Sensors 2003, 3(8), 290-303; doi:10.3390/s30800290
Article

On the Electrooxidation and Amperometric Detection of NO Gas at the Pt/Nafion® Electrode

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Received: 22 May 2003; Accepted: 3 June 2003 / Published: 22 August 2003
(This article belongs to the Special Issue Nitric Oxide Sensors and Their Applications in Biomedical Research)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: The electrochemical oxidation of nitric oxide (NO) gas at the Pt/Nafion® electrode has been studied at a concentration of 500 ppm. The electrooxidation of NO taking place over a wide potential range can be described by a transcendental equation, from which the half-wave potential of the reaction can be determined. For NO oxidation with appreciable overpotentials but negligible mass-transfer effects, the Tafel kinetics applies. The obtained charge transfer coefficient (a) and the exchange current density (io) are 0.77 and 14 mA/cm2, respectively. An amperometric NO gas sensor based on the Pt/Nafion® electrode has been fabricated and tested over the NO concentration range from 0 to 500 ppm. The Pt/Nafion® electrode was used as an anode at a fixed potential, preferably 1.15 V (vs. Ag/AgCl/sat. KCl), which assures current limitation by diffusion only. The sensitivity of the electrochemical sensor was found to be 1.86 mA/ppm/cm2. The potential interference by other gases, such as nitrogen dioxide (NO2) and carbon monoxide (CO), was also studied in the range 0-500 ppm. Both sensitivity for NO and selectivity of NO over NO2/CO show significant enhancement upon using a cyclic voltammetric (CV) activation, or cleaning procedure.
Keywords: Amperometric sensor; Interference gas; Nitric oxide (NO); Pt/Nafionâ electrode; Sensitivity
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MDPI and ACS Style

Ho, K.-C.; Hung, W.-T.; Yang, J.-C. On the Electrooxidation and Amperometric Detection of NO Gas at the Pt/Nafion® Electrode. Sensors 2003, 3, 290-303.

AMA Style

Ho K-C, Hung W-T, Yang J-C. On the Electrooxidation and Amperometric Detection of NO Gas at the Pt/Nafion® Electrode. Sensors. 2003; 3(8):290-303.

Chicago/Turabian Style

Ho, Kuo-Chuan; Hung, Wen-Tung; Yang, Jin-Cherng. 2003. "On the Electrooxidation and Amperometric Detection of NO Gas at the Pt/Nafion® Electrode." Sensors 3, no. 8: 290-303.

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