Novel Solid Electrolyte CO2 Gas Sensors Based on c-Axis-Oriented Y-Doped La9.66Si5.3B0.7O26.14

Ma, Nan; Ide, Shingo; Suematsu, Koichi; Watanabe, Ken; Shimanoe, Kengo

doi:10.1021/acsami.0c00454

Cited by 14 publications

(8 citation statements)

References 25 publications

(40 reference statements)

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“…For a wider contact area, the use of a gold mesh has also been proposed [ 216 ]. The solid electrolyte consists more often than not in NASICON, but potassium carbonate (K

) [ 209 ], Na-beta-alumina [ 218 ], lithium phosphate (Li

) [ 213 , 214 , 215 ], and more recently Yttrium-doped LSBO (La

) [ 219 ] and Li

[ 220 ] have also been used with some success. As for the coating of the sensing electrode, various carbonates were explored such as Na

, Li

or CaCO

, with similar performance.…”

Section: Review Of Co Sensing Techniquesmentioning

confidence: 99%

Carbon Dioxide Sensing—Biomedical Applications to Human Subjects

Dervieux¹,

Théron

Uhring

2021

Sensors

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Carbon dioxide (CO2) monitoring in human subjects is of crucial importance in medical practice. Transcutaneous monitors based on the Stow-Severinghaus electrode make a good alternative to the painful and risky arterial “blood gases” sampling. Yet, such monitors are not only expensive, but also bulky and continuously drifting, requiring frequent recalibrations by trained medical staff. Aiming at finding alternatives, the full panel of CO2 measurement techniques is thoroughly reviewed. The physicochemical working principle of each sensing technique is given, as well as some typical merit criteria, advantages, and drawbacks. An overview of the main CO2 monitoring methods and sites routinely used in clinical practice is also provided, revealing their constraints and specificities. The reviewed CO2 sensing techniques are then evaluated in view of the latter clinical constraints and transcutaneous sensing coupled to a dye-based fluorescence CO2 sensing seems to offer the best potential for the development of a future non-invasive clinical CO2 monitor.

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“…For a wider contact area, the use of a gold mesh has also been proposed [ 216 ]. The solid electrolyte consists more often than not in NASICON, but potassium carbonate (K

) [ 209 ], Na-beta-alumina [ 218 ], lithium phosphate (Li

) [ 213 , 214 , 215 ], and more recently Yttrium-doped LSBO (La

) [ 219 ] and Li

[ 220 ] have also been used with some success. As for the coating of the sensing electrode, various carbonates were explored such as Na

, Li

or CaCO

, with similar performance.…”

Section: Review Of Co Sensing Techniquesmentioning

confidence: 99%

Carbon Dioxide Sensing—Biomedical Applications to Human Subjects

Dervieux¹,

Théron

Uhring

2021

Sensors

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Section: Resultsmentioning

confidence: 99%

Widening the Range of Trackable Environmental and Health Pollutants for Li-Garnet-Based Sensors

Balaish¹,

Rupp²

2021

Meet. Abstr.

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Classic chemical sensors integrated in phones, vehicles, and industrial plants monitor the levels of humidity or carbonaceous/oxygen species to track environmental changes. Current projections for the next two decades indicate the strong need to increase the ability of sensors to sense a wider range of chemicals for future electronics not only to continue monitoring environmental changes but also to ensure the health and safety of humans. To achieve this goal, more chemical sensing principles and hardware must be developed. Here, we provide a proof-of-principle for the specific electrochemistry, material selection, and design of a Li-garnet Li 7 La 3 Zr 2 O 12 (LLZO)-based electrochemical sensor, targeting the highly corrosive environmental pollutant sulfur dioxide (SO 2 ). This work extends the prime use of LLZO as a battery component as well as the range of so far trackable pollutants for potential future sensor-noses. Novel composite sensing electrode designs using LLZO based on porous scaffold, employed to define a high number of reaction sites, allowed to successfully track SO 2 at the dangerous levels of 0-10 ppm with close-to-theoretical SO 2 sensitivity. The insights on the sensing electrochemistry, reactions involved and control over the interface sensing electrode/Li + electrolyte structures and phase stability provide first guidelines for future Ligarnet sensors to monitor with fast response a wider range of environmental pollutants and toxins.

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“…This is in contrast to type III potentiometric electrochemical sensors, where the sensing electrode and solid electrolyte are based on different mobile ions (e.g., Li + conductor and O 2− conductor for Li 2 SO 4 |MSZ), [36] necessitating the formation of a mediating phase (ionic bridge) to provide a fast and stable electrochemical response by delivering a continuous path for ion conduction. [66][67][68] Nonetheless, the formation of an interfacial layer at the sensing electrode/ solid electrolyte interface provided by interdiffusion and chemical reactivity, accelerated during heat treatment during the sensing electrode coating process (750 °C) or operation of the sensor (480 °C), may occur and deteriorate the SO 2 sensing ability while establishing a complex voltage response due to competitive electrochemical reaction. Moreover, close inspection of the cross-sectional SEM images and elemental mapping of a sensor after a prolonged sensing experiment (Figure S7, Supporting Information) reveals an ≈1-2 µm-thick Ca-rich layer sandwiched between the LLZO solid electrolyte and auxiliary sensing electrode.…”

Section: Proof-of-principle For Li-garnet-based So 2 Sensorsmentioning

confidence: 99%

Widening the Range of Trackable Environmental and Health Pollutants for Li‐Garnet‐Based Sensors

Balaish

Rupp

2021

Advanced Materials

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States, these contributors have led to an increased occurrence of natural disasters such as wild fires and hurricanes, which will continue to result in vast environmental climate-change-driven migration and resettling. As a consequence, disparities in terms of quality of life for humans will become much larger, demanding an affordable infrastructure that can locally measure changes in air pollution and minimize climate-change-induced socioeconomic conflicts. Shifts in the local temperature, humidity, and pollutant levels can lead to new diseases and their spread, which in turn requires a careful understanding and measurement of the interplay between these processes. With roughly 91% of the world's population living in urban areas breathing polluted air, [1] solid-state sensors at relatively low cost for the monitoring and control of environmental quality are imperative to preserve air quality, human health, and the environment. In this context, sulfur oxides, SO 2 and SO 3 , make up a sizeable portion of harmful pollutants, which are emitted from residential, manufacturing, and construction sectors through the combustion of sulfur-containing compounds in fossil fuels during oil and gas production and from natural processes such as volcanic eruptions and forest fires (Figure 1a). [4] Sulfur oxides may interact with the environment to cause toxicity, diseases, and environmental decay, playing a significant role in acid rain and having an adverse impact on forests, water, soil, corrosion, and human health (Figure 1b). [5][6][7][8] Moreover, considerable evidence indicates a link between SO 2 exposure and risk of missed abortion in the first trimester of pregnancy, alongside higher likelihood of stillbirth and birth defects due to maternal longterm exposure to pollutants. [9,10] The permissible exposure limit to SO 2 in the air and workplaces is 0.1-10 and 5 ppm, respectively, setting the upper limit for exposure without detrimental effects. [11,12] Conventionally, SO 2 concentrations are measured using one of two optical tracking technologies, IR spectroscopy, or UV absorbance spectroscopy, which are accurate and stable but rather expensive and dependent on bulky instruments (≈50 000 cm 3 ) and thus not suitable for real-time continuous monitoring required in miniaturized applications (Figure 1c). Alternative detection methods include gas chromatography and flame emission spectrometry, which are expensive, time consuming, and demand high power and are thus impractical for real-time monitoring and feedback control on a daily basis. [11,13] Classic chemical sensors integrated in phones, vehicles, and industrial plants monitor the levels of humidity or carbonaceous/oxygen species to track environmental changes. Current projections for the next two decades indicate the strong need to increase the ability of sensors to sense a wider range of chemicals for future electronics not only to continue monitoring environmental changes but also to ensure the health and safety of humans. To achieve this goal, more chemical sensing...

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Novel Solid Electrolyte CO₂ Gas Sensors Based on c-Axis-Oriented Y-Doped La_9.66Si_5.3B_0.7O_26.14

Cited by 14 publications

References 25 publications

Carbon Dioxide Sensing—Biomedical Applications to Human Subjects

Carbon Dioxide Sensing—Biomedical Applications to Human Subjects

Widening the Range of Trackable Environmental and Health Pollutants for Li-Garnet-Based Sensors

Widening the Range of Trackable Environmental and Health Pollutants for Li‐Garnet‐Based Sensors

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