Metal sulfides with high specific capacities have drawn considerable attention in the field of sodium-ion batteries (SIBs). As a typical metal sulfide, FeV₂S₄ always suffers rapid decay of capacities because of its low stability arising from large volume change. FeV₂S₄ nanoparticles with controllable sizes and distribution are encapsulated in carbon nanofibers (CNFs) with the help of graphene oxide (GO) to fabricate FeV₂S₄@GO@CNF. As a result, FeV₂S₄@GO@CNF anodes show enhanced electrochemical performances for Na⁺ storage when compared with FeV₂S₄@CNF with more particles on the surface. Typically, the capacity of FeV₂S₄@GO@CNF can be maintained at 411 mA h g⁻¹ after 200 cycles (0.1 A g⁻¹) and 227 mA h g⁻¹ over 500 cycles (1 A g⁻¹) in SIBs. Moreover, they can deliver a capacity of 170.2 mA h g⁻¹ after 150 cycles (0.1 A g⁻¹) at 0°C. In addition, full cells based on FeV₂S₄@ GO@CNF anodes and Na₃V₂(PO₄)₃/C cathodes achieve a remarkable capacity of 164 mA h g⁻¹ after 100 cycles at 0.5 A g⁻¹. The high specific capacities and stability of FeV₂S₄@GO@CNF can be attributed to GO, which controls the size of FeV₂S₄ nanoparticles and their distribution in CNFs, resulting in the enhanced stability of FeV₂S₄@GO@CNF. This study may provide a new strategy for the synthesis of nanoparticle-CNF composites in catalysts and batteries.

具有高比容量的金属硫化物已在钠离子电池（SIB）领域引起了相当大的关注。作为典型的金属硫化物，FeV ₂ S ₄总是因容量变化大而稳定性差，因此容量急剧下降。FeV ₂ S ₄纳米粒子的尺寸和分布可控，借助氧化石墨烯（GO）将其封装在碳纳米纤维（CNF）中，以制备FeV ₂ S ₄ @ GO @ CNF。结果，与FeV ₂ S ₄相比，FeV ₂ S ₄ @ GO @ CNF阳极显示出增强的Na ⁺储存电化学性能。@CNF表面上有更多颗粒。通常，在SIB中经过200次循环（0.1 A g ^-1）后，FeV ₂ S ₄ @ GO @ CNF的容量可以维持在411 mA hg ^-1，在500次循环中（1 A g ^-1）可以维持在227 mA hg ^-1。此外，它们在0°C下经过150个循环（0.1 A g ^-1）后可提供170.2 mA hg ^-1的容量。此外，基于FeV ₂ S ₄ @ GO @ CNF阳极和Na ₃ V ₂（PO ₄）₃ / C阴极的满电池在0.5 A g的电流下经过100次循环后可实现164 mA hg ^-1的显着容量^-1。FeV ₂ S ₄ @ GO @ CNF的高比容量和稳定性可归因于GO，它控制了FeV ₂ S ₄纳米颗粒的大小及其在CNF中的分布，从而提高了FeV ₂ S ₄ @ GO @的稳定性。CNF。这项研究可能为在催化剂和电池中合成纳米颗粒-CNF复合材料提供新的策略。