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Tunable Surface Selenization on MoO2 -Based Carbon Substrate for Notably Enhanced Sodium-Ion Storage Properties
Fanyan Zeng1, Maohui Yu1, Wanting Cheng1
1Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang, 330022, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|September 21, 2020
Summary
This study developed a novel surface selenization strategy for molybdenum disulfide (MoSe2) on a carbon substrate, significantly enhancing sodium-ion battery anode stability and performance. The new material demonstrates excellent cycling stability and rate capability for advanced energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Transition metal chalcogenides are promising anode materials for sodium-ion batteries (SIBs) due to their high theoretical capacity.
- However, their practical application is hindered by poor cycling stability caused by structural collapse and agglomeration.
Purpose of the Study:
- To design a tunable surface selenization strategy for MoO2-based carbon substrates.
- To create robust hierarchical MoO2@MoSe2 heterostructures for improved sodium-ion storage.
Main Methods:
- Synthesized a novel material (b-NC/g-MoO2@s-MoSe2-10) via surface selenization.
- Characterized the material's structure and electrochemical performance.
- Utilized ex situ analyses, kinetic studies, and density functional theory (DFT) calculations.
Main Results:
- The b-NC/g-MoO2@s-MoSe2-10 material exhibited strong chemical couplings and reinforced structural integrity.
- Achieved excellent rate capability and ultralong cycling stability with 254.2 mAh g-1 at 5.0 A g-1 after 6000 cycles (89.0% retention).
- Demonstrated significantly improved reaction kinetics for fast and stable sodium-ion storage.
Conclusions:
- The tunable surface selenization strategy effectively creates hierarchical heterostructures for high-performance SIB anodes.
- This approach offers new insights for designing advanced transition metal chalcogenide-based materials for energy storage applications.
