Metal–Organic Framework-Derived Sea-Cucumber-like FeS₂@C Nanorods with Outstanding Pseudocapacitive Na-Ion Storage Properties

Abstract

Sodium-ion batteries (SIBs) are supposed to be attractive energy strorage and supply devices due to the abundant reserves of sodium. Their limited specific capacity and rate capacity, however, are standing in the way of the extensive application of SIBs. It is reported herein that porous sea-cucumber-like FeS 2 @C nanorods can act as efficient cathode materials to satisfy the rigorous requirements of the proposed applications. The fabrication of the sea-cucumber-like FeS 2 @C nanorods involves the hydrothermal growth of F-MIL (where F = Fe, MIL = materials from the Lavoisier Institute) nanorods, and subsequent sulfidation. The electrochemical results demonstrate that the FeS 2 @C nanorods are an outstanding cathode material for SIBs with high specific capacity (385 mAh/g), ultralong lifetime (160 mAh/g after 10 000 cycles at 20 A/g), and exceptional rate capability. The metal−organic framework (MOF) template method provides a useful route toward the development of high-performance electrode materials with robust power and cyclability.

Nitrogen-Doped Porous Carbon Framework Supports Ultrafine FeS2 Nanoparticles as Advanced Performance Anode Materials for Sodium-Ion Batteries

“…Figure b shows the Fe 2p XPS spectrum of FeS 2 /NPCF. It can be seen that through fitting, two signal peaks were located at 719.5 and 707.9 eV, which were related to Fe 2p 1/2 and Fe 2p 3/2 , while the peaks at 711.0 and 724.7 eV correspond to the Fe–O bond. It is related to the slight oxidation of FeS 2 .…”

Nanosheets Derived through Dissolution‐Recrystallization of TiB2 as Efficient Anode for Sodium‐Ion Batteries

“…[10] MoS 2 , VS 2 , TiS 2 and NiS 2, SnS and FeS 2 have been widely studied as 2D anode material. [11][12][13][14] Mortazavi et al [15] reported that the layered MoS 2 could be used as the anode material for SIBs, which has a maximum theoretical capacity of 146 mAh g À 1 . DFT calculations prove that the NiS 2 surface has a high chemical affinity towards Na ions, promising the concentration of Na ion on the surface for fast redox reactions during sodiation/de-sodiation of NiS 2 .…”

One-dimensional core–shell motif nanowires with chemically-bonded transition metal sulfide-carbon heterostructures for efficient sodium-ion storage

“…In addition, the obtained materials usually exhibit a carbon coating with uneven thickness and weak bonding between the TMS and the carbon layer, which is unfavorable for charge-transfer applications and cannot totally guarantee the prevention of volume changes during the charge/discharge process. [20][21][22] Recently, it was reported that a simple one-step synthesis of Ni 3 S 2 nanowires through low-temperature pyrolysis of sulfonic acid group-containing resin with Ni foam. 23 Although some carbon species were also generated with the Ni 3 S 2 nanowires, the obtained carbon could not be uniformly covered on the surface of nanowires.…”