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The conversion mechanism of 2D FePS 3 material offers superior electrochemical performance. The introduction of the N-doped carbon layer can facilitate the buffering of volume expansion and serve as efficient Na+/electron transfer pathways to promote the charging-discharging process of inner FePS 3 nanosheets. [Display omitted] • FePS 3 /NC is designed as a potential anode material for sodium-ion batteries. • 2D structure of layered MPS 3 provides enough active sites. • N-doped carbon ensures fast charge transfer and structural stabilization. • The reaction mechanism is investigated by ex-situ XRD and DFT calculations. The development of anode materials with high-rate capability and long cyclability has become a research hotspot for sodium-ion batteries (SIBs). In this work, we propose a simple and convenient method for the synthesis of few-layered FePS 3 nanosheets modified by N-doped carbon (FePS 3 @NC) through a controllable coating of polydopamine on the surface of exfoliated FePS 3 nanosheets followed by subsequent carbonization. The optimized FePS 3 @NC anode exhibits a superior capacity performance for 800 cycles with a high specific capacity of 281 mAh g−1 at 1.0 A g−1 due to high ionic conductivity of metal phosphorus trichalcogenides (MPS 3) and the unique two-dimensional (2D) few-layered structure of ultrathin nanosheets. Besides, the N-doped carbon layer (NC) decreases Na+ diffusion resistance and buffers the volumetric change during cycles, which are validated by the ex-situ X-ray diffraction and density functional theory (DFT) calculations. Furthermore, the full cell coupled by FePS 3 @NC anode and Na 3 V 2 (PO 4) 3 /carbon (NVP/C) cathode also displays high cycling stability. This work gives insight into the development of superior properties anodes for SIBs based on two-dimensional (2D) van der Waals crystals. [ABSTRACT FROM AUTHOR]

The as-prepared binder-free Co 1−x S/MCF anode exhibits the desirable electrochemical performance for LIBs and SIBs, which can be attributed to the unique hierarchical nanostructure which provides enough active sites and internal space for volume expansion. [Display omitted] • The flexible Co 1−x S/MCF electrode is prepared via the electrospinning technique. • The Co 1−x S/MCF presents hierarchically hollow and multichannel structures. • The Co 1−x S/MCF electrode can effectively ease the huge volume expansion. • The Co 1−x S/MCF electrode shows high electrochemical performance for LIBs and SIBs. The exploration of prospective electrode materials represents great challenges for remarkable lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). Herein, we report a reliable synthetic approach for the in-situ growth of the Co-based zeolitic imidazolate framework (ZIF-67) on electrospun nanofibers, followed by carbonization and sulfurization with the formation of free-standing Co 1−x S hollow polyhedrons anchored on multichannel carbon nanofibers (Co 1−x S/MCF) for LIBs and SIBs. The Co 1−x S/MCF electrode displays a high reversible capacity (813 mAh g−1 over 180 cycles at 0.1 A g−1), and stable cycle performance (559 mAh g−1 for 300 cycles at 1 A g−1) in LIBs. For SIBs, Co 1−x S/MCF electrode exhibits a favorable Na-storage capacity (433 mAh g−1 over 120 cycles at 0.1 A g−1). The as-prepared binder-free Co 1−x S/MCF anode demonstrates the advanced electrochemical properties for LIBs and SIBs. It is attributed to the particular multichannel nanostructure and the Co 1−x S hollow polyhedrons (Co 1−x S HPs), which provide enough active sites, and the internal void space effectively reduces the structural strain and eases the volume expansion to maintain structural integrity. This work gives insights to design a unique structure for promising LIBs and SIBs. [ABSTRACT FROM AUTHOR]

The as-prepared binder-free Co 1−x S/MCF anode exhibits the desirable electrochemical performance for LIBs and SIBs, which can be attributed to the unique hierarchical nanostructure which provides enough active sites and internal space for volume expansion. [Display omitted] • The flexible Co 1−x S/MCF electrode is prepared via the electrospinning technique. • The Co 1−x S/MCF presents hierarchically hollow and multichannel structures. • The Co 1−x S/MCF electrode can effectively ease the huge volume expansion. • The Co 1−x S/MCF electrode shows high electrochemical performance for LIBs and SIBs. The exploration of prospective electrode materials represents great challenges for remarkable lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). Herein, we report a reliable synthetic approach for the in-situ growth of the Co-based zeolitic imidazolate framework (ZIF-67) on electrospun nanofibers, followed by carbonization and sulfurization with the formation of free-standing Co 1−x S hollow polyhedrons anchored on multichannel carbon nanofibers (Co 1−x S/MCF) for LIBs and SIBs. The Co 1−x S/MCF electrode displays a high reversible capacity (813 mAh g−1 over 180 cycles at 0.1 A g−1), and stable cycle performance (559 mAh g−1 for 300 cycles at 1 A g−1) in LIBs. For SIBs, Co 1−x S/MCF electrode exhibits a favorable Na-storage capacity (433 mAh g−1 over 120 cycles at 0.1 A g−1). The as-prepared binder-free Co 1−x S/MCF anode demonstrates the advanced electrochemical properties for LIBs and SIBs. It is attributed to the particular multichannel nanostructure and the Co 1−x S hollow polyhedrons (Co 1−x S HPs), which provide enough active sites, and the internal void space effectively reduces the structural strain and eases the volume expansion to maintain structural integrity. This work gives insights to design a unique structure for promising LIBs and SIBs. [ABSTRACT FROM AUTHOR]