Edge-oriented MoS 2 supported on nickel/carbon core-shell nanospheres for enhanced hydrogen evolution reaction performance

Yin Wang, Zegao Wang, Qian Yang, An Hua, Song Ma*, Zhidong Zhang, Mingdong Dong

*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Abstract

Molybdenum disulfide (MoS 2 ), as one of the important two-dimensional (2D) transition metal dichalcogenides (TMDs), has shown huge potential for catalytic applications. However, both poor conductivity and insufficient active edge sites are the main obstacles limiting MoS 2 as a highly efficient electrocatalyst. In this study, a great number of edge-oriented 2D-MoS 2 nanosheets were synthesized on the surface of nickel/carbon (Ni/C) core-shell spheres. The edge-oriented MoS 2 nanosheets not only increase the number of exposed active edges, but also promote the charge transfer between active edges and Ni/C spheres. The electrochemical results show that nickel/carbon/MoS 2 (Ni/C/MoS 2 ) nanospheres deliver the highest activity with a Tafel slope as small as 55.5 mV per decade and an overpotential as small as 275 mV at a current density of 10 mA cm −2 . Furthermore, this Ni/C/MoS 2 core-shell architecture shows good stability and durability by the proof of 2000 cycles of cyclic voltammetry followed by a 9000 s i-t curve test. The method provides an opportunity to further improve the electrochemical catalysis of MoS 2 to produce hydrogen for energy storage.

OriginalsprogEngelsk
TidsskriftNew Journal of Chemistry
Vol/bind43
Nummer16
Sider (fra-til)6146-6152
Antal sider7
ISSN1144-0546
DOI
StatusUdgivet - 2019

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