Hierarchical Gadolinium Oxide Microspheres for Enzymeless Electro‐biosensors in Hydrogen Peroxide Dynamic Detection

A porous gadolinium oxide spherically hierarchical structure (Gd2O3-ms) has been developed by hydrothermal method in order to perform enzymeless dynamic detection of hydrogen peroxide (H2O2), based on its high sensitivity in electro-catalytic reduction of H2O2. X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, transmission electron microscopy and high resolution transmission electron microscopy have assisted in shedding light on the morphology, material formation process, structure and properties of the porous gadolinium oxide microspheres. The linear range from 1 to 450 µM (linear correlation coefficient 0.991), sensitivity of 13.9 µA mM-1, fine detection limit with a prompt current response attaining stable value were achieved by this enzymeless sensor, which was also employed to implement the dynamic tracing of H2O2 releasing processes.