PMo11V@N-CNT electrochemical properties and its application as electrochemical sensor for determination of acetaminophen

Abstract

A polyoxometalate-nanocarbon composite, PMo 11 V@N-CNT, was prepared by a simple procedure which consisted of the immobilization of phosphovanadomolybdate (PMo 11 V) onto N-doped carbon nanotubes (N-CNT). The FTIR and XPS characterizations confirmed its successful synthesis. The cyclic voltammograms of glassy carbon electrode (GCE) modified with PMo 11 Vand PMo 11 V@N-CNT showed four Mo-centred redox processes (Mo VI/V) and a vanadium redox process (V V/IV). All were surface-confined redox processes. Additionally, PMo 11 V@N-CNT/GCE showed good stability and well-resolved redox peaks with high current intensities. The electrocatalytic sensing properties of PMo 11 V@N-CNT/GCE towards acetaminophen (AC) in the presence of tryptophan (TRP) were evaluated by square wave voltammetry. Under the conditions used, the peak current increased linearly with AC concentration in the presence of TRP, with a linear range from 1.5 × 10 −6 to 3.9 × 10 −4 mol dm −3 and a detection limit of 1.0 × 10 −6 mol dm −3 .

Simple and efficient polyoxomolybdate-mediated synthesis of novel graphene and metal nanohybrids for versatile applications

“…The mean peak potentials E1/2=(Epa+Epc)/2 for MoS/rGO/GC appeared at about +0.306V (I−I′), +0.198 V (II−II′) and -0.022V (III−III′) vs. SCE with peak potential separations of 10, 14 and 21 mV (at scan rate: 100 mV•s −1 ), respectively. These data are consistent with those reported in the literature andare attributed to Mo VI →Mo V redox processes[37][38][39][40].…”

Polyoxotungstate@Carbon Nanocomposites As Oxygen Reduction Reaction (ORR) Electrocatalysts

“…As observed by the SEM images, the nanocomposites with POM immobilized at the N-doped CM presented higher agglomeration of POM clusters which may be responsible for their better performances. Several works have reported that N-doping of carbon materials improves not only the immobilization of different species , but also the electrocatalytic activity toward ORR. , So, the Co 4 (PW 9 ) 2 @N-CNT and Co 4 (PW 9 ) 2 @N-FLG better performances (higher current densities) are a consequence of N-doping of CMs but also of a better synergy between these CMs and the polyoxometalates. Considering these two nanocomposites, the better performance of the former also may be a consequence of the higher amount of N content determined by the XPS analysis.…”

Electrochemical investigation and amperometry determination iodate based on ionic liquid/polyoxotungstate/P-doped electrochemically reduced graphene oxide multi-component nanocomposite modified glassy carbon electrode

“…37 Furthermore, immobilization or dispersion of POMs on different supporting carbon materials has attracted signicant attention due to their small background currents, wide potential windows, low-cost, excellent chemical stability, and a strong affinity for POMs. [38][39][40][41][42][43] Graphene was discovered in 2004 as a new carbon nanostructure by Novoselov and Geim. 44 Graphene is a twodimensional (2D) crystal composed of a monolayer of sp 2 hybridized carbon atoms arranged in a hexagonal packing structure.…”