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Thangasamy, Pitchai,Oh, Saewoong,Nam, Sanghee,Oh, Il-Kwon Elsevier 2020 Carbon Vol.158 No.-
<P><B>Abstract</B></P> <P>In this study, we report a rose-like MoS<SUB>2</SUB> and <I>in-situ</I> exfoliated WS<SUB>2</SUB> nanoarchitecture supported on carbon nanotube networks for enhanced hydrogen evolution reaction. The interlayer expansion of MoS<SUB>2</SUB> was carried out during <I>in-situ</I> exfoliation of WS<SUB>2</SUB> nanosheets under a solvothermal process based on the ethanol-water mixture of sodium molybdate dihydrate and organosulfur chelating agent. Then, the MoS<SUB>2</SUB>-WS<SUB>2</SUB> nanostructures are attached with carbon nanotubes (CNTs) to obtain the MoS<SUB>2</SUB>-WS<SUB>2</SUB>-CNTs nanoarchitectures where the interlayer expanded rose-like MoS<SUB>2</SUB> nanostructures and the delaminated WS<SUB>2</SUB> nanosheets are strongly associated with the electrically conductive carbon nanotubes, leading to a strong synergistic interaction among MoS<SUB>2</SUB>, WS<SUB>2</SUB>, and CNTs. Hence, the fabricated MoS<SUB>2</SUB>-WS<SUB>2</SUB>-CNTs nanoarchitectures delivered superior electrocatalytic activity towards the hydrogen evolution reaction (HER), yielding a current density of 10 mA cm<SUP>−2</SUP> at a low overpotential of ∼212 mV with a Tafel slope of 50 mV dec<SUP>−1</SUP>. Such superior HER electrocatalytic activity is due to the existence of abundant catalytic active sites in the both rose-like MoS<SUB>2</SUB> nanostructures with large interlayer spacing of ∼9.9 Å and exfoliated WS<SUB>2</SUB> nanosheets with more edge sites, and facile electron transfer between conductive substrate and electrocatalytically active MoS<SUB>2</SUB>/WS<SUB>2</SUB> materials through CNTs conducting channel.</P> <P><B>Graphical abstract</B></P> <P>A one-step solvothermal method was demonstrated for the simultaneous synthesis of interlayer expanded MoS<SUB>2</SUB> nano-rose and few layer WS<SUB>2</SUB> nanosheets with uniform CNTs distribution for electrochemical hydrogen evolution reaction.</P> <P>[DISPLAY OMISSION]</P>