Anderson-typed POM-derived FeS2/MoS2 heterostructure hybridized with graphene for sodium-ion batteries anodes†
*a
and
Jingquan
Sha
ac
Abstract
MoS2, as an anode for sodium-ion batteries (SIBs), has a high theoretical specific capacity yet suffers from sluggish electrochemical kinetics and limited cycling stability. Herein, by employing a pre-organized Fe–O–Mo bridge with precise atomic stoichiometry and coordination structural stability provided by an Anderson-type polyoxometalates FeMo6 ((NH4)3[H6FeMo6O24]), abundant heterogeneous interfaces with strong electric fields were successfully induced to enhance the ion/electronic conductivity and structural stability of FeS2/MoS2. Moreover, the rapid volume expansion resulting from excessively fast ion/electron transport due to the built-in electric fields of FeS2/MoS2 was mitigated by integrating with graphene, further enhancing the structural stability. Benefiting from the synergy between heterostructure engineering and graphene integration, the FeS2/MoS2/rGO-0.5 anode demonstrates exceptional rate capability (334 mAh g−1 at 10 A g−1) and long-term cycling durability (318 mAh g−1 after 500 cycles at 5 A g−1). Ex situ XRD and ex situ XPS analyses reveal that the synergistic intercalation–conversion storage mechanism underpins its ultrahigh-specific capacity. Furthermore, reaction kinetic studies of FeS2/MoS2/rGO-0.5 highlight the critical role of high pseudocapacitive contributions in enabling superior high-rate charge and discharge performance. This dual-strategy approach combining heterostructure engineering with graphene hybridization presents a promising route for developing advanced MoS2-based anode materials.
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