Facilitating Rapid Na+ Storage through MoWSe/C Heterostructure Construction and Synergistic Electrolyte Matching Strategy
Document Type
Article
Publication Date
3-1-2024
Abstract
The realization of sodium-ion devices with high-power density and long-cycle capability is challenging due to the difficulties of carrier diffusion and electrode fragmentation in transition metal selenide anodes. Herein, a Mo/W-based metal-organic framework is constructed by a one-step method through rational selection, after which MoWSe/C heterostructures with large angles are synthesized by a facile selenization/carbonization strategy. Through physical characterization and theoretical calculations, the synthesized MoWSe/C electrode delivers obvious structural advantages and excellent electrochemical performance in an ethylene glycol dimethyl ether electrolyte. Furthermore, the electrochemical vehicle mechanism of ions in the electrolyte is systematically revealed through comparative analyses. Resultantly, ether-based electrolytes advantageously construct stable solid electrolyte interfaces and avoid electrolyte decomposition. Based on the above benefits, the Na half-cell assembled with MoWSe/C electrodes demonstrated excellent rate capability and a high specific capacity of 347.3 mA h g(-1) even after cycling 2000 cycles at 10 A g(-1). Meanwhile, the constructed sodium-ion capacitor maintains similar to 80% capacity retention after 11,000 ultralong cycles at a high-power density of 3800 W kg(-1). The findings can broaden the mechanistic understanding of conversion anodes in different electrolytes and provide a reference for the structural design of anodes with high capacity, fast kinetics, and long-cycle stability.
Keywords
MoWSe/C electrode, heterostructures, electrolytes, structure design, sodium-ion devices
Divisions
PHYSICS
Funders
National Natural Science Foundation of China (NSFC) (FRGS/1/2022/STG05/UM/02/3),Ministry of Education, Malaysia (22008053); (52002111),National Natural Science Foundation of China (NSFC) (B2021208061); (B2022208006),Natural Science Foundation of Hebei Province (JZX2024025),Science Foundation of University of Hebei Province (ST089-2022),Universiti Malaya
Publication Title
ACS Nano
Volume
18
Issue
14
Publisher
American Chemical Society
Publisher Location
1155 16TH ST, NW, WASHINGTON, DC 20036 USA