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Published on: December 6, 2021
Oxygen-Incorporated MoS2 Nanosheets with Expanded Interlayers for Hydrogen Evolution Reaction and Pseudocapacitor
Jiang Zhou1, Guozhao Fang1, Anqiang Pan1
1School of Materials Science and Engineering, and ‡Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University , Changsha 410083, Hunan China.
Engineered molybdenum disulfide (MoS2) nanosheets with expanded interlayers show enhanced hydrogen evolution and pseudocapacitor performance. This structural modification strategy offers a pathway for optimizing transition-metal dichalcogenides for energy applications.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Two-dimensional transition-metal dichalcogenides (TMDs) are of significant research interest for energy applications.
- Structural engineering of molybdenum disulfide (MoS2) is crucial for improving its performance.
Purpose of the Study:
- To synthesize oxygen-incorporated MoS2 nanosheets with expanded interlayers.
- To evaluate the synthesized material's performance in hydrogen evolution reactions and pseudocapacitors.
Main Methods:
- Solvothermal reaction was employed to synthesize oxygen-incorporated MoS2 nanosheets.
- Reaction time was controlled to achieve expanded interlayers (up to ~8.40 Å for (002) faces).
- Electrochemical characterization was performed to assess hydrogen evolution reaction activity and pseudocapacitor performance.
Main Results:
- Oxygen-incorporated MoS2 nanosheets with rich defects exhibited excellent hydrogen evolution reaction activity (Tafel slope of 42 mV decade⁻¹).
- The material demonstrated excellent long-term stability for hydrogen evolution.
- High specific capacitance and excellent long-term cycling stability (up to 20,000 cycles) were observed for pseudocapacitors.
Conclusions:
- Structural modification, specifically oxygen incorporation and interlayer expansion in MoS2, significantly enhances electrochemical performance.
- The developed material shows promise for both hydrogen evolution and energy storage applications.
- The strategy of structural modification is applicable to other TMDs for performance optimization.
