Understanding the air stability of defective MoS2 and the oxidation effect on the surface HER activity. (28th July 2021)

• Record Type: Journal Article
• Authors: Zhou, Wenyu; Dong, Lichun; Tan, Luxi; Tang, Qing
• Is Part Of: Journal of physics. Volume 33:Number 39(2021)
• Publication Date: 2021-07-28
• Subjects: defective MoS2 -- defect concentration -- air stability -- oxidation -- HER activity; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ac13fb
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: The defective single layer MoS2 (SL-MoS2 ) with high defect concentrations has shown promising electrocatalytic potential, but it is also highly reactive with gas molecules. The study of electro-chemical activity on gas doped defective SL-MoS2 is of importance yet still scarcely discussed. Herein, we performed density functional theory calculations to study the adsorption and chemical activity of four major air molecules on the defective SL-MoS2 under different defect concentrations, and evaluated the influence on the hydrogen evolution reaction activity. The N2 and CO2 molecules are in physisorption states, H2 O molecule is in molecular chemisorption state, while O2 can be strongly captured and dissociated into atomic O *, which repair the S-vacancy and form O-doped structure. Further study showed that compared to the inert S surface of pure MoS2, the O incorporation greatly enhance the surface reactivity. Using H adsorption as the test probe, the adsorption of H becomes stronger with the increasing oxygen concentration. We further unravel the electronic origins underlying the catalytic activity. The lowest unoccupied electronic states are shown to correlate linearly with the activity, and thus can be used as an electronic descriptor to characterize the electrocatalytic activity.