March 3, 2026

MOF‐74‐Derived Fe 7 S 8 @C Composites as High‐Performance Anodes for Sodium‐Ion Batteries

Puntos clave

Fe7S8@C composites achieve a reversible specific capacity of 333 mAh g−1 at 5 A g−1 over 2000 cycles, confirming superior electrochemical properties.
The dual morphology of the composites facilitates fast charge transfer kinetics, leading to extraordinary cyclical stability and rate performance.
Synthesis employs Zn/Fe-MOF-74 as a sacrificial template followed by sulfurization to create unique architecture and effective nanocrystal distribution.
Extending this synthetic strategy to metal sulfide@carbon composites may enhance the development of advanced sodium-ion battery anodes.

Resumen

ABSTRACT Fe 7 S 8 @C composites have been synthesized by employing Zn/Fe‐MOF‐74 as a sacrificial template and followed by sulfurization treatment. Fe 7 S 8 @C composites exhibit a dual morphology, comprising spindle‐like frameworks with secondary submicron particles dispersed throughout. When applied as a sodium‐ion battery (SIB) anode, the Fe 7 S 8 @C composites exhibit superior electrochemical properties with superior rate performance and extraordinary cyclical stability, achieving a reversible specific capacity of 333 mAh g −1 at 5 A g −1 upon 2000 cycles. The excellent electrochemical performance of the Fe 7 S 8 @C composite arises from the synergistic effects of its distinctive architecture, in which Fe 7 S 8 is responsible for providing a high capacity, and homogeneously distributed Fe 7 S 8 nanocrystals confined within the porous carbon framework collectively suppress particle agglomeration, promote fast charge transfer kinetics, and guarantee optimal electrolyte accessibility. It is encouraging that our synthetic strategy can be extended to prepare various metal sulfide@carbon composites as superior anode materials for SIBs.

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