Nitrogen-doped carbon-coated molybdenum disulfide nanosheets for high-performance supercapacitor

초록

Although exfoliated MoS2 sheets have recently demonstrated their great potential for use as electrodes for supercapacitors, they suffer from poor intrinsic electrical conductivity and strong tendency for intersheet aggregation. Here, we develop a synthetic method for preparation of N-doped carbon-coated MoS2 (NC-MoS2) nanosheets composed of coating of polydopamine and a post carbonization process. Construction of carbon layers on the MoS2 surface enables effective prevention of sheet aggregation and provide a rapid pathway for electron transfer. As-prepared NC-MoS2 materials are then characterized by electrochemical measurements to demonstrate the superior performance of the supercapacitor electrodes. The NC-MoS2 electrode exhibits improved electrochemical performance relative to the exfoliated MoS2 sheets, with a high specific capacitance (158 Fg(-1)), high rate capability (83% retention), and good cycling life (89% retention) during 1000 cycles. (C) 2015 Elsevier B.V. All rights reserved.

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