Low‐Potential Sensitive Hydrogen Peroxide Detection Based on Nanotubular TiO2 and Platinum Composite Electrode

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.