Carbon-Coated ZnS-FeS2 Heterostructure as an Anode Material for Lithium-Ion Battery Applications.

The construction of carbon-coated heterostructures of bimetallic sulfide is an effective technique to improve the electrochemical activity of anode materials in lithium-ion batteries. In this work, the carbon-coated heterostructured ZnS-FeS2 is prepared by a two-step hydrothermal method. The crystallinity and nature of carbon-coating are confirmed by the investigation of XRD and Raman spectroscopy techniques. The nanoparticle morphology of ZnS and plate-like morphology of FeS2 is established by TEM images. The chemical composition of heterostructure ZnS-FeS2@C is discovered by an XPS study. The CV results have disclosed the charge storage mechanism, which depends on the capacitive and diffusion process. The BET surface area (37.95 m2g-1) and lower Rct value (137 Ω) of ZnS-FeS2@C are beneficial to attain higher lithium-ion storage performance. It delivered a discharge capacity of 821 mAh g-1 in the 500th continuous cycle @ A g-1, with a coulombic efficiency of around 100%, which is higher than the ZnS-FeS2 heterostructure (512 mAh g-1). The proposed strategy can improve the electrochemical performance and stability of lithium-ion batteries, and can be helpful in finding highly effective anode materials for energy storage devices.

A highly selective dual mode detection of Fe3+ ion sensing based on 1,5-dihydroxyanthraquinone in the presence of ß-cyclodextrin.

1,5-Dihydroxyanthraquinone (1,5-DHAQ) and in the presence of ß-cyclodextrin (ß-CD) has been used to find Fe(3+) ion in aqueous solution by UV-visible and fluorescence spectroscopy. The chromo-fluorogenic probe undergoes absorption and emission intensity enhancement upon binding to Fe(3+) ion in pH~7 aqueous solutions. The enhancement of the chemosensor probe is attributed to a 1:1 inclusion complex formation between ß-CD and 1,5-DHAQ, which has been utilized as the basis for selective detection of Fe(3+) ion. The chemosensors can be applied to the selectivity and sensitivity analysis which showed that the remarkable sensing limit of detection (LOD) was 7.3∗10(-7)M (ß-CD/1,5-DHAQ:Fe(3+)). The proposed chemosensors based on 1,5-DHAQ and in the presence of ß-CD has a good selectivity, sensitivity and potential application to the determination of Fe(3+) ion in environmental and biological systems.

N-phenyl-1-naphthylamine/ß-cyclodextrin inclusion complex as a new fluorescent probe for rapid and visual detection of Pd(2+).

Inclusion complex between N-phenyl-1-naphthylamine (NPN) and ß-cyclodextrin (ß-CD) was studied by FT-IR, (1)H and 2D NMR, XRD, FT-Raman, SEM and DSC techniques. The formation of 1:1 stoichiometric inclusion complex of NPN with ß-CD was proposed based on the Nuclear magnetic resonance spectroscopy and Molecular docking study. The molecular encapsulation of host-guest inclusion complex based on simple chemosensor has high selectivity and sensitivity for the determination of Pd(2+) ion. Host-guest inclusion complex as a spectroscopic probe is used for the detection of transition metal cation Pd(2+). Coordination of this Pd(2+) with (NPN/ß-CD) inclusion complex exhibited a noticeable color change in the solution state it used for naked-eye detection.