Abstract
As a low-cost and promising electrocatalyst for hydrogen evolution reaction (HER), molybdenum disulfide (MoS 2 ) possesses both an inert basal plane and catalytically active edges. As a result, considerable efforts have been made to activate the MoS 2 basal plane for improving the HER activity. Herein, we first employed laser ablation in liquid to create plentiful sulfur (S)-vacancies in the basal plane of 2H-MoS 2 nanosheets under ambient conditions. The experimental measurements and theoretical calculations prove that S vacancies in the basal plane can serve as the additional active sites and optimize the free energy change for hydrogen adsorption (ΔG H∗ ) at the same time. As a result, in comparison with pristine MoS 2 (P-MoS 2 ), laser treated MoS 2 (L-MoS 2 ) realizes a significant improvement in the HER activity. Our work represents a facile method to enhance the catalytic performance of 2H-MoS 2 nanosheets and may help to guide the synthesis of other efficient two-dimensional metal chalcogenide catalysts.
| Original language | English |
|---|---|
| Pages (from-to) | 6999-7003 |
| Number of pages | 5 |
| Journal | ACS Sustainable Chemistry and Engineering |
| Volume | 7 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - Apr 2019 |
| Externally published | Yes |
Keywords
- Hydrogen evolution reaction
- Laser ablation
- Molybdenum disulfide
- Nanosheet
- Sulfur vacancies
ASJC Scopus subject areas
- General Chemistry
- Environmental Chemistry
- General Chemical Engineering
- Renewable Energy, Sustainability and the Environment
