In Situ Generated Amorphous Molybdenum Sulfide on Reduced Graphene Oxide Nanocomposite Catalyst for Hydrogen Evolution in a Biphasic Liquid System

In situ deposition of catalysts are drawing attention to the liquid/liquid interfaces by using raw materials for the energy conversion reactions such as hydrogen evolution and oxygen reduction. Herein, in situ generation of amorphous molybdenum sulfide on reduced graphene oxide (rGO/MoSx) is investi...

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Bibliographic Details
Published in:ChemCatChem 2021-12, Vol.13 (24), p.5203-5209
Main Authors: Aslan, Emre, Yanalak, Gizem, Patir, Imren Hatay
Format: Article
Language:English
Subjects:
Ammonium molybdate
biphasic catalysis
Catalysts
Catalytic activity
electrodeposition
Energy conversion
Graphene
hydrogen evolution
Hydrogen evolution reactions
Liquid-liquid interfaces
Molybdenum
Nanocomposites
Raw materials
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Summary:In situ deposition of catalysts are drawing attention to the liquid/liquid interfaces by using raw materials for the energy conversion reactions such as hydrogen evolution and oxygen reduction. Herein, in situ generation of amorphous molybdenum sulfide on reduced graphene oxide (rGO/MoSx) is investigated in the hydrogen evolution reaction (HER) by decamethylferrocene electron donor at the liquid/liquid interfaces by using (NH4)2MoS4 and graphene oxide precursors in the aqueous phase. rGO/MoSx catalyst shows better catalytic activity than the uncatalyzed reaction and free‐MoSx, which increase the HER rate 57‐ and 1.7‐fold, respectively. The enhanced catalytic activity of rGO/MoSx catalyst is related to the increased surface area, active sites and conductivity of rGO. The catalytic activity of rGO/MoSx are examined by four‐electrode voltammetry and also two‐phase reactions. The obtained rGO/MoSx catalyst are characterized in detail by structural and morphological techniques. Biphasic catalysis: Spontaneous reduction process is explored for the preparation of template‐free in situ MoSx grown on rGO (rGO/MoSx) during the catalytic HER at the liquid/liquid interface by using ammonium tetrathiomolybdate and graphene oxide precursors in the aqueous phase, which both are reduced by organic sacrificial agent decamethylferrocene. The rGO/MoSx nanocomposite is displayed 1.7‐fold more efficiency than that of free‐MoSx for the catalytic hydrogen evolution according to kinetic calculations. The formation mechanism of both rGO/MoSx and molecular hydrogen are presented.
ISSN:1867-3880
1867-3899
DOI:10.1002/cctc.202100871