Search

Cobalt sulfide (CoS) is a promising battery-type material for electrochemical energy storage. However, the poor conductivity and slow charge transfer kinetics as well as the deficiency of electrochemically active sites seriously limit their applications. Herein, a class of the P-doping induced hexagonal CoS nanosheets with S defects (P-CoS

Carbon nanotube (CNT) film has attracted tremendous attention in functional material research for its unique structure and excellent properties. However, pristine CNT (PCNT) film is hydrophobic, and mechanical strength and conductivity are poor than reported individual CNT. These challenges impede its wide application. Highly efficient closed-loop recycling of both monomer and CNT film is a major challenge. Herein, hydrophilic CNT film with high mechanical strength and conductivity was prepared under the synergistic effects of in situ nitrogen doping and thiol-ene click reaction. The tensile strength, Young’s modulus, and electrical conductivity both in perpendicular and in longitudinal directions are 1,362, 1,658, 222, and 218% higher than those of PCNT film. Closed-loop recycling of CNT film and monomer with high recyclability (100 and 86.72%) has been achieved in a gentle acid environment. The CNT films are 100% recovered and reused to fabricate thiol-functionalized CNT film without deterioration of performance after three cycles, which provides a novel strategy for the preparation of high-performance CNT film and a pathway for high-efficiency closed-loop recycling of CNT film and monomer.

This work reports an electronic structure tuning strategy to synthesize Fe-Ni3Co2 LDH derived from metal-organic framework (MOF). The structure performs well in both supercapacitor and oxygen evolution reaction.

Hollow CuO/Co3O4 and Fe2O3 nanoframes derived from Co/Fe-based PBAs precursor according to the nanoscale Kirkendall effect have been fabricated. The asymmetric supercapacitor delivers a high electrochemical properties.

Herein, for the first time, a pre-intercalated non-metal ion (NH

The development of high-energy cathode for rechargeable aqueous zinc-ion batteries (ZIBs) is highly attractive. However, the disproportionation effect of Mn2+ seriously affects the capacity retention of ZIBs during cycling. Defect engineering provides efficient methods to enhance conductivity and structural stability of active materials. Here, a novel in situ generated bulk oxygen deficient Mn3O4 nanoframes cathode for rechargeable aqueous ZIBs is reported, with high capacity and good electrochemical stability. The oxygen-deficient Mn3O4 spheres display an excellent gravimetric capacity of 325.4 mAh g−1 and a high energy density of 423 Wh kg−1 at a power density of 2257.2 W kg−1. Ex situ X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) characterization demonstrate the initial Mn3O4 is converted to ramsdellite MnO2 for insertion and extraction of H+ and Zn2+. Theoretical modeling reveal that numerous edge sites and oxygen vacancies act as preferential intercalation sites for the zinc ions, leading to a much greater capacity than that of defect-free Mn3O4. These results highlight the potentials of defect engineering as a strategy of improving the electrochemical performance of Mn3O4 in aqueous rechargeable batteries.