Non-Enzymatic Amperometric Detection of H2O2 on One-Step Electrochemical Fabricated Cu2O/Electrochemically Reduced Graphene Oxide Nanocomposite

In this study, we present a new approach to electrochemical growth of Cu2O/electrochemically reduced graphene oxide (Cu2O/ERGO) nanostructures that are based on simultaneous co-reduction of both copper ions and graphene oxide from an aqueous suspension on gold electrode. The X-ray diffraction (XRD) spectra of as-prepared Cu2O/ERGO electrode showed that Cu2O and graphene structures in composite nanostructures. The SEM image exhibited that combining the crumpled ERGO and nanocubes shapes of Cu2O in nanocomposite stucture. The Cu2O/ERGO nanocomposite electrode exhibits good electrocatalytic activity toward detection of non-enzymatic H2O2, compared to bare Au and Au/Cu2O electrodes, in terms of low working potential and high current density. The linear detection range for H2O2 is 1-1000 mu M while the detection limit is 0.14 mu M. Furthermore, a very high sensitivity is achieved with 168.2 mA mM(-1) cm(-2) estimated for H2O2. These results suggest that Cu2O/ERGO nanocomposites thus easily prepared through an electrochemical co-reduction method are promising electrode materials for biosensor application.