Liquid-Phase Exfoliated Indium-Selenide Flakes and Their Application in Hydrogen Evolution Reaction

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Elisa PetroniFrancesco Bonaccorso

Abstract

Single- and few-layered InSe flakes are produced by the liquid-phase exfoliation of β-InSe single crystals in 2-propanol, obtaining stable dispersions with a concentration as high as 0.11 g L-1 . Ultracentrifugation is used to tune the morphology, i.e., the lateral size and thickness of the as-produced InSe flakes. It is demonstrated that the obtained InSe flakes have maximum lateral sizes ranging from 30 nm to a few micrometers, and thicknesses ranging from 1 to 20 nm, with a maximum population centered at ≈5 nm, corresponding to 4 Se-In-In-Se quaternary layers. It is also shown that no formation of further InSe-based compounds (such as In2 Se3 ) or oxides occurs during the exfoliation process. The potential of these exfoliated-InSe few-layer flakes as a catalyst for the hydrogen evolution reaction (HER) is tested in hybrid single-walled carbon nanotubes/InSe heterostructures. The dependence of the InSe flakes' morphologies, i.e., surface area and thickness, on the HER performances is highlighted, achieving the best efficiencies with small flakes offering predominant edge effects. The theoretical model unveils the origin of the catalytic efficiency of InSe flakes, and correlates the catalytic activity to the Se vacancies at th...Continue Reading

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Citations

Aug 11, 2018·Advanced Materials·Joohoon KangMark C Hersam
Jun 3, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·James FeltonAmalia Patané
Sep 29, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Donghui WangShi-Jing Gong
Sep 23, 2020·ACS Applied Materials & Interfaces·Gabriele BiancaFrancesco Bonaccorso
Jul 20, 2021·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Marilena I ZappiaFrancesco Bonaccorso
Dec 14, 2019·ACS Applied Materials & Interfaces·Han PanDechun Li
Dec 15, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Pieter SchiettecatteZeger Hens
Sep 3, 2021·The Journal of Physical Chemistry Letters·Danil W BoukhvalovAntonio Politano
Sep 9, 2021·Chemical Society Reviews·Sebastiano BellaniFrancesco Bonaccorso

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