title: Pure and stable metallic phase molybdenum disulfide nanosheets for hydrogen evolution reaction.
abstract: Metallic-phase MoS2 (M-MoS2) is metastable and does not exist in nature. Pure and stable M-MoS2 has not been previously prepared by chemical synthesis, to the best of our knowledge. Here we report a hydrothermal process for synthesizing stable two-dimensional M-MoS2 nanosheets in water. The metal-metal Raman stretching mode at 146 cm(-1) in the M-MoS2 structure, as predicted by theoretical calculations, is experimentally observed. The stability of the M-MoS2 is associated with the adsorption of a monolayer of water molecules on both sides of the nanosheets, which reduce restacking and prevent aggregation in water. The obtained M-MoS2 exhibits excellent stability in water and superior activity for the hydrogen evolution reaction, with a current density of 10 mA cm(-2) at a low potential of -175 mV and a Tafel slope of 41 mV per decade.
authors: Department of Physics and Astronomy, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, Arkansas 72204, USA.
authors: Xiumei
authors: X
authors: Geng
authors: Department of Physics and Astronomy, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, Arkansas 72204, USA.
authors: Weiwei
authors: W
authors: Sun
authors: Department of Physics and Astronomy, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, Arkansas 72204, USA.
authors: Wei
authors: W
authors: Wu
authors: Department of Physics, University at Buffalo, Buffalo, New York 14260, USA.
authors: Benjamin
authors: B
authors: Chen
authors: Department of Physics and Astronomy, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, Arkansas 72204, USA.
authors: Alaa
authors: A
authors: Al-Hilo
authors: Institute for Nanoscale Materials Science and Engineering, University of Arkansas, Fayetteville, Arkansas 72701, USA.
authors: Mourad
authors: M
authors: Benamara
authors: Department of Mechanical and Industrial Engineering, Northeastern University, Boston, Massachusetts 02115, USA.
authors: Hongli
authors: H
authors: Zhu
authors: Department of Physics and Astronomy, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, Arkansas 72204, USA.
authors: Fumiya
authors: F
authors: Watanabe
authors: Department of Physics and Materials Science, University of Memphis, Memphis, Tennessee 38152, USA.
authors: Jingbiao
authors: J
authors: Cui
authors: Department of Physics and Astronomy, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, Arkansas 72204, USA.
authors: Tar-Pin
authors: TP
authors: Chen