Limitations of potentiometric oxygen sensors operating at low oxygen levels

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Limitations of potentiometric oxygen sensors operating at low oxygen levels. / Lund, Anders; Jacobsen, Torben; Hansen, Karin Vels; Mogensen, Mogens Bjerg.

In: Sensors and Actuators B: Chemical, Vol. 160, No. 1, 2011, p. 1159-1167.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Author

Lund, Anders; Jacobsen, Torben; Hansen, Karin Vels; Mogensen, Mogens Bjerg / Limitations of potentiometric oxygen sensors operating at low oxygen levels.

In: Sensors and Actuators B: Chemical, Vol. 160, No. 1, 2011, p. 1159-1167.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

Bibtex

@article{858499f662714474beaf79a915b6a6c7,
title = "Limitations of potentiometric oxygen sensors operating at low oxygen levels",
publisher = "Elsevier S.A.",
author = "Anders Lund and Torben Jacobsen and Hansen, {Karin Vels} and Mogensen, {Mogens Bjerg}",
year = "2011",
doi = "10.1016/j.snb.2011.09.041",
volume = "160",
number = "1",
pages = "1159--1167",
journal = "Sensors and Actuators B: Chemical",
issn = "0925-4005",

}

RIS

TY - JOUR

T1 - Limitations of potentiometric oxygen sensors operating at low oxygen levels

A1 - Lund,Anders

A1 - Jacobsen,Torben

A1 - Hansen,Karin Vels

A1 - Mogensen,Mogens Bjerg

AU - Lund,Anders

AU - Jacobsen,Torben

AU - Hansen,Karin Vels

AU - Mogensen,Mogens Bjerg

PB - Elsevier S.A.

PY - 2011

Y1 - 2011

N2 - The electrochemical processes that limit the range of oxygen partial pressures in which potentiometric oxygen sensors can be used, were analysed using a theoretical and an experimental approach. Electrochemical impedance spectroscopy was performed on porous Pt/yttria stabilised zirconia (YSZ) electrodes between 10−6 and 0.2 bar and at temperatures between 500 and 950 °C. The flow of oxide ions and electron holes through a sensor cell, with a YSZ electrolyte, were calculated under similar conditions. The oxygen permeation of the sensor cell was insignificant at an oxygen partial pressure of 10−6 bar for an inlet flow rate higher than 2 L h−1 between 600 and 800 °C. The polarisation resistance measured between 10−6 and 10−4 bar was found to be inversely proportional to the oxygen partial pressure, nearly temperature independent and inversely proportional to the inlet gas flow rate, which shows that gas phase mass transport processes were dominating. The time constant of the gas phase mass transport processes was found to be inversely proportional to the oxygen partial pressure. The response time of these processes therefore limits the oxygen partial pressure range in which potentiometric oxygen sensors can be used.

AB - The electrochemical processes that limit the range of oxygen partial pressures in which potentiometric oxygen sensors can be used, were analysed using a theoretical and an experimental approach. Electrochemical impedance spectroscopy was performed on porous Pt/yttria stabilised zirconia (YSZ) electrodes between 10−6 and 0.2 bar and at temperatures between 500 and 950 °C. The flow of oxide ions and electron holes through a sensor cell, with a YSZ electrolyte, were calculated under similar conditions. The oxygen permeation of the sensor cell was insignificant at an oxygen partial pressure of 10−6 bar for an inlet flow rate higher than 2 L h−1 between 600 and 800 °C. The polarisation resistance measured between 10−6 and 10−4 bar was found to be inversely proportional to the oxygen partial pressure, nearly temperature independent and inversely proportional to the inlet gas flow rate, which shows that gas phase mass transport processes were dominating. The time constant of the gas phase mass transport processes was found to be inversely proportional to the oxygen partial pressure. The response time of these processes therefore limits the oxygen partial pressure range in which potentiometric oxygen sensors can be used.

KW - Solid Oxide Fuel Cells

KW - Oxygen

KW - Potentiometric

KW - Sensor

KW - Zirconia

KW - Electrochemistry

U2 - 10.1016/j.snb.2011.09.041

DO - 10.1016/j.snb.2011.09.041

JO - Sensors and Actuators B: Chemical

JF - Sensors and Actuators B: Chemical

SN - 0925-4005

IS - 1

VL - 160

SP - 1159

EP - 1167

ER -