Enzyme-less amperometric sensor manufactured using a Nafion–LaNiO3 nanocomposite for hydrogen peroxide

Abstract

In the present study, an enzyme-less amperometric sensor based on Nafion (NF) and a LaNiO₃ (LNO) nanocomposite was constructed for H₂O₂ detection. LNO from the perovskite group was mixed with NF as an effective solubilizing and stabilizing agent that was used as a novel modifier for modification of the glassy carbon electrode (GCE). The designed sensor showed a desirable electrocatalytic response toward H₂O₂ reduction. The calibration curve revealed two linear portions in the concentration ranges of 0.2–50 μM and 50–3240 μM, and the detection limit was 0.035 μM. The accuracy of the interference-free sensor was checked by recovery analysis in serum samples.