Unilamellar Metallic MoS<inf>2</inf>/Graphene Superlattice for Efficient Sodium Storage and Hydrogen Evolution

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Journal Article
ACS Energy Letters, 2018, 3 (4), pp. 997 - 1005
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© 2018 American Chemical Society. Unilamellar metallic nanosheets possess superiority for electrochemical energy storage and conversion applications compared to the few-layered bulk and semiconducting counterparts. Here, we report the utilization of unilamellar metallic 1T phase MoS2 nanosheets for efficient sodium storage and hydrogen evolution through a MoS2/graphene superlattice. The superlattice-like assembly composed of alternately restacked unilamellar MoS2 and modified reduced graphene oxide nanosheets was prepared by a facile solution-phase direct restacking method. As an anode for sodium storage, the MoS2/graphene superlattice anode exhibited an excellent rate capability of ∼240 mA h g-1 at 51.2 A g-1 and a stable reversible capacity of ∼380 mA h g-1 after 1000 cycles at 10 A g-1. In addition, a low onset potential of ∼88 mV and a small Tafel slope of 48.7 mV decade-1 were attained for the hydrogen evolution reaction. Our findings are important for further developing the potential of 2D nanosheets for energy storage and conversion.
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