Planar potentiometric SO2 gas sensor for high temperatures using NASICON electrolyte combined with V2O5/WO3/TiO2 + Au or Pt electrode

Izu, Noriya; Hagen, Gunter; Schönauer, Daniela; Röder-Roith, Ulla; Moos, Ralf

doi:10.2109/jcersj2.119.687

Cited by 23 publications

(15 citation statements)

References 19 publications

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“…There is no information about crack formation in NASICON upon heating and cooling or due to thermal shock reported in the literature and the properties such as these has led to NASICON being used as solid electrolyte in planar gas sensors in form of thick films 3,6,8,10,12,13 .…”

Section: Introductionmentioning

confidence: 99%

New insight into the electrical properties and ion dynamics of screen printed NASICON thick films

Mudenda

Kale

2015

J. Mater. Chem. A

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Although AC conductivity measurements of NASICON is well documented in literature, thick film conductivity and ion dynamic studies, important for planar, are scarcely reported. Most thick film measurements are performed using four point probe methods (DC method) and are quite limited in that, they cant give information on ion dynamics and cannot seperate contributions from grains, grain boundaries and electrode effects. However, in this paper we report the electrical properties of NASICON, x = 1.95 thick films of different thicknesses (20-32 µm), screen printed on alumina substrates, in light of ionic dynamics using the AC conductivity formalism. Surface resistivities of thick films from impedance data in the frequency range 0.1 ≤ f (HZ) ≤ 3.2 × 10 7 is obtained. Impedance Cole-Cole plots shows grain interior and electrode effects. The hopping frequency and AC/DC conductivity are thermally activated and show Arrhenius-type behaviour, with activation energies in the range of 0.44 ≤ E a (eV ) ≤ 0.46. Scaling in conductivity and Modulus shows that the relaxation mechanisms are independent of temperature and film thickness. Conductivity was independent of film thickness at high temperatures. SEM reveals that there is a minimum thickness for which NASICON on alumina substrate can be printed and used in high temperature planar electrochemical devices.

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Section: Introductionmentioning

confidence: 99%

New insight into the electrical properties and ion dynamics of screen printed NASICON thick films

Mudenda

Kale

2015

J. Mater. Chem. A

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“…Several types of solid electrolytes sensors with sulfate compounds have been studied [10][11][12], and showed good sensitivity and selectivity towards SO 2 at high temperature operation.…”

Section: Introductionmentioning

confidence: 99%

SiC–FET based SO2 sensor for power plant emission applications

Darmastuti

Bur

Möller

et al. 2014

Sensors and Actuators B: Chemical

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Thermal power plants produce SO 2 during combustion of fuel containing sulfur. One way to decrease the SO 2 emission from power plants is to introduce a sensor as part of the control system of the desulphurization unit. In this study, SiC-FET sensors were studied as one alternative sensor to replace the expensive FTIR (Fourier Transform Infrared) instrument or the inconvenient wet chemical methods. The gas response for the SiC-FET sensors comes from the interaction between the test gas and the catalytic gate metal, which changes the electrical characteristics of the devices. The performance of the sensors depends on the ability of the test gas to be adsorbed, decomposed, and desorbed at the sensor surface. The feature of SO 2 , that it is difficult to desorb from the catalyst surface, makes it known as catalyst poison.It is difficult to quantify the SO 2 with static operation, even at the optimum operation temperature of the sensor due to low response levels and saturation already at low concentration of SO 2 . The challenge of SO 2 desorption can be reduced by introducing dynamic operation in a designed temperature cycle operation (TCO). The intermittent exposure to high temperature can help to desorb SO 2 . Simultaneously, additional features extracted from the sensor data can be used to reduce the influence of sensor drift. The TCO operation, together with pattern recognition, may also reduce the baseline and response variation due to changing concentration of background gases (4-10% O 2 and 0-70% RH), and thus it may improve the overall sensor performance. In addition to the laboratory experiment, testing in the desulphurization pilot unit was performed. Desulphurization pilot unit has less controlled environment compared to the laboratory conditions. Therefore, the risk of influence from the changing concentration of background gas is higher. In this study, Linear Discriminant Analysis (LDA) and Partial Least Square (PLS) were employed as pattern recognition methods. It was demonstrated that using LDA quantification of SO 2 into several groups of concentrations up to 2000 ppm was possible. Additionally, PLS analysis indicated a good agreement between the predicted value from the model and the SO 2 concentration from the reference instrument of the pilot plant. 3 IntroductionSO 2 is one of the major air pollutants because it is a precursor of acid rain, forms acid particulates, and is dangerous for human health. However, in a thermal power plant, SO 2 is generally produced when sulfur containing fuel is combusted. In flue gas cleaning processes, SO 2 is usually removed by absorption with lime (CaOH 2 .2H 2 O) or other compounds having high alkalinity. State-of-the-art desulphurization can remove more than 98% of the SO 2 from the flue gas. With increasing environmental concerns, the regulation of SO 2 emission from thermal power plants has become stricter. The installation of sensors in the flue gas duct has been proposed as one of the alternatives to improve the efficiency of the desulphurization un...

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“…4), the resistive type VWT SO 2 sensor has been reported to have a good response to SO 2 . However, it responded markedly to NO and NH 3 , which means the SO 2 sensor has a strong crosssensitivity to NO and NH 3 . This needs to be resolved.…”

Section: Introductionmentioning

confidence: 99%

“…To meet these conditions, Izu et al reported on a planar SO 2 sensor based on thick-films of V 2 O 5 /WO 3 /TiO 2 (abbreviated VWT), 3),4) since VWT shows a proven stability in sulfur oxide-rich combustion exhausts. 5) In Ref.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of a porous Pt/alumina cover layer for V2O5/WO3/TiO2 resistive SO2 sensing materials

Izu

Hagen

Schubert

et al. 2013

J. Ceram. Soc. Japan

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Planar resistive type SO 2 sensors based on V 2 O 5 /WO 3 /TiO 2 (VWT) have been reported to respond well to SO 2 but with large cross-effects of NO and NH 3 . In this study, we added a porous Pt/alumina cover layer on a VWT film in order to decrease the cross sensitivities. The sensor response to SO 2 is hardly affected by the Pt/alumina layer in the case of VWT sensor with 3.0 wt % V 2 O 5 with Au electrodes, while the Pt/alumina layer affects the response of other VWT sensors. The VWT sensor (3.0 wt % V 2 O 5 ) with Au electrodes with the porous Pt/alumina cover layer shows much smaller responses to CO, H 2 , H 2 O, NH 3 , and NO compared with the sensor without Pt/alumina cover layer. The porous Pt/alumina cover layer has a potential to improve the selectivity of the VWT sensor.

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Planar potentiometric SO2 gas sensor for high temperatures using NASICON electrolyte combined with V2O5/WO3/TiO2 + Au or Pt electrode

Cited by 23 publications

References 19 publications

New insight into the electrical properties and ion dynamics of screen printed NASICON thick films

New insight into the electrical properties and ion dynamics of screen printed NASICON thick films

SiC–FET based SO2 sensor for power plant emission applications

Effect of a porous Pt/alumina cover layer for V<sub>2</sub>O<sub>5</sub>/WO<sub>3</sub>/TiO<sub>2</sub> resistive SO<sub>2</sub> sensing materials

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