Low‐Potential Sensitive Hydrogen Peroxide Detection Based on Nanotubular TiO2 and Platinum Composite Electrode |
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Authors: | Xiaoli Cui Zhizhou Li Yanchao Yang Wei Zhang Qingfei Wang |
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Institution: | 1. Department of Materials Science, Fudan University, Shanghai, 200433, P.?R. China;2. College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, 050016, P.?R. China |
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Abstract: | In this work, a novel sensor for detecting hydrogen peroxide was constructed on the base of nanotubular TiO2 and platinum nanoparticles. The morphology, structural, and electrochemical properties of the Pt/TiO2 nanocomposite electrodes were characterized by SEM, XRD and electrochemical methods. With an operating potential of +0.3 V versus Ag/AgCl, the sensor produces catalytic oxidation currents at the nanocomposite electrode, which can be exploited for quantitative determinations. The amperometric signals are linearly proportional to hydrogen peroxide concentration in the range 4×10?6 to 1.25×10?3 M. The regression equation is I (μA)=0.85 c (mM)+0.16 with a correction coefficient of 0.997. At a signal‐to‐noise ratio of 3, a detection limit of 4.0 μM H2O2 can be observed for the nanocomposite electrode. In addition, the sensor has a good stability and reproducibility. The construction process is simple and inexpensive. The results demonstrated that nanotubular TiO2 exhibits great prospect for developing a class of ideal and novel bioreactors and biosensors. |
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Keywords: | Nanotubular TiO2 Platinum nanoparticles Amperometric response Hydrogen peroxide sensor |
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