One-Step Electrochemical Synthesis of Cobalt-Doped Fe₂O₂CO₃-Reduced Graphene Oxide Nanocomposites and Their Application for H₂O₂Electro-Catalytic Reduction

Abstract

In this work, cobalt-doped Fe 2 O 2 CO 3 -reduced graphene oxide (Co@Fe 2 O 2 CO 3 -rGO) nanocomposites were synthesized by using one-step electrodeposition. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical methods were used to characterize the nanocomposites. The results showed that the Co@Fe 2 O 2 CO 3 nanoparticles with average 20-40 nm were anchored on the rGO film tightly and the resulting nanocomposites showed excellent electro-catalytic effect toward the reduction of hydrogen peroxide. The determination of hydrogen peroxide was successfully achieved in the high salinity solution (0.5 mol L −1 NaCl) and the calibration curve was observed in the range of 1.5-956 μmol L −1 with the limit of quantitation of 1.5 μmol L −1 and the limit of detection of 0.4 μmol L −1 .

Electrochemical Biosensor Based on Dewdrop-Like Platinum Nanoparticles-Decorated Silver Nanoflowers Nanocomposites for H2O2 and Glucose Detection

“…gold, silver, palladium and platinum) have been applied for manufacture of nonenzymatic electrochemical materials for their high-efficiency catalysis, favorable stability and low cost in recent years. [14][15][16][17][18][19][20] Nevertheless, metal nanoparticles seem to be not so sensitive that can be simply used to fabricate nonenzymatic electrochemical H 2 O 2 sensors. 21,22 By contrast, flower-like nanoparticles exhibit high sensitivity due to the novel nanostructure with petal flat surfaces increasing the probability of contact with the analyte molecules during detection.…”