In Situ Hybridization Strategy Constructs Heterogeneous Interfaces to Form Electronically Modulated MoS₂/FeS₂ as the...

The interfacial effect is important for anodes of transition metal dichalcogenides (TMDs) to achieve superior lithium-ion storage performance. In this paper, a MoS₂/FeS₂ heterojunction is synthesized by a simple hydrothermal reaction to construct the interface effect, and the heterostructure introduces an inherent electric field that accelerates the de-embedding process of lithium ions, improves the electron transfer capability, and effectively mitigates volume expansion. XPS analysis confirms evident chemical interaction between MoS₂ and FeS₂ via an interfacial covalent bond (Mo-S-Fe). This MoS₂/FeS₂ anode shows a distinct interfacial effect for efficient interatomic electron migration. The electrochemical performance demonstrated that the discharge capacity can reach up to 1217.8 mA h g^-1 at 0.1 A g^-1 after 200 cycles, with a capacity retention rate of 72.9%. After 2000 cycles, the capacity retention is about 61.6% at 1.0 A g^-1, and the discharge capacity can still reach 638.9 mA h g^-1. Electrochemical kinetic analysis indicated an enhanced pseudocapacitance contribution and that the MoS₂/FeS₂ had sufficient adsorption of lithium ions. This paper therefore argues that this interfacial engineering is an effective solution for designing sulfide-based anodes with good electrochemical properties.