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Issue 48, 2019
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Interface engineering: few-layer MoS2 coupled to a NiCo-sulfide nanosheet heterostructure as a bifunctional electrocatalyst for overall water splitting

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Abstract

Inexpensive and highly efficient bifunctional electrocatalysts are vital for water splitting. Herein, free-standing heterogeneous MoS2/NiCoS nanosheets as a bifunctional electrocatalyst for overall water splitting are designed. The abundant heterogeneous interfaces in MoS2/NiCoS, enriched holes and few-layer structure of MoS2 can not only provide enriched active sites but also accelerate electron/ion transfer. Consequently, the optimized MoS2/NiCoS heterostructure achieves a low overpotential of 189 mV for the hydrogen evolution reaction (HER) and 290 mV for the oxygen evolution reaction (OER) at 10 mA cm−2 in an alkaline electrolyte. In particular, in a two-electrode electrolyzer assembly, the MoS2/NiCoS heterostructure nanosheets can afford a current density of 10 mA cm−2 at a voltage of 1.50 V, serving as one of the best water-splitting electrocatalysts to date. This work provides a feasible strategy to construct efficient free-standing heterogeneous bifunctional electrocatalysts for overall water splitting.

Graphical abstract: Interface engineering: few-layer MoS2 coupled to a NiCo-sulfide nanosheet heterostructure as a bifunctional electrocatalyst for overall water splitting

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Publication details

The article was received on 24 Sep 2019, accepted on 13 Nov 2019 and first published on 15 Nov 2019


Article type: Paper
DOI: 10.1039/C9TA10547F
J. Mater. Chem. A, 2019,7, 27594-27602

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    Interface engineering: few-layer MoS2 coupled to a NiCo-sulfide nanosheet heterostructure as a bifunctional electrocatalyst for overall water splitting

    C. Qin, A. Fan, X. Zhang, S. Wang, X. Yuan and X. Dai, J. Mater. Chem. A, 2019, 7, 27594
    DOI: 10.1039/C9TA10547F

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