The Experts below are selected from a list of 6822 Experts worldwide ranked by ideXlab platform
Norio Miura - One of the best experts on this subject based on the ideXlab platform.
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Impedancemetric YSZ-based oxygen sensor using BaFeO3 Sensing-Electrode
Sensors and Actuators B-chemical, 2017Co-Authors: Hiroshi Ikeda, Sri Ayu Anggraini, Norio MiuraAbstract:Abstract This paper deals with an impedancemetric sensor based on an yttria-stabilized zirconia (YSZ) using an oxide Sensing-Electrode (SE) for measuring O 2 concentration. Fourteen oxides were examined as the SE materials for selective detection of O 2 . Among the sensors examined, the YSZ-based sensor using BaFeO 3 -SE was found to be insensitive to interfering gases such as NH 3 , H 2 , C 3 H 6 , C 3 H 8 , CH 4 , NO 2 , NO or CO, while sensitive to only O 2 at 600 °C. The impedance value |Z| at 10 Hz for the sensor using BaFeO 3 -SE decreased linearly with increasing O 2 concentration on a logarithmic scale in the range of 0.05–21 vol.%. The present sensor exhibited quick and repeatable responses to the change in O 2 concentration.
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Novel zirconia-based NO2 sensor attached with carbon Sensing-Electrode
Electrochemistry Communications, 2014Co-Authors: Tomoaki Sato, Hiroshi Ikeda, Norio MiuraAbstract:Abstract Yttria-stabilized zirconia (YSZ)-based gas sensors using each of various carbons as a new Sensing-Electrode (SE) material were fabricated and their Sensing characteristics to nitrogen oxides (NOx, NO and NO 2 ) were evaluated. Among the four carbon-SEs tested, the activated-carbon SE was found to give a high sensitivity and a relatively high selectivity to NO 2 at an operational temperature of 300 °C. The high NO 2 sensitivity/selectivity of the sensor was confirmed to be due to a much higher electrochemical catalytic-activity to NO 2 than those to other gases (NO and C 3 H 6 ).
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no2 Sensing performances of planar sensor using stabilized zirconia and thin nio Sensing Electrode
Sensors and Actuators B-chemical, 2008Co-Authors: Vladimir V Plashnitsa, Perumal Elumalai, Taro Ueda, Norio MiuraAbstract:Abstract The nano-structured thin NiO films were prepared by r.f. magnetron sputtering of pure nickel on an yttria-stabilized zirconia (YSZ) substrate, followed by oxidation and final sintering at different temperatures of 1000–1200 °C (1 h). The scanning electron microscope (SEM) observation showed that the thickness as well as the morphology of the thin NiO films depended greatly on the sputtering time and the sintering temperature. The thin NiO films formed having thicknesses of 30–180 nm were examined as a Sensing Electrode (SE) for the mixed potential-type planar YSZ-based NO 2 sensor operating at 600–800 °C. The sensitivity of the sensors using the thin NiO-SEs was found to be linear on a logarithm of NO 2 concentration in the range of 50–400 ppm and 120-nm thick NiO-SE sintered at 1100 °C gave the highest NO 2 sensitivity as well as very fast response/recovery at operating temperatures below 800 °C. Also, the fabricated NO 2 sensor using nano-thick NiO-SE showed much higher NO 2 sensitivity under exposing to the wet sample gas containing 5 vol.% water vapor than that under dry condition. This seems to be attributed to the high catalytic activity to the electrochemical reaction of NO 2 at the interface between SE and YSZ. In addition, the sensor using the thin NiO-SE exhibited always higher NO 2 sensitivity than that attached with thick NiO-SE fabricated by screen-printing technique.
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high temperature operating characteristics of mixed potential type no2 sensor based on stabilized zirconia tube and nio Sensing Electrode
Sensors and Actuators B-chemical, 2006Co-Authors: Norio Miura, Mitsunobu Nakatou, Serge Zhuiykov, Perumal Elumalai, Jian Wang, Masaharu HaseiAbstract:Abstract This paper focuses on the gas Sensing properties of the mixed-potential-type yttria stabilized zirconia (YSZ)-based NO2 sensor aiming at monitoring high-temperature car emission. The sensor device was fabricated by using an YSZ tube and a NiO Sensing Electrode (SE), and then its NO2 Sensing properties were investigated in the operating temperature range of 800–900 °C. The X-ray diffraction (XRD) patterns confirmed that the SE film containing the face-centered cubic NiO phase was thermally stable after the 1400 °C sintering. The scanning electron microscope (SEM) observations showed that the SE film sintered at 1400 °C was smooth and uniform with 3–5 μm sized NiO grains. The thickness of the SE film was about 33 μm. The emf output of the sensor increased linearly with an increase in NO2 concentration on a logarithmic scale at each temperature examined. Among the various single-oxide SEs tested here and reported to date, NiO provided the highest sensitivity to NO2 even at 850 °C. The present NO2 sensor using NiO-SE showed faster recovery rate in the wet sample gas containing 5 vol.% water vapor than that in a dry sample gas. The Δemf value to 400 ppm NO2 under the wet condition was as high as 75 mV at 850 °C, while the value under dry condition was 60 mV. The improvement effect of water vapor on the Sensing performances was examined by means of impedance and polarization techniques.
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performances of planar no2 sensor using stabilized zirconia and nio Sensing Electrode at high temperature
Solid State Ionics, 2005Co-Authors: Perumal Elumalai, Norio MiuraAbstract:Abstract A planar NO 2 sensor was fabricated by using yttria-stabilized zirconia (YSZ) and NiO Sensing Electrode (SE). The NO 2 Sensing characteristics of the sensor were examined for emission control applications at elevated temperatures. The planar sensor employing the 1300 °C-sintered NiO-SE could detect NO 2 selectively even at 900 °C under wet condition, with acceptable NO 2 sensitivity as well as response/recovery rates. The emf output of the sensor varied linearly with NO 2 concentrations on a logarithmic scale in the range of 50–400 ppm. The Sensing mechanism based on mixed potential for the present sensor was verified by means of polarization measurements.
Geyu Lu - One of the best experts on this subject based on the ideXlab platform.
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CeO2-based mixed potential type acetone sensor using MFeO3 (M: Bi, La and Sm) Sensing Electrode
Sensors and Actuators B-chemical, 2018Co-Authors: Yueying Zhang, Xue Yang, Xishuang Liang, Jinhua Ouyang, Geyu LuAbstract:Abstract In order to obtain high-performance CeO2-based mixed potential type acetone sensors, MFeO3 (M: Bi, La and Sm) Sensing Electrode materials were prepared by sol-gel method. The present study mainly focused on the effect of Sensing Electrode material and sintering temperature on Sensing performance of sensors. The results showed that the sensor used BiFeO3-SE sintered at 800 °C presented the best Sensing characteristic to acetone at 600 °C, which can detect even 1 ppm acetone with an acceptable response value. The response value (ΔV) of the sensor changed proportionally with the logarithm of acetone concentration at the ranges of 1–5 ppm and 5–200 ppm, and the slopes of which were −7 and −75 mV/decade, respectively. The sensor also showed excellent repeatability, relatively good selectivity, resistance to humidity and good long-term stability. The high-Sensing characteristics of the sensor attached with BiFeO3-SE sintered at 800 °C to acetone were explained in terms of morphology and electrocatalytic activity of Sensing Electrode, which are validated by SEM, BET, XPS, polarization curves and complex impedance.
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Sub-ppb SO2 gas sensor based on NASICON and LaxSm1-xFeO3 Sensing Electrode
Sensors and Actuators B-chemical, 2018Co-Authors: Ce Ma, Xue Yang, Xishuang Liang, Chunhua Yang, Geyu LuAbstract:Abstract A NASICON-based mixed-potential gas sensor utilizing the perovskite-type orthoferrite LaxSm1-xFeO3 (x = 0.2, 0.4, 0.5, 0.6, 0.8) Sensing Electrode (SE) was designed for SO2 detection. The research mainly put emphasis on the effect of different La3+ doping ratios in LaxSm1-xFeO3 on the Sensing characteristics, and the highest response value (-86.5 mV) to 1 ppm SO2 was observed for the sensor using La0.5Sm0.5FeO3-SE. The response value of the fabricated sensor displayed segmentally linear relationship with the logarithm of SO2 concentration in the ranges of 0.005-0.2 ppm and 0.2–5 ppm, and the slopes were −8 and −86 mV/decade, respectively. Otherwise, the low detection limit of the present sensor even could reach to 5 ppb with an accurate response value (-8.4 mV). Meanwhile, the sensor also showed good repeatability, long-term stability and selectivity toward other interfering gases. Furthermore, the electrochemical impendence curves indicated the reason that the sensor attached with La0.5Sm0.5FeO3-SE displayed the higher response values than the other sensors. The result indicated that differences of electrocatalytic activity was caused by diverse La3+ doping content in Sensing Electrode. The Sensing mechanism related to the mixed potential was demonstrated by the polarization curve.
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Research PaperMixed potential type sensor based on stabilized zirconia and Co1-xZnx Fe2O4 Sensing Electrode for detection of acetone
Sensors and Actuators B-chemical, 2018Co-Authors: Bin Wang, Xue Yang, Xishuang Liang, Ce Ma, Chunhua Yang, Geyu LuAbstract:A series of spinel oxides Co1-xZnxFe2O4 (x = 0, 0.3, 0.5, 0.7 and 1) prepared by a facile sol-gel method were used as Sensing Electrodes of mixed potential type yttria stabilized-zirconia (YSZ)-based gas sensor for detection of acetone. The present study mainly focused on the influence of different proportions of cobalt and zinc in Co1-xZnxFe2O4 −Sensing Electrode (SE) on the acetone Sensing properties for the sensor, and the results showed that when x = 0.5, the fabricated sensor exhibited a largest sensitivity of −63 mV/decade to 5–100 ppm acetone at 650 °C. The response signal of the present sensor to 50 ppm acetone was as large as −112 mV, and even could achieve low detection limit of 300 ppb at 650 °C, which had a faithful response at this concentration. In addition, the present device also displayed good reliability, good cross sensitivities in the presence of various interfering gases, slight sensitive effect to humidity and good stability over 40 days at 650 °C. Moreover, the polarization curve was measured to further demonstrate the mixed potential mechanism.
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High-temperature NO2 gas sensor based on stabilized zirconia and CoTa2O6 Sensing Electrode
Sensors and Actuators B-chemical, 2017Co-Authors: Bin Wang, Xue Yang, Xishuang Liang, Yehui Guan, Qingji Wang, Yue Wang, Geyu LuAbstract:Abstract A mixed-potential type NO2 sensor based on stabilized-zirconia (YSZ) solid electrolyte and novel trirutile CoTa2O6 Sensing Electrode (SE) prepared through the sol-gel method was developed at high temperature. The effect of CoTa2O6 Sensing Electrode material calcinated at different temperatures on NO2 Sensing property was mainly investigated and the device attached with CoTa2O6-SE sintered at 1000 °C gave the highest response of 93 mV to 100 ppm NO2 and fast response and recovery times at 650 °C. The response of the sensor utilizing CoTa2O6-SE annealed at 1000 °C displayed segmentally linear relationship to the logarithm of NO2 concentration in the ranges of 0.5–5 ppm and 5–500 ppm, which the sensitivities were 12 and 80 mV/decade, respectively. Meanwhile, the present fabricated device also showed good reproducibility, selectivity, long-term stability and slight effect of oxygen and moisture at 650 °C. Furthermore, the mixed potential Sensing mechanism proposed was discussed quantitatively and further verified by polarization curve measurement.
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stabilized zirconia based mixed potential type sensors utilizing mnnb2o6 Sensing Electrode for detection of low concentration so2
Sensors and Actuators B-chemical, 2017Co-Authors: Yinglin Wang, Xue Yang, Xishuang Liang, Bin Wang, Qingji Wang, Yue Wang, Xiaohong Chuai, Geyu LuAbstract:Abstract A compact stabilized zirconia-based planar-type solid state electrochemical gas sensor using columbite type MnNb 2 O 6 Sensing Electrode (SE) was designed and developed, aiming at monitoring low concentration of SO 2 at high temperature. Among the different Sensing Electrode materials calcinated at 800, 1000 and 1200 °C, the device utilizing MnNb 2 O 6 -SE sintered at 1000 °C displayed the highest response of −27 mV to 5 ppm SO 2 and the low detection limit of 50 ppb at 700 °C. A linear dependence of ΔV for the sensor attached with MnNb 2 O 6 -SE sintered at 1000 °C on the logarithm of SO 2 concentration in the range of 0.05–5 ppm at an operating temperature of 700 °C was achieved, which the sensitivity was −13 mV/decade. The present sensor showed fast response time of 37 s to 1 ppm SO 2 at 700 °C. Furthermore, the present device also displayed good continuous response and recovery, high temperature stability and selectivity toward various interfering gases at 700 °C. Additionally, the Sensing mechanism related to mixed potential was proposed and further demonstrated based on the measurement of polarization curve.
Serge Zhuiykov - One of the best experts on this subject based on the ideXlab platform.
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high temperature operating characteristics of mixed potential type no2 sensor based on stabilized zirconia tube and nio Sensing Electrode
Sensors and Actuators B-chemical, 2006Co-Authors: Norio Miura, Mitsunobu Nakatou, Serge Zhuiykov, Perumal Elumalai, Jian Wang, Masaharu HaseiAbstract:Abstract This paper focuses on the gas Sensing properties of the mixed-potential-type yttria stabilized zirconia (YSZ)-based NO2 sensor aiming at monitoring high-temperature car emission. The sensor device was fabricated by using an YSZ tube and a NiO Sensing Electrode (SE), and then its NO2 Sensing properties were investigated in the operating temperature range of 800–900 °C. The X-ray diffraction (XRD) patterns confirmed that the SE film containing the face-centered cubic NiO phase was thermally stable after the 1400 °C sintering. The scanning electron microscope (SEM) observations showed that the SE film sintered at 1400 °C was smooth and uniform with 3–5 μm sized NiO grains. The thickness of the SE film was about 33 μm. The emf output of the sensor increased linearly with an increase in NO2 concentration on a logarithmic scale at each temperature examined. Among the various single-oxide SEs tested here and reported to date, NiO provided the highest sensitivity to NO2 even at 850 °C. The present NO2 sensor using NiO-SE showed faster recovery rate in the wet sample gas containing 5 vol.% water vapor than that in a dry sample gas. The Δemf value to 400 ppm NO2 under the wet condition was as high as 75 mV at 850 °C, while the value under dry condition was 60 mV. The improvement effect of water vapor on the Sensing performances was examined by means of impedance and polarization techniques.
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Mixed-Potential-Type NOx Sensor Based on YSZ and Zinc Oxide Sensing Electrode
Ionics, 2004Co-Authors: Norio Miura, K. Akisada, J. Wang, Serge ZhuiykovAbstract:Electrochemical sensors using tubular yttria-stabilized zirconia (YSZ) and oxide Sensing Electrode (SE) were fabricated and examined for NOx detection at high temperatures. The mixed-potential-type NOx sensor using ZnO-SE gave the highest sensitivity to NOx among other single-type oxides tested as SEs in the temperature range of 600–700 °C. The response of the ZnO-attached device was a linear for the logarithm of NO2 (NO) concentrations from 40 to 450 ppm. The Sensing mechanism of the sensor was discussed on the basis of the gas adsorption-desorption behavior, the catalytic activity data, and electrochemical behavior for oxides examined.
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impedancemetric gas sensor based on zirconia solid electrolyte and oxide Sensing Electrode for detecting total nox at high temperature
Sensors and Actuators B-chemical, 2003Co-Authors: Norio Miura, Mitsunobu Nakatou, Serge ZhuiykovAbstract:Abstract A solid-state electrochemical NOx sensor was fabricated by using a closed-one-end yttria-stabilized zirconia (YSZ) tube, an oxide Sensing Electrode (SE) and a Pt counter Electrode (CE). The complex impedance of the device using each of several oxide SEs was measured in the frequency and the temperature ranges of 0.1 Hz to 100 kHz and 600–700 °C, respectively. In most cases, a large semicircular arc was observed in complex impedance spectra (Nyquist plots) in the lower frequency range examined in dry-air flow. Only in the case of the device using ZnCr2O3 SE, the semi-arc shrank to some extent upon exposure to NOx gas. The resistance value (Z′) at the intersection of the semi-arc with the real axis at lower frequencies (around 0.1 Hz) varied with concentration of both NO and NO2 in the sample gas. The impedance value at 1 Hz of the present device was found to vary almost linearly with the concentration of NO (or NO2) from 50 to 400 ppm. The 90% response and 90% recovery times were as short as less than few seconds at 700 °C. Furthermore, it is noted that the sensitivity of NO is almost equal to that of NO2. This indicates that the present device can detect the total NOx at higher temperatures.
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high temperature nox sensors using zirconia solid electrolyte and zinc family oxide Sensing Electrode
Solid State Ionics, 2002Co-Authors: Serge Zhuiykov, Noboru Yamazoe, Norio MiuraAbstract:Abstract Yttria-stabilized zirconia (YSZ) electrochemical sensors attached with the zinc-family oxide (ZnFe 2 O 4 and ZnCr 2 O 4 ) Sensing Electrode (SE) were fabricated and examined for NOx Sensing properties at high temperatures. These oxide-SE-attached devices gave a linear correlation between EMF and the logarithm of NO 2 (or NO) concentration from 50 to 436 ppm in the temperature range 600–700 °C. The sensor using the combination of ZnFe 2 O 4 and ZnCr 2 O 4 was found to give the highest sensitivity to NO 2 in air at 700 °C among the oxide-SEs tested and reported in the literatures to date. Furthermore, addition of Pt to ZnFe 2 O 4 was found to improve the Sensing characteristics towards quick response. It was confirmed that the Sensing performances to NO 2 were roughly related to those to O 2 for the devices tested here.
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impedance based total nox sensor using stabilized zirconia and zncr2o4 Sensing Electrode operating at high temperature
Electrochemistry Communications, 2002Co-Authors: Norio Miura, Mitsunobu Nakatou, Serge ZhuiykovAbstract:Abstract We report here a new-type zirconia-based sensor that can detect total NOx content at high temperatures such as 700 °C. A closed-one-end yttria-stabilized zirconia (YSZ) tube was used as a base sensor material. An oxide Sensing Electrode (SE) and a Pt counter Electrode (CE) were formed on the outer and inner surfaces of the YSZ tube, respectively. The complex impedance of the device using a ZnCr2O4-Sensing Electrode was measured with an impedance analyzer in the frequency and the temperature ranges 0.1 Hz–100 kHz and 600–700 °C, respectively. A large semicircular arc was observed in complex impedance plots (Cole–Cole plots) in the lower frequency range examined and it seemed to correspond to the electrolyte/Electrode interface. The impedance value at 1 Hz of the present device was found to vary almost linearly with the concentration of NO (or NO2) from 50 to 400 ppm in the sample gas at 600–700 °C. Furthermore, it is noted that the sensitivity of NO is almost equal to that of NO2. This means that the present device can detect the total NOx at higher temperatures.
Ling Wang - One of the best experts on this subject based on the ideXlab platform.
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Enhancing NH3 Sensing performance of mixed potential type sensors by chemical exsolution of Ag nanoparticle on AgNbO3 Sensing Electrode
Sensors and Actuators B-chemical, 2019Co-Authors: Xu Li, Zhangxing He, Wei Meng, Yuehua Li, Ling WangAbstract:Abstract Perovskite oxide based composites have been considered as promising Sensing materials due to their superior activity and stability. Herein, we for the first time report a perovskite-type Sensing Electrode AgNbO3 for solid electrolyte type NH3 sensor, which exhibits well Sensing performance to NH3. On this basis, a new strategy is developed for in-situ synthesis of nanoparticle supported AgNbO3 Sensing Electrode by exsolution process. Well-dispersed Ag nanoparticles are socketed on the surface of AgNbO3 after exsolution treatment at 400 °C. Compared with pristine AgNbO3, the decoration of Ag nanoparticles can further enhance the response signal (electric potential difference, ΔV) of the sensor accompanied by the improved sensitivity and detection limit. More importantly, anti-interference capability of the sensor toward NO and NO2 is effectively enhanced due to the improved adsorption and electro-catalytic activity of the materials. The Ag nanoparticles decorated AgNbO3 Sensing Electrode with the coordination of superior sensitivity, selectivity and stability can be as a promising Sensing Electrode candidate for NH3 sensors. In addition, this chemical exsolution process will provide new approach for fabrication of Sensing Electrode with high performance for gas sensors.
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Mixed-potential type NH3 sensor based on CoWO4-PdO Sensing Electrode prepared by self-demixing
Electrochimica Acta, 2019Co-Authors: Wiewei Meng, Zhangxing He, Yuehua Li, Ling Wang, Huizhu Zhou, Wei MengAbstract:Abstract CoWO4-PdO dual phase composites were successfully prepared by self-demixing of the precursor CoPdxWO4+x (x = 0, 2%, 5%, 10%) calcined at 800 °C and used as Sensing Electrodes for mixed-potential type NH3 sensors based on yttria stabilized-zirconia (YSZ) electrolyte. The materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Field-emission scanning electron microscopy (FESEM), respectively. NH3 response performance of the sensors to different concentrations of NH3 (20–300 ppm) was evaluated at 350–500 °C. It was found that the sensors attached with CoWO4-PdO Sensing Electrode are much more sensitive to NH3 than the CoWO4-based sensor. Among them, CoWO4-5%PdO based sensor gives the highest sensitivity (−76.8 mV/decade at 400 °C), the response signals (ΔV) of the sensor vary linearly with the logarithm of the NH3 concentrations in the range of 50–300 ppm at a given temperature. The sensor also exhibits well reproducibility, stability and long-term stability. Furthermore, compared with CoWO4-based sensor, the introduction of PdO in CoWO4 makes the interference of NO2 on the sensor significantly reduced from 100% to 50%, which is attributed to the fact that the second phase PdO depresses the adsorption of NO2.
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Mixed-potential type NH3 sensor based on La10Si5.5Al0.5O27 electrolyte and CuV2O6 Sensing Electrode
Sensors and Actuators B-chemical, 2019Co-Authors: Xu Li, Zhangxing He, Wei Meng, Yuehua Li, Ling WangAbstract:Abstract The Sensing performance of the mixed-potential type NH3 sensor mainly depends on the property of the Sensing Electrode. Herein, The CuV2O6 is synthesized by modified solid reaction and used as the Sensing Electrode for the mixed-potential type NH3 sensor based on La10Si5.5Al0.5O27 electrolyte. The influence of the Sensing Electrode sintering temperature on the responding performance of the sensor is investigated. The results show that the appropriate sintering temperature (600 °C) can both firmly integrate the CuV2O6 Sensing Electrode into La10Si5.5Al0.5O27 electrolyte and enhance the length of three phase boundaries comprised by NH3 / CuV2O6 Sensing Electrode / electrolyte. The sensor exhibits excellent Sensing performance in NH3 concentration range of 25-300 ppm at the relatively lower temperature of 350 °C compared to the common operating temperatures for the mixed-potential type sensor. Introducing Ag particles into the CuV2O6 Sensing Electrode can improve the sensor's anti-interference to NOx. It is found that the response signals of the sensor with pristine CuV2O6 Sensing Electrode to 100 ppm NH3 are decreased by 58% and 65%, when sample gas contains 150 ppm NO2 or NO. While the response signals of sensor based on CuV2O6/0.22 mg Ag Sensing Electrode are decreased by only 22% and 14% under the same conditions. The potentiodynamic measurement results indicate that the present sensors follow the mixed-potential mechanism.
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Impedancemetric NO2 sensor based on Pd doped perovskite oxide Sensing Electrode conjunction with phase angle response
Electrochimica Acta, 2018Co-Authors: Lichao Ma, Zhangxing He, Wei Meng, Yuehua Li, Ling WangAbstract:Abstract A novel impedancemetric NO 2 sensor was developed using the Sensing Electrode of Pd doped perovskite oxide conjunction with phase angle ( Θ ) response. The La 0.8 Sr 0.2 Fe 0.95 Pd 0.05 O 3-δ particles with nanostructure were in-situ prepared in the porous skeleton of La 9.95 K 0.05 Si 6 O 26.95 bilayer electrolyte by the simple impregnation method. The Sensing performances of the NO 2 sensor were investigated with the total impedance value | Z | or Θ extracted from the impedance spectroscopy as the Sensing signal, respectively. The results shows that the Θ response can provide higher sensitivity, shorter response time and better stability compared to the | Z | response for the same sensor, especially at high frequency and temperature. Compared with the sensor with La 0.8 Sr 0.2 FeO 3-δ Sensing Electrode, the Pd doping in the Sensing Electrode makes the sensitivity of the sensor be effectively improved. The response signals depend on NO 2 concentrations from logarithmic relationship for La 0.8 Sr 0.2 FeO 3-δ Sensing Electrode to linear relationship for La 0.8 Sr 0.2 Fe 0.95 Pd 0.05 O 3-δ Sensing Electrode. Meanwhile, the sensor with LSFP-SE also exhibits the enhanced stability and anti-interference ability to various coexistence gases.
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Mixed-potential type NH3 sensor based on TiO2 Sensing Electrode with a phase transformation effect
Sensors and Actuators B-chemical, 2017Co-Authors: Weiwei Meng, Zhangxing He, Wei Meng, Yuehua Li, Huizhu Zhou, Ling WangAbstract:Abstract Mixed-potential type NH3 sensors were fabricated using La10Si5.5Al0.5O27 (LSAO) consisting of a porous layer and a dense layer as solid electrolyte and TiO2 as the Sensing Electrode. The effect of a LSAO porous layer and TiO2 phase transformation on sensor performances was investigated. The porous layer of LSAO electrolyte obviously enhanced sensor performance. Compared with the sensor without a LSAO porous layer, the sensor with LSAO porous layer exhibited larger responding potential values and higher sensitivity due to the enhanced three phase interface length. Anatase-TiO2 (a-TiO2) based sensor exhibited better Sensing performance than rutile-TiO2 (r-TiO2) based sensor at the examined temperature range. A-TiO2 transformation toward r-TiO2 resulted in poor Sensing performances of the sensor. The best Sensing characteristics were achieved for the NH3 sensor with a-TiO2 Sensing Electrode calcined at 900 °C for 3 h. The potential values of the sensor response to NH3 linearly depended on the logarithm of NH3 concentrations at 450–600 °C and the sensitivity reached 169.7 mV/decade in the range of 50–400 ppm at 500 °C. At the same time, the sensor exhibited well anti-interference capability to H2, NO, CH4 and CO2, but a little cross-sensitivity toward NO2 was observed. High temperature treatment (>900 °C) caused a-TiO2 transformation into r-TiO2 and V2O5 additions were conducive to TiO2 phase transformation.
Xishuang Liang - One of the best experts on this subject based on the ideXlab platform.
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Fuel cell type H2S sensor utilizing Pt-Sn-C/Nafion Sensing Electrode
Sensors and Actuators B-chemical, 2019Co-Authors: Xinyu Yang, Yueying Zhang, Weijia Li, Ri Zhou, Xishuang LiangAbstract:Abstract A Nafion-based amperometric sensor utilizing Pt-Sn/C Sensing Electrode was developed to realize the effective detection of H2S at room temperature. We compared the morphology and gas-Sensing properties of two kinds of Pt/C materials prepared by the sodium borohydride reduction method and the ethylene glycol method and found that the latter was significantly better. Pt-Sn/C prepared by the latter method has a uniform morphology and high catalytic activity and achieves efficient detection of H2S. The sensor could detect 0.2–100 ppm H2S linearly with a sensitivity of 0.276 μA/ppm. More importantly, the response-recovery time to 50 ppm H2S was 10 s and 8 s, which signified a very fast rate. Furthermore, the device also exhibited superior selectivity and long-term stability. Such a device has a good application prospect because of its many advantages.
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Acetone Sensing with a mixed potential sensor based on Ce0.8Gd0.2O1.95 solid electrolyte and Sr2MMoO6 (M: Fe, Mg, Ni) Sensing Electrode
Sensors and Actuators B-chemical, 2019Co-Authors: Weijia Li, Yueying Zhang, Yuxi Zhang, Xishuang LiangAbstract:Abstract In this study, Sr2MMoO6 (M: Fe, Mg and Ni) were prepared successfully by sol-gel method and used as Sensing Electrode materials for CeO2-based mixed potential type acetone sensors. Results indicated that the sensor attached with Sr2FeMoO6 Sensing Electrode exhibited the best Sensing characteristic to acetone among all the other sensors in this study, which showed the maximum response value of −147 mV to 100 ppm acetone at 590 °C and the typical 90% response time was about 13 s. The sensitivity of the sensor using Sr2FeMoO6-SE was the largest towards acetone at the range of 5–200 ppm, and the slope of which was −100 mV/decade. Moreover, the sensor could also detect 0.5 ppm acetone with an acceptable value. In addition, the device also exhibited excellent repeatability and humidity stability, good selectivity and stability during 25 days. Besides, the Sensing mechanism of the mixed potential type acetone sensor was explained clearly in this study.
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CeO2-based mixed potential type acetone sensor using MFeO3 (M: Bi, La and Sm) Sensing Electrode
Sensors and Actuators B-chemical, 2018Co-Authors: Yueying Zhang, Xue Yang, Xishuang Liang, Jinhua Ouyang, Geyu LuAbstract:Abstract In order to obtain high-performance CeO2-based mixed potential type acetone sensors, MFeO3 (M: Bi, La and Sm) Sensing Electrode materials were prepared by sol-gel method. The present study mainly focused on the effect of Sensing Electrode material and sintering temperature on Sensing performance of sensors. The results showed that the sensor used BiFeO3-SE sintered at 800 °C presented the best Sensing characteristic to acetone at 600 °C, which can detect even 1 ppm acetone with an acceptable response value. The response value (ΔV) of the sensor changed proportionally with the logarithm of acetone concentration at the ranges of 1–5 ppm and 5–200 ppm, and the slopes of which were −7 and −75 mV/decade, respectively. The sensor also showed excellent repeatability, relatively good selectivity, resistance to humidity and good long-term stability. The high-Sensing characteristics of the sensor attached with BiFeO3-SE sintered at 800 °C to acetone were explained in terms of morphology and electrocatalytic activity of Sensing Electrode, which are validated by SEM, BET, XPS, polarization curves and complex impedance.
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Sub-ppb SO2 gas sensor based on NASICON and LaxSm1-xFeO3 Sensing Electrode
Sensors and Actuators B-chemical, 2018Co-Authors: Ce Ma, Xue Yang, Xishuang Liang, Chunhua Yang, Geyu LuAbstract:Abstract A NASICON-based mixed-potential gas sensor utilizing the perovskite-type orthoferrite LaxSm1-xFeO3 (x = 0.2, 0.4, 0.5, 0.6, 0.8) Sensing Electrode (SE) was designed for SO2 detection. The research mainly put emphasis on the effect of different La3+ doping ratios in LaxSm1-xFeO3 on the Sensing characteristics, and the highest response value (-86.5 mV) to 1 ppm SO2 was observed for the sensor using La0.5Sm0.5FeO3-SE. The response value of the fabricated sensor displayed segmentally linear relationship with the logarithm of SO2 concentration in the ranges of 0.005-0.2 ppm and 0.2–5 ppm, and the slopes were −8 and −86 mV/decade, respectively. Otherwise, the low detection limit of the present sensor even could reach to 5 ppb with an accurate response value (-8.4 mV). Meanwhile, the sensor also showed good repeatability, long-term stability and selectivity toward other interfering gases. Furthermore, the electrochemical impendence curves indicated the reason that the sensor attached with La0.5Sm0.5FeO3-SE displayed the higher response values than the other sensors. The result indicated that differences of electrocatalytic activity was caused by diverse La3+ doping content in Sensing Electrode. The Sensing mechanism related to the mixed potential was demonstrated by the polarization curve.
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Research PaperMixed potential type sensor based on stabilized zirconia and Co1-xZnx Fe2O4 Sensing Electrode for detection of acetone
Sensors and Actuators B-chemical, 2018Co-Authors: Bin Wang, Xue Yang, Xishuang Liang, Ce Ma, Chunhua Yang, Geyu LuAbstract:A series of spinel oxides Co1-xZnxFe2O4 (x = 0, 0.3, 0.5, 0.7 and 1) prepared by a facile sol-gel method were used as Sensing Electrodes of mixed potential type yttria stabilized-zirconia (YSZ)-based gas sensor for detection of acetone. The present study mainly focused on the influence of different proportions of cobalt and zinc in Co1-xZnxFe2O4 −Sensing Electrode (SE) on the acetone Sensing properties for the sensor, and the results showed that when x = 0.5, the fabricated sensor exhibited a largest sensitivity of −63 mV/decade to 5–100 ppm acetone at 650 °C. The response signal of the present sensor to 50 ppm acetone was as large as −112 mV, and even could achieve low detection limit of 300 ppb at 650 °C, which had a faithful response at this concentration. In addition, the present device also displayed good reliability, good cross sensitivities in the presence of various interfering gases, slight sensitive effect to humidity and good stability over 40 days at 650 °C. Moreover, the polarization curve was measured to further demonstrate the mixed potential mechanism.
