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MoSe2 Nanosheet Array with Layered MoS2 Heterostructures for Superior Hydrogen Evolution and Lithium Storage
Jing Yang1, Jixin Zhu2, Jingsan Xu3
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University , Shanghai 201620, P. R. China.
ACS Applied Materials & Interfaces
|December 2, 2017
Summary
Researchers developed a low-cost, solution-processed method to create molybdenum disulfide (MoS2) and molybdenum diselenide (MoSe2) heterostructures. These novel materials show promise as efficient electrodes for both energy conversion and storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Engineering transition metal disulfide heterostructures using cost-effective and high-yield methods remains a significant challenge.
- Conventional deposition techniques often lack scalability and efficiency for creating complex heterostructures.
Purpose of the Study:
- To develop a low-energy-consumption, solution-processed strategy for preparing molybdenum disulfide-molybdenum diselenide (MoS2-MoSe2) heterostructures.
- To investigate the potential of these heterostructures as bifunctional electrodes for energy conversion and storage.
Main Methods:
- A solution-processed strategy was employed to synthesize MoSe2 nanosheet arrays on layered MoS2.
- Characterization of the unique compositional and structural features of the MoS2-MoSe2 heterostructures.
Main Results:
- Uniform coverage of MoS2 with high-density, vertically aligned MoSe2 arrays was achieved.
- The heterostructures exhibited enhanced active sites and facilitated ion transfer due to their porous structure.
- Demonstrated active and acid-stable hydrogen evolution reaction catalysis.
- Achieved a high specific capacity of 728 F g-1 at 0.1 A g-1 and excellent durability (676 mA h g-1 after 200 cycles).
Conclusions:
- The developed MoS2-MoSe2 heterostructures offer a promising, low-cost approach for advanced electrode materials.
- These materials show significant potential as bifunctional electrodes for efficient energy conversion and storage.
