The nanostructured metal sulfides have been reported as promising anode materials for sodium-ion batteries (SIBs) due to their high theoretical capacities but have suffered from the unsatisfactory electronic conductivity and poor structural stability during a charge/discharge process, thus limiting their applications. Herein, the one-dimensional (1D) porous FeS/carbon fibers (FeS/CFs) micro/nanostructures are fabricated through facile pyrolysis of double-helix-structured Fe-carrageenan fibers. The FeS nanoparticles are in situ formed by interacting with sulfur-containing group of natural material ι-carrageenan and uniformly embedded in the unique 1D porous carbon fibrous matrix, significantly enhancing the sodium-ion storage performance. The obtained FeS/CFs with optimized sodium storage performance benefits from the appropriate carbon content (20.9 wt %). The composite exhibits high capacity and excellent cycling stability (283 mAh g at current density of 1 A g after 400 cycles) and rate performance (247 mAh g at 5 A g). This work provides a simple strategy to construct 1D porous FeS/CFs micro/nanostructures as high-performance anode materials for SIBs via a unique sustainable and environmentally friendly way.
Chemically durable and effective absorbent materials for selenite (SeO ) remain highly desirable for contamination remediation. Now a bismuth-based metal-organic framework (Bi-MOF, CAU-17) was used as adsorbent to capture SeO anions from aqueous solution with ultrahigh adsorption capacity of 255.3 mg g and fast kinetics. Furthermore, the adsorbent showed excellent selectivity for SeO and was able to work steadily in a broad pH range of 4-11. Density functional theory (DFT) calculation, XANES modeling, and EXAFS fitting suggested that SeO anions were immobilized by forming Bi-O-Se bonds (T-3 structural model) though splitting the O-Bi-O bond in the crystal structure, leading to a structural transformation of CAU-17 in the solid state.
The rational design and optimization of solid polymer electrolytes (SPEs) are critical for the application of safety and high efficiency lithium ion batteries (LIBs). Herein, we synthesized a novel poly(ethylene oxide) (PEO)-based SPE (PEO@AF SPE) with a crosslinking network by the introduction of alginate fiber (AF) membranes. Depending on the high-strength supporting AF skeleton and the crosslinking network formed by hydrogen bonds between the PEO matrix and AF skeleton, the obtained PEO@AF SPE exhibits an excellent tensile strength of 3.71 MPa, favorable heat resistance (close to 120 °C), and wide electrochemical stability window (5.2 V vs Li/Li + ). Meanwhile, the abundant oxygen-containing groups in alginate macromolecular and the three-dimensional (3D) porous structure of the AF membrane can greatly increase Li + anchor points and provide more Li + migration pathways, leading to the enhancement of Li + conduction and interfacial stability between the SPE and Li anode. Furthermore, the assembled LiFePO 4 /PEO@AF SPE/Li cells also exhibit satisfactory electrochemical performance. These results reveal that PEO incorporating with AFs can boost the mechanical strength, thermostability, and electrochemical properties of the SPE simultaneously. Furthermore, one will expect that the newly designed PEO@AF SPE with cross-linked networks thus provides the possibility for future applications of safety and high-performance LIBs.
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