Mesoporous tungsten oxide electrodes for YSZ-based mixed potential sensors to detect NO2 in the sub ppm-range

Zheng, Xiaohong; Zhang, Cheng; Xia, Jinfeng; Zhou, Guohong; Jiang, Danyu; Wang, Shiwei; Li, Xin; Shen, Yibo; Dai, Mengting; Wang, Bing

doi:10.1016/j.snb.2019.01.016

Cited by 25 publications

(11 citation statements)

References 32 publications

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“…A mesoporous WO 3 catalyst was prepared via nanoreplication using SBA-15 as a template and silicotungstic acid as a precursor, as described in previous reports [44][45][46] and in Supporting Information (Fig. 1).…”

Section: Methodsmentioning

confidence: 99%

Mesoporous tungsten trioxide for highly sensitive and selective detection of ammonia

Zhang

Zheng

et al. 2020

J Mater Sci

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The sensing performance of a mixed-potential NH 3 sensor is dependent on the microstructure of its electrode, which can be optimized to enhance the adsorption and diffusion of target gases. Mesoporous tungsten trioxide was prepared using an effective hard template method and applied as a sensitive electrode in a yttria-stabilized zirconia electrolyte-based mixed-potential NH 3 gas sensor. The NH 3 detection of the sensor was investigated in a temperature range of 250-650 °C. The sensor exhibited a much better NH 3 sensing performance than another sensor based on commercial bulk WO 3 under the same conditions. Furthermore, the NH 3 sensor based on mesoporous WO 3 exhibited a logarithmic response to the NH 3 concentration (30-250 ppm). To investigate this response, the specialized microstructure of mesoporous WO 3 was observed by transmission electron microscopy. Specifically, the high surface area and welldefined mesopores of the material significantly contributed to the excellent sensing performance. This report provides the first demonstration of the excellent response and sensitivity of an NH 3 sensor based on mesoporous WO 3 at low temperatures (250-400 °C).

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Section: Methodsmentioning

confidence: 99%

Mesoporous tungsten trioxide for highly sensitive and selective detection of ammonia

Zhang

Zheng

et al. 2020

J Mater Sci

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“…At first, metals such as Au, Pt, and Mo or binary systems with Ag, Au, Ni, and Cu based on Pt were mainly employed [15]. However, recent investigations proposed materials based on NiO, WO 3 [43], ZnO, and ZnO/CuO [15,44].…”

Section: Electrodesmentioning

confidence: 99%

“…The decomposition of water occurs at the inner electrodes according to reactions (43)-( 46) until a pure nitrogen atmosphere is formed in the inner chamber, as presented in Figure 8D(a,b). Reaction (43) occurs at the YSZ's inner electrode: (43) and reaction (44) occurs at the LSY's inner electrode:…”

Section: Humidity (H 2 O Steam) Sensorsmentioning

confidence: 99%

Fundamentals and Principles of Solid-State Electrochemical Sensors for High Temperature Gas Detection

et al. 2021

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The rapid development of science, technology, and engineering in the 21st century has offered a remarkable rise in our living standards. However, at the same time, serious environmental issues have emerged, such as acid rain and the greenhouse effect, which are associated with the ever-increasing need for energy consumption, 85% of which comes from fossil fuels combustion. From this combustion process, except for energy, the main greenhouse gases-carbon dioxide and steam-are produced. Moreover, during industrial processes, many hazardous gases are emitted. For this reason, gas-detecting devices, such as electrochemical gas sensors able to analyze the composition of a target atmosphere in real time, are important for further improving our living quality. Such devices can help address environmental issues and inform us about the presence of dangerous gases. Furthermore, as non-renewable energy sources run out, there is a need for energy saving. By analyzing the composition of combustion emissions of automobiles or industries, combustion processes can be optimized. This review deals with electrochemical gas sensors based on solid oxide electrolytes, which are employed for the detection of hazardous gasses at high temperatures and aggressive environments. The fundamentals, the principle of operation, and the configuration of potentiometric, amperometric, combined (amperometric-potentiometric), and mixed-potential gas sensors are presented. Moreover, the results of previous studies on carbon oxides (COx), nitrogen oxides (NOx), hydrogen (H2), oxygen (O2), ammonia (NH3), and humidity (steam) electrochemical sensors are reported and discussed. Emphasis is given to sensors based on oxygen ion and proton-conducting electrolytes.

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“…To this end, one of the remaining key challenges is the required detection limit for NO 2 in the low parts-per-billion (ppb) range and in the presence of potentially interfering molecular species abundant in urban air, such as O 2 , CO 2 , CO, and H 2 O. Therefore, significant research has been invested in developing NO 2 -sensing platforms comprising different materials and utilizing different readout principles, as summarized in recent reviews. , Among the NO 2 -sensitive materials, metal oxides, in general, and tungsten trioxide (WO 3 ), in particular, have been identified as highly NO 2 -selective and have therefore been explored in a plethora of designs, ranging from thin films to colloidal nanoparticles. − Among a large number of sensor readout principles, resistive metal-oxide-semiconductor (MOS-type) sensors , and electrochemical sensors , are to date considered the best compromise in terms of technology maturity, sensitivity, cost, and device miniaturization potential. However, the performance of MOS-type sensors is limited by their long response time and signal drift, whereas electrochemical sensors are limited by cross-sensitivity and susceptibility toward changes in the humidity level and temperature .…”

mentioning

confidence: 99%

“…A 15 nm thick chromium film was deposited by e-beam physical vapor deposition (Lesker PVD 225, base pressure of 5 × 10 −7 Torr, deposition rate of 1 Å/s) (7). The PS spheres were removed from the surface by tapestripping (SWT-10 tape, Nitto Scandinavia AB) to reveal holes in the Cr film at the positions of spheres (8). To complete the hole-mask pattern, the surface was exposed to oxygen plasma (Plasma-Therm Batchtop RIE 95 m, 50 W, 250 mTorr, 10 sccm) for 3 min to etch the PMMA layer through the holes in the Cr film.…”

mentioning

confidence: 99%

Nanoplasmonic NO₂ Sensor with a Sub-10 Parts per Billion Limit of Detection in Urban Air

et al. 2022

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Urban air pollution is a critical health problem in cities all around the world. Therefore, spatially highly resolved real-time monitoring of airborne pollutants, in general, and of nitrogen dioxide, NO 2 , in particular, is of utmost importance. However, highly accurate but fixed and bulky measurement stations or satellites are used for this purpose to date. This defines a need for miniaturized NO 2 sensor solutions with detection limits in the low parts per billion range to finally enable indicative air quality monitoring at low cost that facilitates detection of highly local emission peaks and enables the implementation of direct local actions like traffic control, to immediately reduce local emissions. To address this challenge, we present a nanoplasmonic NO 2 sensor based on arrays of Au nanoparticles coated with a thin layer of polycrystalline WO 3 , which displays a spectral redshift in the localized surface plasmon resonance in response to NO 2 . Sensor performance is characterized under (i) idealized laboratory conditions, (ii) conditions simulating humid urban air, and (iii) an outdoor field test in a miniaturized device benchmarked against a commercial NO 2 sensor approved according to European and American standards. The limit of detection of the plasmonic solution is below 10 ppb in all conditions. The observed plasmonic response is attributed to a combination of charge transfer between the WO 3 layer and the plasmonic Au nanoparticles, WO 3 layer volume expansion, and changes in WO 3 permittivity. The obtained results highlight the viability of nanoplasmonic gas sensors, in general, and their potential for practical application in indicative urban air monitoring, in particular.

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Mesoporous tungsten oxide electrodes for YSZ-based mixed potential sensors to detect NO2 in the sub ppm-range

Cited by 25 publications

References 32 publications

Mesoporous tungsten trioxide for highly sensitive and selective detection of ammonia

Mesoporous tungsten trioxide for highly sensitive and selective detection of ammonia

Fundamentals and Principles of Solid-State Electrochemical Sensors for High Temperature Gas Detection

Nanoplasmonic NO₂ Sensor with a Sub-10 Parts per Billion Limit of Detection in Urban Air

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Mesoporous tungsten oxide electrodes for YSZ-based mixed potential sensors to detect NO2 in the sub ppm-range

Cited by 25 publications

References 32 publications

Mesoporous tungsten trioxide for highly sensitive and selective detection of ammonia

Mesoporous tungsten trioxide for highly sensitive and selective detection of ammonia

Fundamentals and Principles of Solid-State Electrochemical Sensors for High Temperature Gas Detection

Nanoplasmonic NO2 Sensor with a Sub-10 Parts per Billion Limit of Detection in Urban Air

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Product

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Nanoplasmonic NO₂ Sensor with a Sub-10 Parts per Billion Limit of Detection in Urban Air