Electrode materials for potentiometric hydrogen sensors

“…As shown in Fig. 19, the composite SEs using Au and some oxides (such as Nb 2 O 5 and Ta 2 O 5 ) were reported to yield higher H 2 sensitivity, compared with the other oxides examined [158].…”

Section: H 2 Sensormentioning

confidence: 93%

“…For example, Zosel et al reported the utilization of the composite SE comprising Au and metal oxide in a planar sensor configuration [158]. As shown in Fig.…”

Section: H 2 Sensormentioning

confidence: 99%

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

Miura

Sato

Anggraini

et al. 2014

Ionics

295

175

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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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“…Quite recently, we have reported that the addition of noble metals (Rh or Au) to NiO-SE was found to improve largely the NO 2 sensitivity [17,20]. In fact, it should be noticed that the noble metals, especially Au, and Au-doped materials are widely used in many kinds of gas sensors, such as semiconducting sensors [21] and also mixed-potential-type sensors for detection of carbon monoxide [22,23], hydrocarbons [8,22,24,25], or hydrogen [26].…”

Section: Introductionmentioning

confidence: 99%

Zirconia-based planar NO2 sensor using ultrathin NiO or laminated NiO–Au sensing electrode

Plashnitsa

Ueda

Elumalai

et al. 2007

Ionics

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The nanostructured thin NiO films with the thicknesses of 30-180 nm were examined as a sensing electrode (SE) for the planar mixed-potential-type yttriastabilized zirconia (YSZ)-based NO 2 sensor. The sensing characteristics were examined in the temperature range of 600-800°C under the wet condition (5 vol.% water vapor).Among the NiO-SEs tested, the 60 nm-thick NiO-SE sintered at 1,000°C was found to give the highest NO 2 sensitivity in the NO 2 concentration range of 50-400 ppm accompanying with fast response/recovery at the operating temperatures of 600-700°C. The high NO 2 sensitivity was attributed to the high catalytic activity for both electrochemical reactions of O 2 and NO 2 at the interface of NiO-SE/YSZ. The ultrathin gold layer with the thickness of about 60 nm was additionally formed on the 60 nm-thick NiO-SE to fabricate the laminated-type (60 nm NiO/60 nm Au)-SE. It was demonstrated that the use of this laminated (NiO-Au)-SE improved both the sensitivity and the selectivity to NO 2 .

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Electrode materials for potentiometric hydrogen sensors

Cited by 43 publications

References 11 publications

Selective mixed potential ammonia exhaust gas sensor

Selective mixed potential ammonia exhaust gas sensor

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

Zirconia-based planar NO2 sensor using ultrathin NiO or laminated NiO–Au sensing electrode

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