encapsulated CNTs by amphiphilic C60-dendron yielded nanohybrids with a dye/CNT/C60 coaxial heterojunction. Upon irradiation with visible light, an aqueous solution of NH3 and dye@CNT/C60-dendron nanohybrids produced both N2 and H2 in a stoichiometric ratio of 1/3. The action spectra of this reaction clearly demonstrated that the encapsulated dye acted as the photosensitizer, exhibiting an apparent quantum yield (AQY) of 0.22% at 510 nm (the λmax of the dye). This study reports the first example of dye-sensitized ammonia decomposition and provides a new avenue for developing efficient and sustainable photocatalytic hydrogen production systems.",

keywords = "ammonia decomposition, carbon nanotube, dye sensitization, fullerene, hydrogen evolution, photocatalyst",

author = "Tomoyuki Tajima and Kotone Yano and Kazushi Mukai and Yutaka Takaguchi",

note = "Publisher Copyright: {\textcopyright} 2024 by the authors.",

year = "2024",

month = oct,

doi = "10.3390/catal14100715",

language = "英語",

volume = "14",

journal = "Catalysts",

issn = "2073-4344",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "10",

}

TY - JOUR

T1 - Photocatalytic Ammonia Decomposition Using Dye-Encapsulated Single-Walled Carbon Nanotubes

AU - Tajima, Tomoyuki

AU - Yano, Kotone

AU - Mukai, Kazushi

AU - Takaguchi, Yutaka

PY - 2024/10

Y1 - 2024/10

N2 - The photocatalytic decomposition of ammonia to produce N2 and H2 was achieved using single-walled carbon nanotube (SWCNT) nanohybrids. The physical modification of ferrocene-dye-encapsulated CNTs by amphiphilic C60-dendron yielded nanohybrids with a dye/CNT/C60 coaxial heterojunction. Upon irradiation with visible light, an aqueous solution of NH3 and dye@CNT/C60-dendron nanohybrids produced both N2 and H2 in a stoichiometric ratio of 1/3. The action spectra of this reaction clearly demonstrated that the encapsulated dye acted as the photosensitizer, exhibiting an apparent quantum yield (AQY) of 0.22% at 510 nm (the λmax of the dye). This study reports the first example of dye-sensitized ammonia decomposition and provides a new avenue for developing efficient and sustainable photocatalytic hydrogen production systems.

AB - The photocatalytic decomposition of ammonia to produce N2 and H2 was achieved using single-walled carbon nanotube (SWCNT) nanohybrids. The physical modification of ferrocene-dye-encapsulated CNTs by amphiphilic C60-dendron yielded nanohybrids with a dye/CNT/C60 coaxial heterojunction. Upon irradiation with visible light, an aqueous solution of NH3 and dye@CNT/C60-dendron nanohybrids produced both N2 and H2 in a stoichiometric ratio of 1/3. The action spectra of this reaction clearly demonstrated that the encapsulated dye acted as the photosensitizer, exhibiting an apparent quantum yield (AQY) of 0.22% at 510 nm (the λmax of the dye). This study reports the first example of dye-sensitized ammonia decomposition and provides a new avenue for developing efficient and sustainable photocatalytic hydrogen production systems.

KW - ammonia decomposition

KW - carbon nanotube

KW - dye sensitization

KW - fullerene

KW - hydrogen evolution

KW - photocatalyst

UR - http://www.scopus.com/inward/record.url?scp=85207668381&partnerID=8YFLogxK

U2 - 10.3390/catal14100715

DO - 10.3390/catal14100715

M3 - 学術論文

AN - SCOPUS:85207668381

SN - 2073-4344

VL - 14

JO - Catalysts

JF - Catalysts

IS - 10

M1 - 715

ER -

Photocatalytic Ammonia Decomposition Using Dye-Encapsulated Single-Walled Carbon Nanotubes

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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