Constructing cation-coupled MoSe2/FeSe/C heterostructures for rapid and efficient sodium ion transport
Document Type
Article
Publication Date
1-1-2024
Abstract
Low electron conductivity and slow ion dynamics are the two key barriers limiting the use of transition-metal selenide (TMSe) anodes for high-power energy storage device applications. A rational structural design for TMSe can effectively promote the rapid transfer of Na+ on the surface and bulk phase. Presently, a cation-coupled MoSe2/FeSe/C heterostructure is developed by a facile two-step reaction and applied to sodium ion batteries/capacitors (SIBs/SICs). Wherein, a unique edge mixed phase (1T/2H-MoSe2) is generated under Fe induction. Additionally, the metal-organic framework-derived carbon guarantees structural stability and provides support for the rapid adsorption and transport of Na+ on the surface and bulk. Significantly, density functional theory (DFT) calculations verify that the constructed MoSe2/FeSe heterogeneous interface has a strong metallic property that can facilitate the rapid transfer of electrons and ions within the bulk phase. As a result, the prepared MoSe2/FeSe/C can deliver a high specific capacity of 597.2 mA h g-1 (after 1000 cycles) at a current density of 2 A g-1 when applied as the anode of SIBs. Impressively, 3000 cycles can be stabilized, even at a high current density of 10 A g-1. When applied to SIC anodes, a capacity retention of 80.4 can be achieved at 2 A g-1 after 8000 cycles. The strategy of combining cation-coupled induced phase transitions with heterostructure design can serve as a reference for exploring the potential of TMSe in high-power energy storage devices. © 2023 American Chemical Society
Divisions
PHYSICS
Funders
National Natural Science Foundation of China [Grant no. 22008053, 52002111],Ministry of Higher Education, Malaysia [Grant no. FRGS/1/2022/STG05/UM/02/3],Natural Science Foundation of Hebei Province [Grant no. B2021208061, B2022208006],Universiti Malaya [Grant no. ST089-2022]
Publication Title
ACS Materials Letters
Volume
6
Issue
1
Publisher
American Chemical Society
Additional Information
Low electron conductivity; Slow ion dynamics; Transition-metal selenide; Cation-coupled MoSe2/FeSe/C heterostructure; Sodium ion batteries/capacitors