title: Defects Engineered Monolayer MoS2 for Improved Hydrogen Evolution Reaction.
abstract: MoS2 is a promising and low-cost material for electrochemical hydrogen production due to its high activity and stability during the reaction. However, the efficiency of hydrogen production is limited by the amount of active sites, for example, edges, in MoS2. Here, we demonstrate that oxygen plasma exposure and hydrogen treatment on pristine monolayer MoS2 could introduce more active sites via the formation of defects within the monolayer, leading to a high density of exposed edges and a significant improvement of the hydrogen evolution activity. These as-fabricated defects are characterized at the scale from macroscopic continuum to discrete atoms. Our work represents a facile method to increase the hydrogen production in electrochemical reaction of MoS2 via defect engineering, and helps to understand the catalytic properties of MoS2.
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.
authors.forename: Gonglan
authors.initials: G
authors.lastname: Ye
authors.affiliation: Department of Chemistry, Rice University , Houston, Texas 77005, United States.
authors.forename: Yongji
authors.initials: Y
authors.lastname: Gong
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Lab , Oak Ridge, Tennessee 37831, United States.|Department of Physics and Astronomy, Vanderbilt University , Nashville, Tennessee 37235, United States.
authors.forename: Junhao
authors.initials: J
authors.lastname: Lin
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.
authors.forename: Bo
authors.initials: B
authors.lastname: Li
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.
authors.forename: Yongmin
authors.initials: Y
authors.lastname: He
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Lab , Oak Ridge, Tennessee 37831, United States.|Department of Physics and Astronomy, Vanderbilt University , Nashville, Tennessee 37235, United States.
authors.forename: Sokrates T
authors.initials: ST
authors.lastname: Pantelides
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Lab , Oak Ridge, Tennessee 37831, United States.
authors.forename: Wu
authors.initials: W
authors.lastname: Zhou
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.
authors.forename: Robert
authors.initials: R
authors.lastname: Vajtai
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.|Department of Chemistry, Rice University , Houston, Texas 77005, United States.
authors.forename: Pulickel M
authors.initials: PM
authors.lastname: Ajayan
keywords: Monolayer MoS2; defects; hydrogen evolution reaction; hydrogen treatment; oxygen plasma