One-pot fabrication of AuNPs-Prussian blue-Graphene oxide hybrid nanomaterials for non-enzymatic hydrogen peroxide electrochemical detection

AuNPs-Prussian blue-Graphene oxide (AuNPs-PB-GO) hybrid nanomaterials were prepared through a facile one-pot strategy. It was combined redox reaction and co-precipitation reaction. In the process, Ferrous ion both acted as a reductant and a co-precipitation agent. And then, a novel hydrogen peroxide (H₂O₂) electrochemical sensor based on the hybrid materials was constructed. Experimental characterizations of the as-prepared nanocomposites were utilized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS). These results indicated AuNPs with an average diameter of approximately 30 nm were successfully loaded on the surface of PB-GO nanomaterials. In addition, electrochemical investigations demonstrated that the proposed sensor had superior performance for H₂O₂ catalysis. The linear current response to H₂O₂ concentration was calculated to be from 3.8 to 5400 μM with a detection limit of 1.3 μM and a sensitivity of 87.6 μA (mM)⁻¹ cm⁻². Moreover, the constructed sensor exhibited excellent stability, repeatability, and anti-interference ability for the determination of H₂O₂. Inspired by the fascinating preparation procedure of hybrid materials and unique electrocatalytic activities, it could enrich and extend the application of nanomaterials in electrochemical sensing.