Hydrazine-assisted formation of ultrathin MoS2 nanosheets for enhancing their co-catalytic activity in photocatalytic hydrogen evolution

D. Amaranatha Reddy, Hanbit Park, Sangyeob Hong, D. Praveen Kumar, Tae Kyu Kim

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

We demonstrate a simple and effective approach to modulate the active sites and electronic properties of MoS2 using hydrazine assisted liquid exfoliation for enhancing its co-catalytic activity in photocatalytic hydrogen evolution. The resulting ultrathin MoS2 (HUT-MoS2) nanosheets integrated on CdS nanorods, from hydrazine assisted liquid exfoliation, exhibit an excellent hydrogen evolution rate of 238 mmol g-1 h-1 under natural sunlight, which is the best performance ever reported for CdS/MoS2-based nanostructures. The apparent quantum yield reached 53.3% at 425 nm in 5 h. The hydrogen evolution rate was influenced by several experimental parameters, such as the photocatalyst dose, sacrificial donor concentration, and amount of co-catalyst on CdS, which were investigated in detail. More importantly, the CdS/HUT-MoS2 nanocomposite showed remarkable photo-stability for up to 100 h. The excellent hydrogen evolution performance and stability may be due to the unique structure and properties of HUT-MoS2 nanosheets, which significantly boosted the charge transportation between CdS and HUT-MoS2 and suppressed charge recombination, thus favoring the involvement of more electrons in hydrogen production. We believe that the presented nanohybrid design strategy and the implementation of this noble metal-free co-catalyst enable the development of inexpensive robust co-catalysts for sustainable hydrogen production to satisfy the growing global energy demand and address environmental problems.

Original languageEnglish
Pages (from-to)6981-6991
Number of pages11
JournalJournal of Materials Chemistry A
Volume5
Issue number15
DOIs
Publication statusPublished - 2017 Jan 1

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hydrazine
Nanosheets
Hydrazine
Hydrogen
Catalyst activity
Hydrogen production
Catalysts
Transportation charges
Liquids
Quantum yield
Photocatalysts
Precious metals
Nanorods
Electronic properties
Nanostructures
Nanocomposites
Electrons

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

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title = "Hydrazine-assisted formation of ultrathin MoS2 nanosheets for enhancing their co-catalytic activity in photocatalytic hydrogen evolution",
abstract = "We demonstrate a simple and effective approach to modulate the active sites and electronic properties of MoS2 using hydrazine assisted liquid exfoliation for enhancing its co-catalytic activity in photocatalytic hydrogen evolution. The resulting ultrathin MoS2 (HUT-MoS2) nanosheets integrated on CdS nanorods, from hydrazine assisted liquid exfoliation, exhibit an excellent hydrogen evolution rate of 238 mmol g-1 h-1 under natural sunlight, which is the best performance ever reported for CdS/MoS2-based nanostructures. The apparent quantum yield reached 53.3{\%} at 425 nm in 5 h. The hydrogen evolution rate was influenced by several experimental parameters, such as the photocatalyst dose, sacrificial donor concentration, and amount of co-catalyst on CdS, which were investigated in detail. More importantly, the CdS/HUT-MoS2 nanocomposite showed remarkable photo-stability for up to 100 h. The excellent hydrogen evolution performance and stability may be due to the unique structure and properties of HUT-MoS2 nanosheets, which significantly boosted the charge transportation between CdS and HUT-MoS2 and suppressed charge recombination, thus favoring the involvement of more electrons in hydrogen production. We believe that the presented nanohybrid design strategy and the implementation of this noble metal-free co-catalyst enable the development of inexpensive robust co-catalysts for sustainable hydrogen production to satisfy the growing global energy demand and address environmental problems.",
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Hydrazine-assisted formation of ultrathin MoS2 nanosheets for enhancing their co-catalytic activity in photocatalytic hydrogen evolution. / Reddy, D. Amaranatha; Park, Hanbit; Hong, Sangyeob; Kumar, D. Praveen; Kim, Tae Kyu.

In: Journal of Materials Chemistry A, Vol. 5, No. 15, 01.01.2017, p. 6981-6991.

Research output: Contribution to journalArticle

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AU - Reddy, D. Amaranatha

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AU - Kim, Tae Kyu

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AB - We demonstrate a simple and effective approach to modulate the active sites and electronic properties of MoS2 using hydrazine assisted liquid exfoliation for enhancing its co-catalytic activity in photocatalytic hydrogen evolution. The resulting ultrathin MoS2 (HUT-MoS2) nanosheets integrated on CdS nanorods, from hydrazine assisted liquid exfoliation, exhibit an excellent hydrogen evolution rate of 238 mmol g-1 h-1 under natural sunlight, which is the best performance ever reported for CdS/MoS2-based nanostructures. The apparent quantum yield reached 53.3% at 425 nm in 5 h. The hydrogen evolution rate was influenced by several experimental parameters, such as the photocatalyst dose, sacrificial donor concentration, and amount of co-catalyst on CdS, which were investigated in detail. More importantly, the CdS/HUT-MoS2 nanocomposite showed remarkable photo-stability for up to 100 h. The excellent hydrogen evolution performance and stability may be due to the unique structure and properties of HUT-MoS2 nanosheets, which significantly boosted the charge transportation between CdS and HUT-MoS2 and suppressed charge recombination, thus favoring the involvement of more electrons in hydrogen production. We believe that the presented nanohybrid design strategy and the implementation of this noble metal-free co-catalyst enable the development of inexpensive robust co-catalysts for sustainable hydrogen production to satisfy the growing global energy demand and address environmental problems.

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