Unveiling the Nanoarchitectonics of Interfacial Electronic Coupling in Atomically Thin 2D WO3/WSe2 Heterostructure for Sodium-Ion Storage in Aqueous System

초록

Aqueous sodium (Na+) ion storage systems face challenges due to sluggish adsorption and diffusion of Na+ ions with larger size, hindering their potential for stationary applications. This issue is addressed by evolving the interfacial electronic coupling in atomically thin 2D WO3/WSe2 heterostructure for efficient Na+ ion storage. Density functional theory (DFT) analysis elucidates the superior charge storage capability for the WO3/WSe2 heterostructure facilitated by the charge transfer from the WO3 - WSe2 (002). The charge transfer from the W-5d and O-2p orbitals of WO3 to the valence W-5d and Se-4p orbitals of the WSe2 (002) surface boosts the electronic conductivity. As a result, the WO3/WSe2 electrode demonstrates exceptional Na+ ion storage, with a specific capacitance of 378.1 F g(-1) at 1 A g(-1), excellent rate capability, and long-lasting cycling durability. The full cell comprising WO3/WSe2 as the negative and MnSe/MnSe2 as the positive electrode achieved a peak energy density of 82.1 Wh kg(-1) at a power density of 1873.5 W kg(-1), along with high rate capability and long-cycle durability. Insights gained from this study pave the technique for the rational design and optimization of the interfacial electronic features in 2D heterostructures for next-generation energy storage devices with enhanced performance and stability.

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