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Issue 17, 2018
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Defect-rich (Co–CoS2)x@Co9S8 nanosheets derived from monomolecular precursor pyrolysis with excellent catalytic activity for hydrogen evolution reaction

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Abstract

The construction of defects in two-dimensional ultrathin nanosheets will improve the activity of transition metal-based catalysts. CoSx-based electrocatalysts have attracted increasing attention because of their low cost. In this article, defect-rich, Co9S8-based ultrathin nanosheets were synthesized through direct pyrolysis of cobalt dibutyl dithiocarbamate in organic amine solvents. Edge, cavity and dislocation defects exist in the as-obtained nanosheets. The nanosheets with thickness of 4–6 nm are composed mainly of Co9S8, with small amounts of Co and CoS2. The defects on Co9S8-based nanosheets were controlled by tuning the coordination solvents and pyrolysis parameters. The optimized nanosheets with defective structures have superior catalytic activity for hydrogen evolution reaction in acid media, with a low onset potential of 228 mV and Tafel slope of 51.0 mV dec−1. The catalyst displays robust stability without obvious degradation after being employed over 16 h. The pyrolysis of monomolecular precursors in an organic system provides a new way to construct transition metal compound-based, defect-rich nanostructures for electrocatalysis and energy storage.

Graphical abstract: Defect-rich (Co–CoS2)x@Co9S8 nanosheets derived from monomolecular precursor pyrolysis with excellent catalytic activity for hydrogen evolution reaction

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Publication details

The article was received on 03 Feb 2018, accepted on 03 Apr 2018 and first published on 05 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01163J
Citation: J. Mater. Chem. A, 2018,6, 7977-7987
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    Defect-rich (Co–CoS2)x@Co9S8 nanosheets derived from monomolecular precursor pyrolysis with excellent catalytic activity for hydrogen evolution reaction

    X. Zhang, Y. Liu, J. Gao, G. Han, M. Hu, X. Wu, H. Cao, X. Wang and B. Li, J. Mater. Chem. A, 2018, 6, 7977
    DOI: 10.1039/C8TA01163J

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