One-pot synthesis of MoS2(1−x)Se2xon N-doped reduced graphene oxide: tailoring chemical and structural properties for photoenhanced hydrogen evolution reaction

Dario Mosconi, Tomasz Kosmala, Marco Lunardon, Alevtina Neyman, Maya Bar-Sadan, Stefano Agnoli, Gaetano Granozzi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In this work we designed a one-pot solvothermal synthesis of MoS2(1−x)Se2xnanosheets directly grown on N-doped reduced graphene oxide (hereafter N-rGO). We optimized the synthesis conditions to control the Se : S ratio, with the aim of tailoring the optoelectronic properties of the resulting nanocomposites for their use as electro- and photoelectro-catalysts in the hydrogen evolution reaction (HER). The synthesis protocol made use of ammonium tetrathiomolybdate (ATM) as MoS2precursor and dimethyl diselenide (DMDSe) as selenizing agent. By optimizing growth conditions and post-annealing treatments, we produced either partially amorphous or highly crystalline chalcogen-defective electrocatalysts. All samples were tested for the HER in acidic environment, and the best performing among them, for the photoassisted HER. In low crystallinity samples, the introduction of Se is not beneficial for promoting the catalytic activity, and MoS2/N-rGO was the most active electrocatalyst. On the other hand, after the post-annealing treatment and the consequent crystallization of the materials, the best HER performance was obtained for the sample withx= 0.38, which also showed the highest enhancement upon light irradiation.

Original languageEnglish
Pages (from-to)4830-4840
Number of pages11
JournalNanoscale Advances
Volume2
Issue number10
DOIs
StatePublished - 1 Oct 2020

ASJC Scopus subject areas

  • Engineering (all)
  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Materials Science (all)
  • Chemistry (all)

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