Two-dimensional
(2D) transition-metal dichalcogenide materials
show potential for use in alkali metal ion batteries owing to their
remarkable physical and chemical properties. Nevertheless, the electrochemical
energy storage performance is still impaired by the tendency of aggregation,
volume, and morphological change during the conversion reaction and
poor intrinsic conductivity. Until now, ultrathin molybdenum disulfide
nanosheets with a metallic-phase structure on the inner surface of
mesoporous hollow carbon spheres (M-MoS2@HCS) have rarely
been investigated as an anode for sodium-ion batteries. In this work,
a novel M-MoS2@HCS anode was designed and synthesized by
employing a template-assisted solvothermal reaction. Structural and
chemical analyses indicate that the M-MoS2 nanosheets with
a larger interlayer spacing compared to their semiconductor counterpart
grow on the inner surface of HCS via covalent interactions. When used
as the anode materials for Na+ storage, the M-MoS2@HCS anode presents durable and rapid sodium storage properties.
The developed electrode shows a reversible capacity of 291.2 mAh g–1 at a high current density of 5 A g–1. After 100 cycles at 0.1 A g–1, the reversible
capacity is 401.3 mAh g–1 with a capacity retention
rate of 79%. After 2500 cycles at 1.0 A g–1, the
electrode still delivers a reversible capacity of 320.1 mAh g–1 with a capacity retention rate of 75%. The excellent
sodium storage capability of the MoS2@HCS electrode is
explained by the special structural design, which reveals great potential
to accelerate the practical applications of transition-metal dichalcogenide
electrodes for sodium storage.
A sensitive electrochemical sensor for the simultaneous determination of acetaminophen (ACOP) and tyrosine (Tyr) was proposed based on MWCNTs-doped poly (glycine) (p-gly)/ poly (acrylic acid) (PAA) conducting polymers modified screen-printed electrode (SPE). The incorporation of MWCNTs and pgly/ PAA composite conductive polymers brought about enhanced electro-catalytic activity and additional binding sites for ACOP and Tyr. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) were performed to investigate the electrochemical behaviors of ACOP and Tyr. Under the optimal experimental conditions, the oxidation peak currents of ACOP and Tyr increased linearly with two concentration intervals over the range of 0.25-120 μM and 0.4-150 μM, respectively. The detection limits (S/N = 3) were 0.08 μM for ACOP and 0.13 μM for Tyr. Moreover, the sensor has been successfully applied for the determination of ACOP and Tyr in human serum samples, showing its great application prospects in pharmaceutical analysis.
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