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Issue 14, 2017
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Polymer-confined growth of perforated MoSe2 single-crystals on N-doped graphene toward enhanced hydrogen evolution

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Abstract

The edge and corner atoms of 2D transition metal dichalcogenides (TMDCs) are the main electrocatalytically active sites for electrochemical reaction. Here, we demonstrate an approach to generate abundant edge/corner atoms in molybdenum diselenide (MoSe2) nanocrystals supported by nitrogen-doped graphene (NG) which consequently leads to significantly enhanced hydrogen evolution reaction (HER) activity. These structures were fabricated by firstly absorbing the Mo-containing precursor within polymer-functionalized graphene oxide, then selenized to obtain MoSe2 nanocrystals on the surface, and finally H2 etching was performed to form perforated structures. The use of a functional polymer as an absorption matrix efficiently mitigates aggregation which allows us to obtain MoSe2 single-crystals of ∼150 nm in lateral dimension, while maintaining high MoSe2 loading. We observed a remarkably enhanced electrocatalytic activity resulting from a significantly increased abundance of edge/corner atoms in hydrogen evolution measurements. Specifically, with this perforated MoSe2/NG-modified cathode, current densities of −1 and −10 mA cm−2 were realized with the overpotentials of only 30 and 106 mV, along with a small Tafel slope of 57 mV dec−1 and large exchange current density of 127.4 μA cm−2 in 0.5 M H2SO4. Such an efficient strategy also opens doors for the unparalleled design and fabrication of TMDC-based nanocomposites for electrochemical applications.

Graphical abstract: Polymer-confined growth of perforated MoSe2 single-crystals on N-doped graphene toward enhanced hydrogen evolution

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Publication details

The article was received on 16 Jan 2017, accepted on 09 Mar 2017 and first published on 15 Mar 2017


Article type: Communication
DOI: 10.1039/C7NR00354D
Citation: Nanoscale, 2017,9, 4652-4659
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    Polymer-confined growth of perforated MoSe2 single-crystals on N-doped graphene toward enhanced hydrogen evolution

    M. Zhuang, Y. Ding, X. Ou and Z. Luo, Nanoscale, 2017, 9, 4652
    DOI: 10.1039/C7NR00354D

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