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A glassy carbon electrode modified with poly(anthranilic acid), poly(diphenylamine sulfonate) and CuO nano-particles for the sensitive determination of hydrogen peroxide |
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| Authors: | Haiyan Song Yongnian Ni Serge Kokot |
| Institution: | 1. State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, China 2. Department of Chemistry, Nanchang University, Nanchang, 330031, China 3. School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane, 4001, Australia |
| Abstract: | We report on a modified glassy carbon electrode (GCE) for sensing hydrogen peroxide (H2O2). It was constructed by consecutive electrochemical deposition of poly(anthranilic acid) and poly(diphenylamine sulfonate) on the GCE, followed by the deposition of copper oxide (CuO). The morphology and electrochemistry of the modified electrode was characterized by atomic force microscopy, X-ray diffraction, cyclic voltammetry, and electrochemical impedance spectroscopy. The catalytic performance of the sensor was studied with the use of differential pulse voltammetry under optimized conditions. This sensor displayed significantly better electrocatalytic activity for the reduction of H2O2 in comparison to a GCE without or with modification with CuO or polymer films alone. The response to H2O2 is linear in the range between 0.005 to ~11 mM, and the detection limit is 0.18 μM (at an S/N of 3). A new bio-mimetic sensor, CuO/PANA@PSDS/GCE, was prepared, it exhibited a better electrocatalytic activity toward the reduction of the H2O2 compared with that of the CuO/GCE, PANA@PSDS/GCE, and GCE. Its increased catalytic response was due to the polyaniline doped (PANA@PSDS) film, which enlarges the specific surface area of the electrode, and increases the loading of the CuO nano-particles. |
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