Effect of Li<sub>2</sub>O additions upon the crystal structure, sinterability and electrical properties of yttria stabilized zirconia electrolyte

Xiong, Jie; Jiao, Chengran; Han, Min−Koo; Yi, Wentao; Ma, Jie; Yan, Chunyan; Cai, Weiwei; Cheng, Hansong

doi:10.1039/c6ra24486f

Cited by 7 publications

(6 citation statements)

References 36 publications

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“…Showing some inhomogeneity in grain sizes due to higher sintering temperatures, but the most interesting is getting well compact and dense electrolyte materials compared to the other 2 compounds. Some pores started to occur, with higher Mg doping, abnormal grain growth resulted in some pores being trapped inside the microstructure even with higher sintering temperatures it is difficult to erase [50][51][52]. The EDX elemental analysis of CSZM was investigated, as shown in Figure 6 and Table 2 showing CSZM with the selected spectrum with the existence of all chemicals Ce, Sm, Zr, and Mg with a total percentage of 100% without any other impurities and proof of a full and complete solid-state reaction occurred for all compounds showing a pure fluorite type phase.…”

Section: Surface Morphology Of Synthesized Samples Using Sem and Edxmentioning

confidence: 99%

Structural, Thermal, and Electrochemical Properties of Ce 0.8−2x Sm 0.2 Zrx Mgx O2−d, {x = 0.05, 0.1 & 0.15} Promising Electrolyte Compounds for (IT-SOFCs) Applications

et al. 2023

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CSZM compounds were synthesized by dry chemistry route with 5, 10, and 15% dopant of Mg dopants in the Ce 0.8−2x Sm 0.2 Zrx Mgx O2−d, {x = 0.05, 0.1 & 0.15}. The newly investigated materials were physically, chemically, and electrochemically studied and have shown promising results. The CSZM was crystalized in a fluorite structure with a pure cubic phase in a space group Fm3m and cell parameter a = 5.401742 °A and theoretical density from 7.6 to 8.9 after firing in the air with a final temperature of 1400 °C. Characterization of the structure and indexing of electrolyte materials were made after X-ray diffraction (XRD) testing. A Scanning electron microscope (SEM) morphological analysis was used to examine the microstructure details. Electrochemical impedance spectroscopy (EIS) measurements were performed from 400 °C to 700 °C which show the highest conductivity value of 1.0461 × 10+1 S/cm at 700 °C. In comparison, the minimum value was 2.7329 × 10−2 S/cm at 400 °C, and the total activation energy (Ea°A) was found to be 0.6865 eV under 5% H2/Ar.

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Section: Surface Morphology Of Synthesized Samples Using Sem and Edxmentioning

confidence: 99%

Structural, Thermal, and Electrochemical Properties of Ce 0.8−2x Sm 0.2 Zrx Mgx O2−d, {x = 0.05, 0.1 & 0.15} Promising Electrolyte Compounds for (IT-SOFCs) Applications

et al. 2023

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“…This limited the relative density even at higher sintering temperatures [17]. However, the densification of the BSDC electrolyte system can be enhanced by prolonging the sintering time to control the abnormal grain growth and by introducing sintering aids [17][18][19].…”

Section: Densification and Microstructurementioning

confidence: 99%

Effect of sintering temperature on the microstructure and ionic conductivity of Ce0.8Sm0.1Ba0.1O2-δ electrolyte

Anwar¹,

Ali²,

Abdalla³

et al. 2017

PAC

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This study investigated the effects of sintering temperature on the microstructure and ionic conductivity of codoped ceria electrolyte with barium and samarium as dopants. The electrolyte (Ce 0.8 Sm 0.1 Ba 0.1 O 2-δ) powder was synthesized using the citric acid-nitrate combustion method and calcined at 900°C for 5 h. The calcined electrolyte exhibited a cubic fluorite crystal structure with some impurity phases. The calcined powder was then pressed into cylindrical pellets using uniaxial die-pressing. The pellets were sintered at three different temperatures, i.e., 1200, 1300 and 1400°C for 5 h. Microstructural analysis of the pellets showed that the average grain size increased with the increase in sintering temperature. The sintered densities of the pellets were measured by Archimedes' method, and the relative density values were within the range of 78 %TD to 87 %TD as the sintering temperature increased from 1200 to 1400°C. Electrochemical impedance spectroscopy analysis showed that conductivity increased with the increase in sintering temperature, but no considerable change in conductivity was observed for the pellets sintered at 1300 and 1400°C. The results revealed that the electrolyte pellet sintered at 1300°C exhibited the ionic conductivity of 0.005 S/cm with lowest activation energy of 0.7275 eV.

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“…The ionic conductivity of the zirconium-based electrolyte measured by Raghvendra et al [ 11 ] at 760 °C was only 0.0016 S·cm −1 . The introduction of low-valence oxides into the YSZ electrolyte to increase the sintering activity while generating more oxygen vacancies is the most common modification to lower the sintering temperature of the YSZ electrolyte and increase its mid-temperature conductivity [ 12 , 13 , 14 , 15 , 16 ]. Ok Sung Jeon et al [ 15 ] doped a trace of Fe 2 O 3 and increased its ionic conductivity.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Bi2O3–YSZ and YSB–YSZ Composite Powders by a Microemulsion Method and Their Performance as Electrolytes in a Solid Oxide Fuel Cell

et al. 2023

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Bi2O3 is a promising sintering additive for YSZ that not only decreases its sintering temperature but also increases its ionic conductivity. However, Bi2O3 preferably grows into large-sized rods. Moreover, the addition of Bi2O3 induces phase instability of YSZ and the precipitation of monoclinic ZrO2, which is unfavorable for the electrical property. In order to precisely control the morphology and size of Bi2O3, a microemulsion method was introduced. Spherical Bi2O3 nanoparticles were obtained from the formation of microemulsion bubbles at the water–oil interface due to the interaction between the two surfactants. Nanosized Bi2O3–YSZ composite powders with good mixing uniformity dramatically decreased the sintering temperature of YSZ to 1000 °C. Y2O3-stabilized Bi2O3 (YSB)–YSZ composite powders were also fabricated, which did not affect the phase of YSZ but decreased its sintering temperature. Meanwhile, the oxygen vacancy concentration further increased to 64.9% of the total oxygen with the addition of 5 mol% YSB. In addition, its ionic conductivity reached 0.027 S·cm−1 at 800 °C, one order of magnitude higher than that of YSZ. This work provides a new strategy to simultaneously decrease the sintering temperature, stabilize the phase and increase the conductivity of YSZ electrolytes.

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Effect of Li₂O additions upon the crystal structure, sinterability and electrical properties of yttria stabilized zirconia electrolyte

Abstract: By adding 0.5 mol% Li2O, YSZ was densified at 1250 °C, and also had a high conductivity of 0.0313 S cm−1 at 800 °C.

Cited by 7 publications

References 36 publications

Structural, Thermal, and Electrochemical Properties of Ce 0.8−2x Sm 0.2 Zrx Mgx O2−d, {x = 0.05, 0.1 & 0.15} Promising Electrolyte Compounds for (IT-SOFCs) Applications

Structural, Thermal, and Electrochemical Properties of Ce 0.8−2x Sm 0.2 Zrx Mgx O2−d, {x = 0.05, 0.1 & 0.15} Promising Electrolyte Compounds for (IT-SOFCs) Applications

Effect of sintering temperature on the microstructure and ionic conductivity of Ce0.8Sm0.1Ba0.1O2-δ electrolyte

Preparation of Bi2O3–YSZ and YSB–YSZ Composite Powders by a Microemulsion Method and Their Performance as Electrolytes in a Solid Oxide Fuel Cell

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Effect of Li2O additions upon the crystal structure, sinterability and electrical properties of yttria stabilized zirconia electrolyte

Abstract: By adding 0.5 mol% Li2O, YSZ was densified at 1250 °C, and also had a high conductivity of 0.0313 S cm−1 at 800 °C.

Cited by 7 publications

References 36 publications

Structural, Thermal, and Electrochemical Properties of Ce 0.8−2x Sm 0.2 Zrx Mgx O2−d, {x = 0.05, 0.1 & 0.15} Promising Electrolyte Compounds for (IT-SOFCs) Applications

Structural, Thermal, and Electrochemical Properties of Ce 0.8−2x Sm 0.2 Zrx Mgx O2−d, {x = 0.05, 0.1 & 0.15} Promising Electrolyte Compounds for (IT-SOFCs) Applications

Effect of sintering temperature on the microstructure and ionic conductivity of Ce0.8Sm0.1Ba0.1O2-δ electrolyte

Preparation of Bi2O3–YSZ and YSB–YSZ Composite Powders by a Microemulsion Method and Their Performance as Electrolytes in a Solid Oxide Fuel Cell

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Effect of Li₂O additions upon the crystal structure, sinterability and electrical properties of yttria stabilized zirconia electrolyte