Non-Nernstian planar sensors based on YSZ with a Nb2O5 electrode

Chevallier, Laure; Bartolomeo, Elisabetta Di; Grilli, Maria Luisa; Mainas, Marina; White, Briggs M.; Wachsman, Eric D.; Traversa, Enrico

doi:10.1016/j.snb.2007.09.037

Cited by 57 publications

(48 citation statements)

References 32 publications

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“…Alternative approach was proposed by Wachsman et al, namely "Differential Electrode Equilibria," which particularly elucidates the sensing behavior of the sensor using semiconducting oxide SE [87][88][89]. This theory also takes gas-phase reaction and electrochemical reaction into account, when explaining the sensing mechanism.…”

Section: Sensing Mechanismmentioning

confidence: 99%

A review of mixed-potential type zirconia-based gas sensors

Miura

Sato

Anggraini

et al. 2014

Ionics

282

166

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A robust and reliable gas sensing device is considered as a convenient and practical solution for gas concentration monitoring that has become a mandatory requirement in different field of applications. For in situ hazardous gases detection, a mixed-potential type gas sensor has been regarded as a promising solid-state gas sensor. For the past three decades, there has been a significant progress in achieving high performance in mixed-potential type sensors. Therefore, this review is focused on reporting the development of mixedpotential type gas sensors with combined yttria-stabilized zirconia (YSZ) as the base solid electrolyte material and various classes of electrode materials for their potential utilization as a high-performance sensing electrode. The underlying sensing mechanism of a mixed-potential type YSZ-based sensor is elaborated here in detail. Transformation in design and configuration of this type of sensor is also covered in this report. In addition, recent progresses on mixed-potential type gas sensors development for detection of several target gases, such as carbon monoxide, hydrocarbons, nitrogen oxides, hydrogen, and ammonia, are reviewed. Strategies to improve the sensing characteristic, particularly gas sensitivity and selectivity, are also reported. Based on the understanding of the fundamental sensing mechanism and the requirements for high-performance gas sensors, challenges and future trends for this type of gas sensor development are discussed.

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Section: Sensing Mechanismmentioning

confidence: 99%

A review of mixed-potential type zirconia-based gas sensors

Miura

Sato

Anggraini

et al. 2014

Ionics

282

166

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“…In regard of conventional electrochemical sensors with a physical separation between the two electrodes, these sensors have their two electrodes in the same atmosphere. These sensors are usually called "Non-Nernstian" potentiometric sensors [11,12] or "Mixed Potential" sensors [13,14]. They present a dissymmetry of electrodes and the response is connected to the differences of the electrochemical reactions occurring at both electrodes.…”

Section: Discussionmentioning

confidence: 99%

Detection of CO in H2-rich gases with a samarium doped ceria (SDC) sensor for fuel cell applications

Pijolat¹,

Tournier²,

Viricelle³

2009

Sensors and Actuators B: Chemical

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International audienceAn original sensor has been studied in order to detect low CO concentration in h2-rich atmosphere for pem (protonic exchange membrane) fuel cell applications. The SCD (samarium doped ceria) sensor is a potentiometric sensor working with an electrode dissymmetry Au/Pt. The originality of this sensor is mainly working with the two electrodes in the same atmosphere without a reference cell. The Δ (emf) response, defined by the difference between the emf (electromotive force) value under carrier gas and the emf value under CO, is correlated with the CO concentration. Experiments have been carried out on a laboratory testing bench, either with a large measurement cell equipped with a hot plate and two mobile gold points as electrical contacts or in a small cell with self-heated sensors supplied with a platinum heater on the reverse side of the substrate. Responses to low CO concentrations (0-4000 ppm v/v) in H2-rich gases (5% v/v) varies between 25 and 100 mV, but saturation is observed beyond 400 ppm v/v of CO. In wet atmosphere, the sensitivity is partially reduced but the sensor response remains perfectly usable. At the moment no satisfying model can be used to explain the experimental results. Nevertheless, the performances of these SCD sensors appear sufficiently good to satisfy the fuel cell application

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“…In oxygen-rich atmosphere, in presence of NO 2 , a mixed potential is established between the oxygen electrode reaction and the electrochemical reduction of NO 2 [3,30].…”

Section: No 2 Sensing Performancesmentioning

confidence: 99%

Application of advanced morphology Au–X (X=YSZ, ZrO2) composites as sensing electrode for solid state mixed-potential exhaust NOx sensor

Romanytsia

Viricelle

Vernoux

et al. 2015

Sensors and Actuators B: Chemical

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a b s t r a c tAmong various NO x sensors developments, mixed potential sensor based on Yttria Stabilized Zirconia (YSZ) with a simple planar architecture Au/YSZ/Pt is of practical interest. Au composites electrodes were investigated to improve sensing performances. Such potentiometric solid-state gas sensors -were fabricated by screen-printing and tested for NO 2 detection. Electrochemical impedance spectroscopy has shown that the addition of YSZ in the Au electrode decreased the polarization resistance in air. In addition, the (Au + 10 wt% YSZ)/YSZ/Pt sensor has a shorter response time and higher sensitivity to NO 2 (range 20-100 ppm) at 450-550 • C in comparison with a reference Au/YSZ/Pt sensor. On the other hand, the addition of non-conductive ZrO 2 does not significantly modify the electrochemical property but strongly damages the sensor responses toward NO 2 .

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Non-Nernstian planar sensors based on YSZ with a Nb2O5 electrode

Cited by 57 publications

References 32 publications

A review of mixed-potential type zirconia-based gas sensors

A review of mixed-potential type zirconia-based gas sensors

Detection of CO in H2-rich gases with a samarium doped ceria (SDC) sensor for fuel cell applications

Application of advanced morphology Au–X (X=YSZ, ZrO2) composites as sensing electrode for solid state mixed-potential exhaust NOx sensor

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