Advances in magnetic field-assisted electrolyte's physicochemical properties and electrokinetic parameters: A case study on the response ability of chloramphenicol on Fe3O4@carbon spheres-based electrochemical nanosensor

A molybdenum disulfide/nickel ferrite-modified voltammetric sensing platform for ultra-sensitive determination of clenbuterol under the presence of an external magnetic field

“…It is interesting to see that the obtained results fitted well with the CV response and separation potential (Δ E p ) of all electrodes recorded. Worthy of note, the R ct value was employed to estimate the standard heterogeneous rate constant ( k et ) for all electrodes: 23,29,45 k et = RT /( n 2 F 2 R ct AC o )here R , T , and F are used with their usual meaning, A donates electrochemical active area (cm 2 ), C o refers to the bulk concentration of [Fe(CN) 6 ] 3−/4− , R ct implies the electron transfer resistance (Ω). The k et value was found for the bare SPE, NFO/SPE, MoS 2 /NFO, MoS 2 –NFO (1 : 1)/SPE, and MoS 2 –NFO (2 : 1)/SPE to be around 7.1 × 10 −4 , 1.15 × 10 −3 , 1.27 × 10 −3 , 1.23 × 10 −3 , and 1.27 × 10 −3 , respectively.…”

“…In our previous research, the positive inuence of external stationary MF on electrochemical behaviors of Fe 3 O 4 -carbon spheres based-electrode as well as its sensing performance towards detecting chloramphenicol was thoroughly reported. 8,29,30,32,[49][50][51] Some impact mechanisms were proposed, explaining for the enhancement in mass transfer, ionic/charge diffusion in the electrolyte solution, as well as higher absorption capacity and better electrocatalytic ability at modied electrodes. According to this inevitable trend, the utilization of MF with the aim of promoting the inherent electrochemical characteristics of MoS 2 -NFO (2 : 1)/SPE such as electrical conductivity, adsorption capability, and electrocatalytic activity was carried out.…”

“…6a and d, the linear increase of current response for diffusion-limited electrocatalytic techniques vs. t −1/2 were found at various concentrations in both two cases. Based on Cottrell's equation: 29,52,53 Fig. 6…”

“…Particularly, as demonstrated in our previous reports, the positive effect of the presence of the external magnetic elds on electrochemical behaviors and sensing performance was demonstrated. [29][30][31][32] Herein, the inuence of external magnetic eld (MF) on the MoS 2 -NFO (2 : 1)/SPE was also further evaluated, contributing to optimizing the new research in the future. 6,7,14 Firstly, dissolved solutions of 0.3 M NiCl 2 and 0.3 M FeCl 3 were mixed under magnetic stirring for 30 min.…”

“…It is interesting to see that the obtained results tted well with the CV response and separation potential (DE p) of all electrodes recorded. Worthy of note, the R ct value was employed to estimate the standard heterogeneous rate constant (k et ) for all electrodes:23,29,45…”