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

79 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

All Science Journal Classification (ASJC) codes

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

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