Abstract
An electrochemical sensor is developed in this work based on the new perovskite-type nanomaterial LaNiTiO3–Fe3O4 for sensitive determination of o-phenylenediamine (OPD). As-synthesized materials and the surface of as-fabricated electrochemical sensor are characterized by X-ray diffraction, atomic force microscope, and electrochemical impedance spectroscopy, respectively. The results of characterizations depict that the sample is of nanoscaled complex oxides consisting of perovskite structure and spinel structure, and has good conductive properties. The construction and experimental conditions of the electrochemical sensor are also optimized. The electrochemical properties of OPD at glassy carbon electrode modified with LaNiTiO3–Fe3O4 are investigated in alkaline solution (NaOH). The new electrochemical sensor exhibits high electrocatalytic activity and stability in NaOH, and a promotion of electrochemical oxidation of OPD at low potentials can be obviously observed. A wide linear range is obtained from 1.0 × 10−6 to 7.0 × 10−3 M with a relative low detection limit of 0.15 μM (S/N = 3) under optimal conditions. Furthermore, the sensor exhibits reliable results for the determination of OPD in commercial samples.
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Acknowledgments
This work is supported by the National Nature Science Foundation of China (Grant No. 61001035), the “Chen Guang” project of the Shanghai Municipal Education Commission and Shanghai Education Development Foundation (No. 10CG42) and the Innovation Program of Shanghai Municipal Education Commission (No. 12YZ004).
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Zhou, Y., Xu, Y., Zhu, X. et al. Direct electrochemical sensing of ο-phenylendiamine based on perovskite-type nanomaterial LaNiTiO3–Fe3O4 . J Solid State Electrochem 18, 1973–1979 (2014). https://doi.org/10.1007/s10008-014-2406-2
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DOI: https://doi.org/10.1007/s10008-014-2406-2