Interface reaction and its effect on the performance of a CO2 gas sensor based on Li0.35La0.55TiO3 electrolyte and Li2CO3 sensing electrode

Yoon, Junro; Hunter, Gary W.; Akbar, Sheikh A.; Dutta, Prabir K.

doi:10.1016/j.snb.2013.02.104

Cited by 23 publications

(9 citation statements)

References 51 publications

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“…After sintering, the microstructural changes in grains with various sizes alter the activation energy of the bulk conductivity; in other words, the least amount of energy required for Li conduction inside the grains depends on the grain size [ 4 ]. In a phonon transport study, Xu et al [ 41 ] also reported that the intrinsic thermal conductivity is a function of grain size, and dominates the thermal conductivity of ZnO thin films [ 55 ]. Besides the structural changes inside the grains, the region of the space-charge layer (which blocks the ionic conduction) increases rapidly with reducing grain size, thus decreasing the grain boundary conductivities, especially when the grains and the space-charge layer regions are comparable in size [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

“…The final 17 descriptors applied in the machine learning were categorized into material, experimental, chemical and structural properties (see Figure 1). The additives (0: absent; 1: present), content of additives (wt%), sintering temperature (°C), sintering time (h), pellet diameter (mm), method type, grain size (μm) and phase type were collected along with the ionic conductivities from various published papers [8,[10][11][12]14,15,[30][31][32][33][34][35][36][37][38][39][40][41][42]. The method types were ball mill/ solid-state (0), melt quench (1), liquid phase (2), and sol-gel techniques (3).…”

Section: Descriptormentioning

confidence: 99%

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Essential structural and experimental descriptors for bulk and grain boundary conductivities of Li solid electrolytes

Tanaka

Komori

et al. 2020

Science and Technology of Advanced Materials

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We present a computational approach for identifying the important descriptors of the ionic conductivities of lithium solid electrolytes. Our approach discriminates the factors of both bulk and grain boundary conductivities, which have been rarely reported. The effects of the interrelated structural (e.g. grain size, phase), material (e.g. Li ratio), chemical (e.g. electronegativity, polarizability) and experimental (e.g. sintering temperature, synthesis method) properties on the bulk and grain boundary conductivities are investigated via machine learning. The data are trained using the bulk and grain boundary conductivities of Li solid conductors at room temperature. The important descriptors are elucidated by their feature importance and predictive performances, as determined by a nonlinear XGBoost algorithm: (i) the experimental descriptors of sintering conditions are significant for both bulk and grain boundary, (ii) the material descriptors of Li site occupancy and Li ratio are the prior descriptors for bulk, (iii) the density and unit cell volume are the prior structural descriptors while the polarizability and electronegativity are the prior chemical descriptors for grain boundary, (iv) the grain size provides physical insights such as the thermodynamic condition and should be considered for determining grain boundary conductance in solid polycrystalline ionic conductors.

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Section: Resultsmentioning

confidence: 99%

Section: Descriptormentioning

confidence: 99%

Essential structural and experimental descriptors for bulk and grain boundary conductivities of Li solid electrolytes

Tanaka

Komori

et al. 2020

Science and Technology of Advanced Materials

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“…From the Arrhenius plots E a values of LLTO lms grown at different oxygen partial pressures are estimated as 0.3-0.4 eV (Table 1), and the values are in agreement with the reported experimental values. 41 The high Li-ion conductivity of the order of 10 À3 S cm À1 at RT for LLTO oxide was suggested as its bulk property for the measurement of polycrystals (range of 10 À5 to 10 À4 S cm À1 ) aer extraction of grain boundaries' effect. 17 Direct measurement of the bulk conductivity was of interest to understand mechanism of diffusion/conductivity in LLTO.…”

Section: Resultsmentioning

confidence: 99%

Effect of oxygen pressure on structure and ionic conductivity of epitaxial Li_0.33La_0.55TiO₃ solid electrolyte thin films produced by pulsed laser deposition

et al. 2016

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“…One of the strategies to improve electrochemical sensors' attractiveness for applications in terms of low power consumption and fast response time would be to promote higher Li + mobility at TPBs and between the solid electrolyte and the auxiliary phase. There have been successful attempts of using very fast ceramic Li‐conductors, such as Li 3 x La ((2/3)− x ) □ ((1/3)−2 x ) TiO 3 (1 × 10 −3 S cm −1 ) for CO 2 tracking . Lithium lanthanum titanate based devices show however phase stability issues due to reduction of Ti.…”

Section: Literature Review Of the Type III Potentiometric Gas Sensorsmentioning

confidence: 99%

A Simple and Fast Electrochemical CO₂ Sensor Based on Li₇La₃Zr₂O₁₂ for Environmental Monitoring

et al. 2018

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arise to monitor local CO 2 concentration in order to improve energy efficiency and feedback loops on exhausts as data through small sensing devices. Gas sensors integrated as control units into buildings infrastructure, vehicles, smartphones, and wearable devices contribute to real-time georeferenced chemical tracking, working as well as the feedback units to educate consumers and industry. That would allow not only to monitor large-scale industrial CO 2 emission from power generation, food production, or packaging industries, [7] but also emission from nonindustrial buildings in order to improve energy efficiency of households and commercial areas. CO 2 monitoring is also essential for air-quality control of confined spaces such as office/ laboratory areas or marine vessels, where increased carbon dioxide concentration may not only influence laborers' well-being but also serves to assure their safety. Moreover, CO 2 tracking plays a major role in medical diagnosis for respiratory diseases and sleep disorder. [8,9] Nowadays popular CO 2 tracking devices are based on Fourier-transform infrared spectroscopy, showing very good accuracy (±30 ppm of CO 2 , ±2%), selectivity, and fast response times (<20 s.). [10] The nondispersive infrared CO 2 tracking devices are, however, limited by a narrow temperature operation window (0-50 °C), power consumption of around 40 mW for devices being operated in a pulsing mode rather than continuous and also show rather limited potential for further miniaturization due to optical configuration. [11,12] A promising alternative to those rather expensive devices lies in electrochemical potentiometric CO 2 sensors.In general, an electrochemical potentiometric gas sensor has a simple structure of an electrochemical cell, consisting of three functional components, namely, a sensing electrode, a solid-state electrolyte, and a reference electrode (RE). In such an arrangement, it is the selectivity of the electrode materials, which are used to detect gaseous species that is defining an electromotive force (EMF) of the cell, measured as a cell potential. Potential, as an intrinsic property, is independent on geometry or mass changes of the device, offering high scalability potential for future miniaturization. Here, the EMF manifested as voltage through the cell is related to the relative partial pressure of detected specimen at the electrodes as postulated by the Nernst equation. [13] Depending on the relation between gas and mobile specimen in the solid electrolyte, three types of potentiometric gas sensors can be distinguished, according to Weppner's classification [14] (Figure 1).In the goal of a sustainable energy future, either the energy efficiency of renewable energy sources is increased, day-to-day energy consumption by smart electronic feedback loops is managed in a more efficient way, or contribution to atmospheric CO 2 is reduced. By defining a next generation of fast-response electrochemical CO 2 sensors and materials, one can contribute to local monitoring of CO 2 flows from ind...

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Interface reaction and its effect on the performance of a CO2 gas sensor based on Li0.35La0.55TiO3 electrolyte and Li2CO3 sensing electrode

Cited by 23 publications

References 51 publications

Essential structural and experimental descriptors for bulk and grain boundary conductivities of Li solid electrolytes

Essential structural and experimental descriptors for bulk and grain boundary conductivities of Li solid electrolytes

Effect of oxygen pressure on structure and ionic conductivity of epitaxial Li_0.33La_0.55TiO₃ solid electrolyte thin films produced by pulsed laser deposition

A Simple and Fast Electrochemical CO₂ Sensor Based on Li₇La₃Zr₂O₁₂ for Environmental Monitoring

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Interface reaction and its effect on the performance of a CO2 gas sensor based on Li0.35La0.55TiO3 electrolyte and Li2CO3 sensing electrode

Cited by 23 publications

References 51 publications

Essential structural and experimental descriptors for bulk and grain boundary conductivities of Li solid electrolytes

Essential structural and experimental descriptors for bulk and grain boundary conductivities of Li solid electrolytes

Effect of oxygen pressure on structure and ionic conductivity of epitaxial Li0.33La0.55TiO3 solid electrolyte thin films produced by pulsed laser deposition

A Simple and Fast Electrochemical CO2 Sensor Based on Li7La3Zr2O12 for Environmental Monitoring

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Effect of oxygen pressure on structure and ionic conductivity of epitaxial Li_0.33La_0.55TiO₃ solid electrolyte thin films produced by pulsed laser deposition

A Simple and Fast Electrochemical CO₂ Sensor Based on Li₇La₃Zr₂O₁₂ for Environmental Monitoring