A brief review on ceria based solid electrolytes for solid oxide fuel cells

Jaiswal, Nandini; Tanwar, Khagesh; Rathod, Suman; Kumar, Devendra; Upadhyay, Shail; Parkash, Om

doi:10.1016/j.jallcom.2018.12.015

Cited by 192 publications

(93 citation statements)

References 129 publications

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“…Arrhenius plots were least‐square linear fitted to obtain the value of activation energy for grains, grain boundaries, and total conductivity of the samples and given in Table . The estimated values of the activation energy of the samples agree with the values reported for the diffusion of oxygen via oxygen vacancies in undoped and doped CeO 2 electrolytes . From Table , it is noted that the activation energy for grains conductivity for sample CGSO is slightly lower than that for CLSO.…”

Section: Resultsmentioning

confidence: 99%

“…The estimated values of the activation energy of the samples agree with the values reported for the diffusion of oxygen via oxygen vacancies in undoped and doped CeO 2 electrolytes. 3 From Table 1, it is noted that the activation energy for grains conductivity for sample CGSO is slightly lower than that for CLSO. The lower value of activation energy for the grains conductivity of CGSO is attributed to its lower lattice distortion (estimated from W-H using XRD) as compared to CLSO.…”

Section: Electrical Characterizationmentioning

confidence: 92%

“…Different combinations of trivalent (rare earth) and divalent (alkaline earth) cations have been used for partially replacing Ce in CeO 2. 3 The electrical properties of Sr co-doped ceria systems Ce 1-x-y Ca x Sr y O 2-δ , 4 Ce 1-x-y Y x Sr y O 2-δ , 5 Ce 1-x-y Mg x Sr y O 2-δ , 6 Ce 1-x-y Sm x Sr y O 2-δ , 7 Ce 1-x-y La x Sr y O 2-δ , 8,9 and Ce 1-x-y Gd x Sr y O 2-δ 10,11 have been investigated in detail. In these investigations, the powders were synthesized by the solid-state reaction method and auto combustion method.…”

Section: Introductionmentioning

confidence: 99%

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Sucrose‐nitrate auto combustion synthesis of Ce _0.85 Ln _0.10 Sr _0.05 O _{2‐
δ} (Ln = La and Gd) electrolytes for solid oxide fuel cells

et al. 2020

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Summary Nanocrystalline powders of co‐doped ceria oxides Ce0.85La0.10Sr0.05O2‐δ (CLSO) and Ce0.85Gda0.10Sr0.05O2‐δ (CGSO) have been synthesized by auto combustion method at 100°C using sucrose as fuel. Thermal analysis (TGA/DSC) of as‐prepared powders indicated calcination above 400°C to remove organic residue. The average grain size of the pellets sintered at 1200°C for 4 hours is 436 and 683 nm for CLSO and CGSO, respectively. The electrical conductivity of the sintered samples was determined by impedance measurements in the temperature range 300°C to 600°C and the frequency range 20 Hz to 2 MHz. At 600°C, the total electrical conductivity (σt) of CGSO is 6.78 × 10−3 S cm−1, 2.5 times higher than 2.72 × 10−3 S cm−1 of CLSO. Further, it is found that the value of grain boundaries blocking factor (αgb) of CGSO is 0.47 which is 30% lesser than 0.68 of CLSO at 600°C. The higher value of electrical conductivity of CGSO as compared to CLSO is attributed to the lesser blocking effect of grain boundaries, smaller lattice distortion and denser microstructure of CGSO as compared to CLSO. The electrical conductivity of synthesized samples has been compared with the electrical conductivity of similar compositions of co‐doped CeO2 oxides. Our study indicated that the sintering temperature, and hence, the morphology of sintered samples has a significant role in determining the electrical conductivity. The presence of oxygen vacancies in the synthesized samples is experimentally supported by using UV‐visible spectroscopy, Raman spectroscopy, and thermal analysis techniques.

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Section: Resultsmentioning

confidence: 99%

Section: Electrical Characterizationmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Sucrose‐nitrate auto combustion synthesis of Ce _0.85 Ln _0.10 Sr _0.05 O _{2‐
δ} (Ln = La and Gd) electrolytes for solid oxide fuel cells

et al. 2020

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“…Among the most well studied O 2− conductors, there are four structural types: fluorite, perovskites, brownmillerites, and pyrochlores. [46,[71][72][73][74][75][76][77][78] In this study, we considered the A 2 B 2 O 7 pyrochlore type with A = Gd or Y and B = Ti or Zr as an example. This structure has recently been found to exhibit a range of electrical properties of interest associated with their compositional flexibility.…”

Section: Divalent Anion-based Inorganic Compoundsmentioning

confidence: 99%

A Database of Ionic Transport Characteristics for Over 29 000 Inorganic Compounds

Zhang

Zhao

et al. 2020

Adv Funct Materials

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Transport characteristics of ionic conductors play a key role in the performance of electrochemical devices such as solid‐state batteries, solid‐oxide fuel cells, and sensors. Despite the significance of the transport characteristics, they have been experimentally measured only for a very small fraction of all inorganic compounds, which limits the technological progress. To address this deficiency, a database containing crystal structure information, ion migration channel connectivity information, and 3D channel maps for over 29 000 inorganic compounds is presented. The database currently contains ionic transport characteristics for all potential cation and anion conductors, including Li+, Na+, K+, Ag+, Cu(2)+, Mg2+, Zn2+, Ca2+, Al3+, F−, and O2−, and this number is growing steadily. The methods used to characterize materials in the database are a combination of structure geometric analysis based on Voronoi decomposition and bond valence site energy (BVSE) calculations, which yield interstitial sites, transport channels, and BVSE activation energy. The computational details are illustrated on several typical compounds. This database is created to accelerate the screening of fast ionic conductors and to accumulate descriptors for machine learning, providing a foundation for large‐scale research on ion migration in inorganic materials.

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“…Rare earth (RE)-doped ceria systems form one of the most thoroughly studied families of RE oxides for their manifold properties, which make them interesting as catalysts for various processes of CO 2 valorization [1][2][3], and also as solid electrolytes in solid oxide fuel cells [4][5][6]. The latter application makes them a valid alternative to the commonly employed Y 2 O 3 -stabilized ZrO 2 , as they present high ionic conductivity in the intermediate temperature range (673-973 K), which in principle allows them to lower the cell operating temperature.…”

Section: Introductionmentioning

confidence: 99%

Transport Properties and High Temperature Raman Features of Heavily Gd-Doped Ceria

et al. 2019

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Transport and structural properties of heavily doped ceria can reveal subtle details of the interplay between conductivity and defects aggregation in this material, widely studied as solid electrolyte in solid oxide fuel cells. The ionic conductivity of heavily Gd-doped ceria samples (Ce1−xGdxO2−x/2 with x ranging between 0.31 and 0.49) was investigated by impedance spectroscopy in the 600–1000 K temperature range. A slope change was found in the Arrhenius plot at ~723 K for samples with x = 0.31 and 0.34, namely close to the compositional boundary of the CeO2-based solid solution. The described discontinuity, giving rise to two different activation energies, points at the existence of a threshold temperature, below which oxygen vacancies are blocked, and above which they become free to move through the lattice. This conclusion is well supported by Raman spectroscopy, due to the discontinuity revealed in the Raman shift trend versus temperature of the signal related to defects aggregates which hinder the vacancies movement. This evidence, observable in samples with x = 0.31 and 0.34 above ~750 K, accounts for a weakening of Gd–O bonds within blocking microdomains, which is compatible with the existence of a lower activation energy above the threshold temperature.

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A brief review on ceria based solid electrolytes for solid oxide fuel cells

Cited by 192 publications

References 129 publications

Sucrose‐nitrate auto combustion synthesis of Ce _0.85 Ln _0.10 Sr _0.05 O _{2‐
δ} (Ln = La and Gd) electrolytes for solid oxide fuel cells

Sucrose‐nitrate auto combustion synthesis of Ce _0.85 Ln _0.10 Sr _0.05 O _{2‐
δ} (Ln = La and Gd) electrolytes for solid oxide fuel cells

A Database of Ionic Transport Characteristics for Over 29 000 Inorganic Compounds

Transport Properties and High Temperature Raman Features of Heavily Gd-Doped Ceria

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A brief review on ceria based solid electrolytes for solid oxide fuel cells

Cited by 192 publications

References 129 publications

Sucrose‐nitrate auto combustion synthesis of Ce 0.85 Ln 0.10 Sr 0.05 O 2‐ δ (Ln = La and Gd) electrolytes for solid oxide fuel cells

Sucrose‐nitrate auto combustion synthesis of Ce 0.85 Ln 0.10 Sr 0.05 O 2‐ δ (Ln = La and Gd) electrolytes for solid oxide fuel cells

A Database of Ionic Transport Characteristics for Over 29 000 Inorganic Compounds

Transport Properties and High Temperature Raman Features of Heavily Gd-Doped Ceria

Contact Info

Product

Resources

About

Sucrose‐nitrate auto combustion synthesis of Ce _0.85 Ln _0.10 Sr _0.05 O _{2‐
δ} (Ln = La and Gd) electrolytes for solid oxide fuel cells

Sucrose‐nitrate auto combustion synthesis of Ce _0.85 Ln _0.10 Sr _0.05 O _{2‐
δ} (Ln = La and Gd) electrolytes for solid oxide fuel cells