▎ 摘　　要

Smart construction of ultraflexible electrodes with superior gravimetric and volumetric capacities is still challenging yet significant for sodium ion batteries (SIBS) toward wearable electronic devices. Herein, a hybrid film made of hierarchical Fe1-xS-filled porous carbon nanowires/reduced graphene oxide (Fe1-xS@PCNWs/rGO) is synthesized through a facile assembly and sulfuration strategy. The resultant hybrid paper exhibits high flexibility and structural stability. The multidimensional paper architecture possesses several advantages, including rendering an efficient electron/ion transport network, buffering the volume expansion of Fe1-xS nanoparticles, mitigating the dissolution of polysulfides, and enabling superior kinetics toward efficient sodium storage. When evaluated as a self-supporting anode for SIBs, the Fe1-xS@PCNWs/rGO paper electrode exhibits remarkable reversible capacities of 573-89 mAh g(-1) over 100 consecutive cycles at 0.1 A g(-1) with areal mass loadings of 0.9-11.2 mg cm(-2) and high volumetric capacities of 424-180 mAh cm(-3) in the current density range of 0.2-5 A g(-1). More competitively, a SIB based on this flexible Fe1-xS@PCNWs/rGO anode demonstrates outstanding electrochemical properties, thus highlighting its enormous potential in versatile flexible and wearable applications.