Electrochemical hydrogen peroxide sensors based on electrospun La_0.7Sr_0.3Mn_0.75Co_0.25O₃ nanofiber modified electrodes

Abstract

The electrochemical detection of hydrogen peroxide in alkaline solution was performed on a La 0.7 Sr 0.3 Mn 0.75 Co 0.25 O 3 (LSMCO) nanofiber modified carbon paste electrode. Perovskite-type oxide LSMCO nanofibers were prepared by electrospinning and calcination. The morphologies, structures, and electrochemical behaviours of the nanofibers were characterized by scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction and cyclic voltammetry. The modified electrode shows excellent electrocatalytic activity towards hydrogen peroxide. Under optimal conditions, the linear response was obtained in the range of 0.5-1000 mM, with high sensitivity and a low limit of detection.

Sensitive Electrochemical Detection of Bioactive Molecules (Hydrogen Peroxide, Glucose, Dopamine) with Perovskites-Based Sensors

“…The complex mechanisms involved in the electrocatalytic oxidation of hydrogen peroxide were deeply analyzed [32]. The partial substitution of the A-site cations by divalent cations such as Ca 2+ , Sr 2+ , and Ba 2+ can lead to an oxidation of the B-site cation as B 3+ [24,25,27,32]. The increasing of this substitution also leads to the reduction in oxygen vacancy formation energy which is consistent with the existence of highly oxidative oxygen species [32].…”

“…The frequency of the use of B ions for the H 2 O 2 detection, among all the published papers (Table 1), is as follows: Co > Ni = Mn > Fe > Ti. A-site ion is mainly La that can be substituted by alkaline ions such as strontium [20,23,27,31,32] or calcium [26].…”

“…The specific surface area of the perovskite can be increased by different preparation procedures, showing that this parameter is also of importance for the analytical performance. Electrospun nanofibers are prepared by mixing La 0.7 Sr 0.3 Mn 0.75 Co 0.25 O 3 [27] and with LaNiO 3 [22] in PVP. Higher sensitivities of detection (more than 1000 µA/mM/cm 2 ) and large dynamic ranges until 1000 µM are obtained.…”

Construction of a Label-Free Electrochemical Immunosensor Based on Zn-Co-S/Graphene Nanocomposites for Carbohydrate Antigen 19-9 Detection

“…The other plausible reason for the selected applied potential of −0.5 V is that the baseline also decreased with a relatively high applied potential (close to −0.5 V), which would also be expected to decrease the reduction-oxidation reactions of the interfering species. So, an applied potential of −0.5 V was chosen as the best applied potential for the subsequent experiments [24,25]. During the stepwise electrochemical immunosensor construction process, the electrochemical behaviors of the stepwise modified electrodes were evaluated by the amperometry and EIS.…”

Ultrasensitive electrospun fluorescent nanofibrous membrane for rapid visual colorimetric detection of H2O2

“…However, there still exists a challenge of developing a simple, highly sensitive, and inexpensive platform for the rapid detection of H 2 O 2 [12,13]. In-depth analyses and studies have pointed out electrospun-based nanofibers to be superior to the conventional ones as sensing devices [14][15][16][17]. Owing to the flexible nature of nanofibrous membranes, these sensors have gained popularity to detect H 2 O 2 using various approaches, which might also be applied in the practical field in the near future.…”