Heterostructure engineering combined with carbonaceous materials shows great promise toward promoting sluggish kinetics, improving electronic conductivity, and mitigating the huge expansion of transition metal sulfide electrodes for high-performance sodium storage. Herein, the iron sulfide-based heterostructures in situ hybridized with nitrogen-doped carbon nanotubes (Fe₇S₈/FeS₂/NCNT) have been prepared through a successive pyrolysis and sulfidation approach. The Fe₇S₈/FeS₂/NCNT heterostructure delivered a high reversible capacity of 403.2 mAh g⁻¹ up to 100 cycles at 1.0 A g⁻¹ and superior rate capability (273.4 mAh g⁻¹ at 20.0 A g⁻¹) in ester-based electrolyte. Meanwhile, the electrodes also demonstrated long-term cycling stability (466.7 mAh g⁻¹ after 1,000 cycles at 5.0 A g⁻¹) and outstanding rate capability (536.5 mAh g⁻¹ at 20.0 A g⁻¹) in ether-based electrolyte. This outstanding performance could be mainly attributed to the fast sodium-ion diffusion kinetics, high capacitive contribution, and convenient interfacial dynamics in ether-based electrolyte.

与碳质材料相结合的异质结构工程在促进缓慢动力学、提高电子电导率和缓解高性能钠存储的过渡金属硫化物电极的巨大膨胀方面显示出巨大的前景。在此，通过连续的热解和硫化方法制备了与氮掺杂碳纳米管原位杂化的硫化铁基异质结构(Fe ₇ S ₈ /FeS _{2 /NCNT)。}Fe ₇ S ₈ /FeS ₂ /NCNT异质结构在1.0 A g ^{-1下提供高达100次循环的403.2 mAh g -1}的高可逆容量和优异的倍率性能（在20.0 A g ^{-1下为273.4 mAh g -1}）。酯基电解质。同时，该电极在醚基电解液中还表现出长期循环稳定性（在5.0 A g ^{-1下循环1000次后为466.7 mAh g -1}）和出色的倍率性能（在20.0 A g ^{-1下为536.5 mAh g -1}）。这种出色的性能主要归功于醚基电解质中快速的钠离子扩散动力学、高电容贡献和方便的界面动力学。