The Sensitive and Selective Enzyme-Free Electrochemical H2O2 Sensor Based on rGO/MnFe2O4 Nanocomposite

The reduced graphene oxide/manganese ferrite (rGO/MnFe 2 O 4 ) composite was prepared via a simple and straight forward solvothermal technique. The well-defined and mono-dispersed MnFe 2 O 4 spherical particles with the average particle size of 370 nm, composing of 10-nm-sized primary nanoparticles were densely anchored over MnFe 2 O 4 composite cons support. The cubic spinel structure of MnFe 2 O 4 nanoparticles was unfurled through the diffraction patterns, and its compilation with rGO to form composite has sustained the structure, morphology, and size of MnFe 2 O 4 . The as-prepared rGO/MnFe 2 O 4 composite exhibited superior electrocatalytic activity toward the enzyme-free H 2 O 2 detection under neutral conditions. The as-fabricated rGO/MnFe 2 O 4 /glassy carbon electrode (GCE) exhibited an excellent enzyme-free H 2 O 2 detection with a wide linear range of 1 μM–22 mM, a lower limit of detection of 0.35 μm ( S / N = 3), and a considerable sensitivity of 1180 μA mM −1 cm −2 . Furthermore, rGO/MnFe 2 O 4 /GCE demonstrated the high selectivity toward H 2 O 2 without the influence of other electroactive species and exhibited the prompt recovery in the range of 97.84–102.23% toward real sample analysis, which ensured the viable applications of rGO/MnFe 2 O 4 composite in electrochemical enzyme-free H 2 O 2 sensors. Graphical Abstract ᅟ