Synthesis of silver decorated sea urchin-like FeOOH nanocomposites and its application for electrochemical detection of hydrogen peroxide

The sea urchin-like Ag/FeOOH nanocomposites were prepared by a simple method, and a new enzymeless hydrogen peroxide (H2O2) sensor was fabricated by fixing Ag/FeOOH on a gold (Au) electrode. X-ray diffraction spectroscopy field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy were employed to study the composition and morphology of Ag/FeOOH. TEM and FESEM images revealed that a great deal of Ag nanoparticles with spherical morphologies were fixed on the surface of sea urchin-like FeOOH. The electrochemical investigations indicated that the Ag/FeOOH nanocomposites possessed remarkable capability for the electricalreduction of H2O2 and showed a linear response for the detection of H2O2 in the range of 0.03–15.0 mM with a detection limit of 1.3 μM (S/N = 3). Future, this sensor exhibited acceptable reproducibility and good anti-interference ability.