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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

* ,  and
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 10617, ROC
* Author to whom correspondence should be addressed.
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)
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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 Amperometric sensor; Interference gas; Nitric oxide (NO); Pt/Nafionâ electrode; Sensitivity
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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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.

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