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Title: Strong charge transfer at 2H-1T phase boundary of MoS₂ for superb high-performance energy storage
Authors: Ke, Qingqing
Zhang, Xiao
Zang, Wenjie
Elshahawy, Abdelnaby M.
Hu, Yating
He, Qiyuan
Pennycook, Stephen J.
Cai, Yongqing
Wang, John
Keywords: Engineering::Materials
Issue Date: 2019
Source: Ke, Q., Zhang, X., Zang, W., Elshahawy, A. M., Hu, Y., He, Q., Pennycook, S. J., Cai, Y. & Wang, J. (2019). Strong charge transfer at 2H-1T phase boundary of MoS₂ for superb high-performance energy storage. Small, 15(21), 1900131-.
Project: MOE2016-T2-2-138
ARC 26/13, No. MOE2013-T2-1-034
ARC 19/15, No. MOE2014-T2-2-093
Journal: Small
Abstract: Transition metal dichalcogenides exhibit several different phases (e.g., semiconducting 2H, metallic 1T, 1T') arising from the collective and sluggish atomic displacements rooted in the charge-lattice interaction. The coexistence of multiphase in a single sheet enables ubiquitous heterophase and inhomogeneous charge distribution. Herein, by combining the first-principles calculations and experimental investigations, a strong charge transfer ability at the heterophase boundary of molybdenum disulfide (MoS₂) assembled together with graphene is reported. By modulating the phase composition in MoS₂, the performance of the nanohybrid for energy storage can be modulated, whereby remarkable gravimetric and volumetric capacitances of 272 F g⁻¹ and 685 F cm⁻³ are demonstrated. As a proof of concept for energy application, a flexible solid-state asymmetric supercapacitor is constructed with the MoS2 -graphene heterolayers, which shows superb energy and power densities (46.3 mWh cm⁻³ and 3.013 W cm⁻³, respectively). The present work demonstrates a new pathway for efficient charge flow and application in energy storage by engineering the phase boundary and interface in 2D materials of transition metal dichalcogenides.
ISSN: 1613-6810
DOI: 10.1002/smll.201900131
Rights: © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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