Next Article in Journal / Special Issue
The Electrochemical Detremination of Nitric Oxide in Seawater Media with Microelectrodes
Previous Article in Journal / Special Issue
The NO2 sensing ITO thin films prepared by ultrasonic spray pyrolysis
Article Menu

Export Article

Open AccessArticle
Sensors 2003, 3(8), 290-303; https://doi.org/10.3390/s30800290

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

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)
Full-Text   |   PDF [287 KB, uploaded 20 June 2014]   |  

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. View Full-Text
Keywords: Amperometric sensor; Interference gas; Nitric oxide (NO); Pt/Nafionâ electrode; Sensitivity Amperometric sensor; Interference gas; Nitric oxide (NO); Pt/Nafionâ electrode; Sensitivity
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
SciFeed

Share & Cite This Article

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.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top