Sensing properties of amperometric ppb-level NO2 sensor based on sodium ion conductor with sensing electrodes comprising different WO3 nanostructures

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

doi:10.1007/s10853-018-03189-7

Cited by 12 publications

(3 citation statements)

References 41 publications

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“…These results imply that the La-Co 3 O 4 sensor would exhibit a higher gas response compared to the N-Co 3 O 4 sensor owing to its higher specific surface area that would increase the number of active sites on the surface, and its mesoporous structure that would be conducive for the rapid diffusion of gas molecules. [37][38][39][40] The average particle sizes of La-Co 3 O 4 and N-Co 3 O 4 were calculated from the XRD data via the Scherrer equation, and it was found that the average particle size of La-Co 3 O 4 was (10.3 nm) significantly smaller than that of N-Co 3 O 4 (12.6 nm), as shown in Table I.…”

Section: Resultsmentioning

confidence: 99%

LaF₃ Doped Co₃O₄ Mesoporous Nanomaterials with Hierarchical Structure for Enhanced Triethylamine Gas Sensing Performances

Jiang¹,

Guo²,

Jia³

et al. 2021

J. Electrochem. Soc.

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In this study, sea-urchin-like LaF3 doped mesoporous Co3O4 (La-Co3O4) nanomaterials were obtained by the heat treatment of citric acid-assisted hydrothermally-synthesized products at 300 °C. The composition, microstructure, and morphology were investigated by different characterization methods. Structural analyses reveal that La-Co3O4 has a hierarchical structure formed by the assembly of numerous nanorods that are aggregated by countless nanosheets. We probed the sensing ability of the La-Co3O4 based sensors toward a series of volatile organic gases, such as triethylamine, xylene, and ethanol. The results indicate that the sensors exhibited excellent selectivity and responsiveness toward triethylamine, with a lower detection limit of 1.0 ppm and long-term stability at an operating temperature of 195 °C. The prominent gas sensing performance first originates from the high content of adsorbed oxygen for doping LaF3 in which the high mobility of F anions resulted in the presence of F vacancies on the surface of the composites. Additionally, the abundant porosity offered by the hierarchical structure is favorable to the adsorption of oxygen species, surface reactions, and gas diffusion during the sensing process. Doping LaF3 to the semiconductor materials may provide a potential approach for the development of novel gas sensing materials.

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Section: Resultsmentioning

confidence: 99%

LaF₃ Doped Co₃O₄ Mesoporous Nanomaterials with Hierarchical Structure for Enhanced Triethylamine Gas Sensing Performances

Jiang¹,

Guo²,

Jia³

et al. 2021

J. Electrochem. Soc.

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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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“…Applications involving sodium ion conduction are increasingly considered. For instance, due to high abundance of sodium in the Earth crust and low cost electrode, including WO 3 , sodium ion batteries (SIB) are under development [2,3] whereas e-nose detection popularizes Na + superionic conductor (NA-SICON) as a solid electrolyte in contact with WO 3 , among other sensing layers [4,5]. Besides application in EC devices [6], these tungsten trioxide thin films embrace manifold applications e.g.…”

Section: Introductionmentioning

confidence: 99%

Towards enhanced durability of electrochromic WO3 interfaced with liquid or ceramic sodium-based electrolytes

Zimmer

Tresse

Stein

et al. 2020

Electrochimica Acta

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The reversible intercalation of sodium ion into tungsten oxide WO 3 appears as an interesting alternative to hydrogen or lithium ion reduction in order to get the characteristic transition from clear transparent to bluish coloration in electrochromic devices, but it has been comparatively less considered. In order to address further viable all-ceramic devices based on sodium ion intercalation and overcome the issue of WO 3 degradation in aqueous media, three configurations of WO 3 thin film-based electrochromic half-cells were tested, namely in (i) aqueous acidified Na 2 SO 4 electrolyte, (ii) room temperature ionic liquid BEPipTFSI electrolyte and (iii) aqueous acidified Na 2 SO 4 electrolyte associated with an amorphous NASICON-cap onto WO 3 film. We compared their electro-optical characteristics during 100 voltammetry cycles, including the Na + diffusion coefficient calculated through electrochemical method. It is found that sputter-deposited amorphous WO 3 thin films on transparent conductive substrates is promising for electrochromic all-ceramic devices based on Na ion insertion. Electrochemical characterization in aqueous medium is not relevant to extract relevant data when WO 3 is in direct contact with the electrolyte as the electrochromic film is progressively dissolved. In contrast, WO 3 capped with oxide amorphous Na-ion conductor readily operates over 100 cycles, the capping layer preventing degradation by the aqueous medium. Alternatively, ionic liquid does not degrade the WO 3 film and can be employed to efficiently characterize the electro-optical performances.

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Sensing properties of amperometric ppb-level NO2 sensor based on sodium ion conductor with sensing electrodes comprising different WO3 nanostructures

Cited by 12 publications

References 41 publications

LaF₃ Doped Co₃O₄ Mesoporous Nanomaterials with Hierarchical Structure for Enhanced Triethylamine Gas Sensing Performances

LaF₃ Doped Co₃O₄ Mesoporous Nanomaterials with Hierarchical Structure for Enhanced Triethylamine Gas Sensing Performances

Mesoporous tungsten trioxide for highly sensitive and selective detection of ammonia

Towards enhanced durability of electrochromic WO3 interfaced with liquid or ceramic sodium-based electrolytes

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Sensing properties of amperometric ppb-level NO2 sensor based on sodium ion conductor with sensing electrodes comprising different WO3 nanostructures

Cited by 12 publications

References 41 publications

LaF3 Doped Co3O4 Mesoporous Nanomaterials with Hierarchical Structure for Enhanced Triethylamine Gas Sensing Performances

LaF3 Doped Co3O4 Mesoporous Nanomaterials with Hierarchical Structure for Enhanced Triethylamine Gas Sensing Performances

Mesoporous tungsten trioxide for highly sensitive and selective detection of ammonia

Towards enhanced durability of electrochromic WO3 interfaced with liquid or ceramic sodium-based electrolytes

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Product

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LaF₃ Doped Co₃O₄ Mesoporous Nanomaterials with Hierarchical Structure for Enhanced Triethylamine Gas Sensing Performances

LaF₃ Doped Co₃O₄ Mesoporous Nanomaterials with Hierarchical Structure for Enhanced Triethylamine Gas Sensing Performances