Abstract
Herein,we focused on the development of the V4C3 MXene composite bimetallic selenide heterostruc-ture(V4C3@CuSe2/CoSe2)as a cathode material for aluminum batteries.This heterostructure was pre-pared through a Lewis melt salt etching and selenization process.By capitalizing on the synergistic effect between the bimetallic selenide and V4C3 MXene,V4C3@CuSe2/CoSe2 exhibited rapid charge transfer and demonstrated superior discharge specific capacity compared to V4C3 composite monometallic selenide.Furthermore,the incorporation of V4C3 improved the material's stability during charging/discharging.The initial discharge specific capacity of V4C3@CuSe2/CoSe2 reached an impressive 809 mAh g-1 at 1 Ag-1.Even after nearly 3000 cycles,it retained a substantial capacity of 169.1 mAh g-1.Ex-situ XPS analysis confirmed the reversible valence transitions of Cu,Co,and Se elements as the main energy storage reac-tions taking place in the cathode material.Density functional theory analysis provided further insights,revealing that the strong metallic behavior of the heterostructure stemmed from the charge rearrange-ment facilitated by the bimetallic selenide structure and the optimization of the energy level structure.Additionally,the presence of the bimetallic selenide structure significantly improved the adsorption ef-ficiency of[AlCl4]-.Overall,this research contributes to the advancement of rechargeable aluminum ion batteries and presents a promising avenue for future developments in composite metal selenide struc-tures and MXene-based materials.
基金项目
National Natural Science Foundation of China(52102233)
Science and Technology Project of Hebei Education Department(QN2023019)
NETL
NSTL
万方数据