Facile synthesis of a Ag/MoS<inf>2</inf> nanocomposite photocatalyst for enhanced visible-light driven hydrogen gas evolution

A. J. Cheah, W. S. Chiu, P. S. Khiew, H. Nakajima, T. Saisopa, P. Songsiriritthigul, Shahidan Radiman, Muhammad Azmi Abdul Hamid

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Abstract

The current study reports the facile synthesis of a Ag/MoS<inf>2</inf> nanocomposite photocatalyst for visible-light driven hydrogen gas evolution. The MoS<inf>2</inf> nanoflakes were hydrothermally prepared and then decorated with Ag nanoparticles (NPs) by a simple chemical reduction process at room temperature. Detailed characterizations were carried out to probe the physical structure and properties of the as-synthesized nanocomposite. The nanocomposite shows enhanced visible-light absorption and pronounced quenching of photoluminescence intensity as compared to that of pure MoS<inf>2</inf>. The photocatalytic hydrogen gas evolution experiments reveal that the Ag NPs can act as an efficient co-catalyst for the MoS<inf>2</inf> nanoflakes and subsequently improve the hydrogen gas evolution rate. Ag-loading dependent photocatalytic tests indicate that the 20 wt%-Ag/MoS<inf>2</inf> nanocomposite exhibits the highest photocatalytic activity with a hydrogen gas evolution of 179.5 μmol H<inf>2</inf> g<inf>cat</inf><sup>-1</sup>, which is enhanced by 95% compared to that of commercial MoS<inf>2</inf> nanopowder (92.0 μmol H<inf>2</inf> g<inf>cat</inf><sup>-1</sup>). The possible mechanisms that contribute to the improvement of the visible-light driven photocatalytic performance for the nanocomposite are proposed.

Original languageEnglish
Pages (from-to)4133-4143
Number of pages11
JournalCatalysis Science and Technology
Volume5
Issue number8
DOIs
Publication statusPublished - 1 Aug 2015

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Photocatalysts
Hydrogen
Nanocomposites
Gases
Nanoparticles
Light absorption
Quenching
Photoluminescence
Catalysts
Experiments
Temperature

ASJC Scopus subject areas

  • Catalysis

Cite this

Facile synthesis of a Ag/MoS<inf>2</inf> nanocomposite photocatalyst for enhanced visible-light driven hydrogen gas evolution. / Cheah, A. J.; Chiu, W. S.; Khiew, P. S.; Nakajima, H.; Saisopa, T.; Songsiriritthigul, P.; Radiman, Shahidan; Abdul Hamid, Muhammad Azmi.

In: Catalysis Science and Technology, Vol. 5, No. 8, 01.08.2015, p. 4133-4143.

Research output: Contribution to journalArticle

Cheah, A. J. ; Chiu, W. S. ; Khiew, P. S. ; Nakajima, H. ; Saisopa, T. ; Songsiriritthigul, P. ; Radiman, Shahidan ; Abdul Hamid, Muhammad Azmi. / Facile synthesis of a Ag/MoS<inf>2</inf> nanocomposite photocatalyst for enhanced visible-light driven hydrogen gas evolution. In: Catalysis Science and Technology. 2015 ; Vol. 5, No. 8. pp. 4133-4143.
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