Abstract
An ultrahigh selective and sensitive hydrogen peroxide electrochemical sensor was developed based on palladium nanoparticles and nafion-modified electrode in enzyme-free conditions. The surface morphology of the fabricated electrode was characterized by using field emission scanning electron microscopy and electrochemical impedance spectroscopy. The fabricated sensor displayed an excellent electrocatalytic reduction of hydrogen peroxide (H2O2) at −0.2 V. The as-prepared-modified electrode displayed a very fast amperometric response (<2 s) of H2O2, indicating excellent electrocatalytic performance of the modified electrode. The sensor showed wide linear range response from 0.1 μM to 9 mM with a limit of detection of 0.018 μM for the determination of H2O2. In addition, the sensor displayed a high sensitivity of 0.766 μA μM−1 cm−2 with acceptable repeatability, reproducibility, and stability. The developed H2O2 sensor is highly selective even in the presence of higher concentrations of the potentially interfering species. The good practicality of the sensor indicates that it could be used as a good potential candidate for the real-time sensing of H2O2.
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This work was supported by the National Science Council and the Ministry of Education of Taiwan (Republic of China).
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Novelty of this work
• For the first time, we reported an ultrahigh sensitive and selective H2O2 electrochemical sensor based on Pd-NPs and nafion-modified electrode.
• As far as we know, the obtained sensitivity, linear response, and detection limit are the best among all previously reported H2O2 sensors based on Pd-NP nanostructures.
• The Pd-NPs were prepared by simple electrochemical deposition, which is a more convenient method for fabrication of uniform sized Pd-NPs when compared with other exiting methods.
• We used negatively charged nafion polymer onto the Pd-NPs electrodeposited electrode for the ultra selective determination of H2O2.
• The modified electrode demonstrates ultra sensitive and selective towards H2O2.
• The sensor displayed excellent long-term stability (60 days).
• The excellent recovery results of the sensor in commercial H2O2 containing lens solutions and urine samples reveal that it could be used as a good potential candidate for the real-time sensing of H2O2.
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Karuppiah, C., Palanisamy, S. & Chen, SM. An Ultrahigh Selective and Sensitive Enzyme-Free Hydrogen Peroxide Sensor Based on Palladium Nanoparticles and Nafion-Modified Electrode. Electrocatalysis 5, 177–185 (2014). https://doi.org/10.1007/s12678-013-0180-z
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DOI: https://doi.org/10.1007/s12678-013-0180-z