☆ 4.7 Article

Dopamine adsorption precursor enables N-doped carbon sheathing of MoS2 nanoflowers for all-around enhancement of supercapacitor performance

JOURNAL OF ALLOYS AND COMPOUNDS (2017)

Journal

JOURNAL OF ALLOYS AND COMPOUNDS

Volume 693, Issue -, Pages 955-963

Publisher

ELSEVIER SCIENCE SA

DOI: 10.1016/j.jallcom.2016.09.173

Keywords

MoS2 nanoflower; Nitrogen-doped carbon; Dopamine self-polymerization; Supercapacitors

Categories

Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering

Funding

National Natural Science Foundation of China [21171060]
Program for New Century Excellent Talents in University [NCET-12-0643]
South China Normal University [2013kyjj019]

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Abstract

The application of MoS2 in renewable energy-storage has been hampered by its low conductivity and restacking tendency. In this study, we demonstrate a facile and simple synthesis of MoS2 nanoflowers free from re-stacking and demonstrate that further encapsulating the nanoflowers with a fine N-doped carbon shell enhances conductivity through the self-polymerization of dopamine. This class of nitrogen-doped carbon-encapsulated MoS2 composites (MSCNs) was systematically optimised by adjusting nitrogen-doped carbon ratios. The composite with a mass fraction of approximately 86% MoS2 and approximately 14% carbon content (named MSCN-1) exhibited excellent capacitive performance. In comparison to the specific capacitance of MoS2 (169 F g(-1) at 1 A g(-1) and 85.30% retained capacitance over 6000 cycles), MSCN-1 based electrodes showed improved performance, delivering specific capacitance up to 276 F g(-1) at 1 A g(-1) and 90.59% retained capacitance over 6000 cycles. The significantly enhanced electrochemical performance of MSCN-1 was primarily due to MoS2 and partly due to N-doped carbon. Taken together, these findings provide strong synergistic effects in this condition. (C) 2016 Elsevier B.V. All rights reserved.

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