title: Two-Dimensional Water-Coupled Metallic MoS2with Nanochannels for Ultrafast Supercapacitors.
abstract: MoS2is a promising electrode material for energy storage. However, the intrinsic multilayer pure metallic MoS2(M-MoS2) has not been investigated for use in supercapacitors. Here, an ultrafast rate supercapacitor with extraordinary capacitance using a multilayer M-MoS2-H2O system is first investigated. Intrinsic M-MoS2with a monolayer of water molecules covering both sides of nanosheets is obtained through a hydrothermal method with water as solvent. The super electrical conductivity of the as-prepared pure M-MoS2is beneficial to electron transport for high power supercapacitor. Meanwhile, nanochannels between the layers of M-MoS2-H2O with a distance of ∼1.18 nm are favorable for increasing the specific space for ion diffusion and enlarging the surface area for ion adsorption. By virtue of this, M-MoS2-H2O reaches a high capacitance of 380 F/g at a scan rate of 5 mV/s and still maintains 105 F/g at scan rate of 10 V/s. Furthermore, the specific capacitance of the symmetric supercapacitor based on M-MoS2-H2O electrodes retain a value as high as 249 F/g under 50 mV/s. These findings suggest that multilayered M-MoS2-H2O system with ion accessible large nanochannels and efficient charge transport provide an efficient energy storage strategy for ultrafast supercapacitors.
authors.affiliation: Department of Mechanical and Industrial Engineering, Northeastern University , Boston, Massachusetts 02115, United States.
authors.forename: Xiumei
authors.initials: X
authors.lastname: Geng
authors.affiliation: Department of Mechanical and Industrial Engineering, Northeastern University , Boston, Massachusetts 02115, United States.
authors.forename: Yelong
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Mechanical and Industrial Engineering, Northeastern University , Boston, Massachusetts 02115, United States.
authors.forename: Yang
authors.initials: Y
authors.lastname: Han
authors.affiliation: Department of Mechanical and Industrial Engineering, Northeastern University , Boston, Massachusetts 02115, United States.
authors.forename: Jingxiao
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Mechanical and Industrial Engineering, Northeastern University , Boston, Massachusetts 02115, United States.
authors.forename: Lei
authors.initials: L
authors.lastname: Yang
authors.affiliation: Institute for Nanoscale Materials Science and Engineering, University of Arkansas , Fayetteville, Arkansas 72701, United States.
authors.forename: Mourad
authors.initials: M
authors.lastname: Benamara
authors.affiliation: Department of Mechanical and Industrial Engineering, Northeastern University , Boston, Massachusetts 02115, United States.
authors.forename: Liao
authors.initials: L
authors.lastname: Chen
authors.affiliation: Department of Mechanical and Industrial Engineering, Northeastern University , Boston, Massachusetts 02115, United States.
authors.forename: Hongli
authors.identifier: 0000-0003-1733-4333
authors.initials: H
authors.lastname: Zhu
keywords: M-MoS2−H2O system; Metallic MoS2; high electrical conductivity; hydrophilic; nanochannels