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Sensors 2015, 15(9), 24573-24584; doi:10.3390/s150924573

Effect of Electrode Configuration on Nitric Oxide Gas Sensor Behavior

and
†,*
Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA 71272, USA
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 30 June 2015 / Accepted: 16 September 2015 / Published: 23 September 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
View Full-Text   |   Download PDF [705 KB, uploaded 23 September 2015]   |  

Abstract

The influence of electrode configuration on the impedancemetric response of nitric oxide (NO) gas sensors was investigated for solid electrochemical cells [Au/yttria-stabilized zirconia (YSZ)/Au)]. Fabrication of the sensors was carried out at 1050 °C in order to establish a porous YSZ electrolyte that enabled gas diffusion. Two electrode configurations were studied where Au wire electrodes were either embedded within or wrapped around the YSZ electrolyte. The electrical response of the sensors was collected via impedance spectroscopy under various operating conditions where gas concentrations ranged from 0 to 100 ppm NO and 1%–18% O2 at temperatures varying from 600 to 700 °C. Gas diffusion appeared to be a rate-limiting mechanism in sensors where the electrode configuration resulted in longer diffusion pathways. The temperature dependence of the NO sensors studied was independent of the electrode configuration. Analysis of the impedance data, along with equivalent circuit modeling indicated the electrode configuration of the sensor effected gas and ionic transport pathways, capacitance behavior, and NO sensitivity. View Full-Text
Keywords: NOx sensors; diesel emissions; electrode configuration; porous YSZ electrolytes; impedance spectroscopy NOx sensors; diesel emissions; electrode configuration; porous YSZ electrolytes; impedance spectroscopy
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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. (CC BY 4.0).

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Cui, L.; Murray, E.P. Effect of Electrode Configuration on Nitric Oxide Gas Sensor Behavior. Sensors 2015, 15, 24573-24584.

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