Synthesis of LaW/Ag/GNRs nanocomposite: Application as transducer material for the simultaneous nano molar detection of synthetic dyes and as anode material for Li ion batteries

Abstract

In this present research, we have synthesized the lanthanum tungstate/silver nanoparticle/graphene nanoribbons (LaW/Ag/GNRs) nanocomposite as a novel system for the simultaneous electrochemical determination of two synthetic food colorants sunset yellow (SY) and acid yellow (AY). The synthesised nanocomposite modified graphite electrode (Gr) provides the presence of more active sites for the transfer of electrons, allowing for a stronger voltametric response that is due to the faster rate of electron transfer from the analytes. The as-synthesized nanocomposite was characterized by different analytical methods. The enhanced anodic peak currents represented the excellent analytical performance for simultaneous detection of SY and AY in the range of 20 nm to 450 nM, with a low limit of detection (LOD) of 0.025 nm for SY and 0.050 nM for AY. This proposed sensor showed excellent recovery values real sample analysis. Further the nanocomposite was used as the anode material in Li ion batteries and was evaluated in an aqueous saturated Li2SO4 electrolyte. In terms of cycle performance, enhanced rate capability, and high discharge capacity, LaW/Ag/GNRs nanocomposite has made significant advancements. The lithiated LaW/Ag/GNRs nanocomposite half-cell vs. SCE offers a 227.86 mA h g−1 capacity up to 10 cycles at 0.08 mA. In the potential range of 1.0 to 0.0 V, the whole cell configuration LaW/AgNPs/GNRs|aq.saturated Li2SO4|LiMn2O4 produced a discharge capacity of 240.24 mA h g−1. With 96.95% columbic efficiency, the battery performance of the cell has greatly boosted. This excellent result clearly fits this material as an anode in future aqueous rechargeable lithium batteries for energy technology.