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

Abstract

In this work, a novel sensor for detecting hydrogen peroxide was constructed on the base of nanotubular TiO 2 and platinum nanoparticles. The morphology, structural, and electrochemical properties of the Pt/TiO 2 nanocomposite electrodes were characterized by SEM, XRD and electrochemical methods. With an operating potential of þ 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 Â 10 À6 to 1.25 Â 10 À3 M. The regression equation is I (mA) ¼ 0.85 c (mM) þ 0.16 with a correction coefficient of 0.997. At a signal-to-noise ratio of 3, a detection limit of 4.0 mM H 2 O 2 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 TiO 2 exhibits great prospect for developing a class of ideal and novel bioreactors and biosensors.

Highly sensitive H2O2 sensor based on Co3O4 hollow sphere prepared via a template-free method

“…We can see that the sensitivity, detection limit, linear range, and response time of our sensor are comparable and even better than those obtained by other modified electrodes [23,[27][28][29][30][31][32][53][54][55][56][57][58][59]. Salimi et al [23] …”

Immobilization of horseradish peroxidase in three-dimensional macroporous TiO2 matrices for biosensor applications

“…6b). The sensitivity of 102.92 A/mM for H 2 O 2 detection under UV light is higher than those of 25.02 A/mM for hemoglobin on TiO 2 nanoparticles [15], 61.5 A/mM for HRP in porous titania sol-gel matrix [22], and 0.85 A/mM for HRP absorbed on nanotubular TiO 2 and platinum composite electrode [23]. Good biocompatibility of TiO 2 and the excellent photoelectrical properties and large effective surface of the three-dimensionally ordered macroporous structure are also advantageous for the photoelectrocatalysis.…”

Voltammetric and amperometric determination of hydrogen peroxide using a carbon-ceramic electrode modified with a nanohybrid composite made from single-walled carbon nanotubes and silver nanoparticles

“…Therefore, in recent years, there has been a considerable interest in the accurate determination of H 2 O 2 . Many techniques have been employed in the determination of H 2 O 2 , including titrimetry [3], spectrophotometer [4], chemiluminescence [5,6], and electrochemistry [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Among these methods the electrochemical techniques, based on the simplicity, high sensitivity, good stability, low-cost instrumentation and onsite monitoring, have been extensively applied for accurate determination of H 2 O 2 .…”