Powder morphology modification and sinterability improvement of Ce0.8Sm0.2O1.9 derived from solution combustion process

Xu, Qing; Huang, Duan‐Ping; Zhao, Kai; Chen, Wen; Chen, Min; Kim, Bok‐Hee

doi:10.1016/j.ceramint.2010.10.036

Cited by 27 publications

(6 citation statements)

References 34 publications

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“…32 The lattice parameter expansion has been observed in previous studies. 33,34 However, single, binary, and ternary carbonates are amorphous in nature (no XRD peaks); thus, it has no effect on the lattice parameters. The goodness of fitting was calculated by the following reliable parameters: R p : 4.09, R wp : 5.27, R B : 1.02, R exp : 3.98, and χ 2 : 1.32.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Alkali Carbonates (Single, Binary, and Ternary) on Doped Ceria: A Composite Electrolyte for Low-Temperature Solid Oxide Fuel Cells

Ali

Rafique

Kaleemullah

et al. 2018

ACS Appl. Mater. Interfaces

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Samarium-doped ceria (SDC) carbonate has become an attractive electrolyte for fuel cells because of its remarkable ion conductivity and high performance. Different doped ceria-carbonate (single-carbonate SDC, binary-carbonate SDC, and ternary-carbonate SDC) electrolytes were synthesized by the coprecipitation/oxalate method, to optimize the electrochemical performance. The structure; morphology; and thermal, optical, and surface properties have been studied using a variety of techniques. The X-ray diffraction results confirmed the successful incorporation of samarium into ceria as a crystalline structure and inclusion of carbonate, which is amorphous in nature. To analyze the conduction mechanism, direct current conductivity was measured in a H/O atmosphere. Doped ceria-binary carbonate ((Li/Na)CO-SDC) showed the best conductivity of 0.31 S cm and power density of 617 mW cm, at 600 °C. The enhancement in the ionic conductivity and performance of the composites is due to the contribution of hybrid ions (O, H). The crystallite size of the composites was in the range 21-41 nm. For the calculation of band gaps, optical absorption spectra of the synthesized powders were analyzed, and they showed a red shift with the band gap energy in the range 2.6-3.01 eV, when compared to that of pure ceria (3.20 eV).

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Section: Resultsmentioning

confidence: 99%

“…The plots of (αhυ) 1/2 versus photon energy (hυ) are given in the insets of (4f) orbital. 34 The increase of UV absorption for SDCcarbonates is the indication of replacement of Ce 4+ ions with Sm 3+ ions, increasing the oxygen vacancy concentration. 35 The calculated band gap (E g ) is shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Effect of Alkali Carbonates (Single, Binary, and Ternary) on Doped Ceria: A Composite Electrolyte for Low-Temperature Solid Oxide Fuel Cells

Ali

Rafique

Kaleemullah

et al. 2018

ACS Appl. Mater. Interfaces

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“…The presence of second-phase particles prohibits the movement of the grain boundary; the grain size is thus smaller. The refined microstructure may consequently induce a better sinterability [17], allowing the density of doped CS specimens to therefore be higher. The strength of ceramics exhibits a power-law relationship with the amount of porosity [18].…”

Section: Discussionmentioning

confidence: 99%

Resorbable calcium sulfates with tunable degradation rate

Kuo

Tuan

2013

Journal of Asian Ceramic Societies

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The calcium sulfate (CS) tablets exhibit excellent osteoinductive and osteoconductive characteristics, they can be used to repair bone defects. However, the degradation rate of CS tablets is very fast. The present study demonstrates, for the first time, that the degradation rate of CS tablets can be manipulated through the use of sintering technique. Firing the CS tablets to a temperature of 1100 • C increases their relative density to a value above 90%. The density can be further enhanced to above 95% through the addition of 1 wt% sintering additives. The sintered CS tablets with the addition of sintering additives exhibit a high strength and a low cytotoxicity. More importantly, the degradation rate is tunable through the choice of sintering additives.

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“…Ce 0.8 Sm 0.2 O 1.9 (SDC) electrolyte was employed as the substrate of the half cells. These substrates were prepared from SDC powder synthesized by a GNP method and sintered at 1300°C for 2 hours in air. SmSFCr electrodes were prepared onto the electrolyte substrates by a screen printing technique.…”

Section: Methodsmentioning

confidence: 99%

Property evaluation of Sm _1‐x Sr _x Fe _0.7 Cr _0.3 O _3‐δ perovskites as cathodes for intermediate temperature solid oxide fuel cells

Xie

Xiao

et al. 2019

Int J Energy Res

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Summary Perovskite‐type (ABO3) complex oxides of Sm1‐xSrxFe0.7Cr0.3O3‐δ (x = 0.5‐0.7) series were prepared by a glycine‐nitrate combustion process. The crystal structure, oxygen nonstoichiometry, electrical conducting, thermal expansion, and electrocatalytic properties of Sm1‐xSrxFe0.7Cr0.3O3‐δ perovskites were inspected in view of their use as cathode materials for intermediate temperature solid oxide fuel cells (IT‐SOFCs). Changing the content of Sm3+ at the A‐site was demonstrated to be effective in tuning the structure and properties. The variation of the various properties with Sm3+ content was explained in relation to the corresponding evolution of the crystal structure and oxygen nonstoichiometry. Sm0.3Sr0.7Fe0.7Cr0.3O3‐δ (x = 0.7) was determined to be the optimal composition in the Sm1‐xSrxFe0.7Cr0.3O3‐δ series based on a trade‐off between the thermal expansion and electrocatalytic properties. Sm0.3Sr0.7Fe0.7Cr0.3O3‐δ ceramic specimen exhibited an electrical conductivity of approximately 40 S·cm−1 at 800°C and a thermal expansion coefficient of 14.1 × 10−6 K−1 averaged in the temperature range from 40°C to 1000°C. At 800°C in air, Sm0.3Sr0.7Fe0.7Cr0.3O3‐δ electrode showed a cathodic polarization resistance of 0.19 Ω·cm2, a cathodic overpotential of 30 mV at current density of 200 mA·cm−2, and an exchange current density of 257 mA·cm−2. It is suggested that Sm0.3Sr0.7Fe0.7Cr0.3O3‐δ is a potential candidate material for cathode of IT‐SOFCs in light of its overall properties.

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Powder morphology modification and sinterability improvement of Ce0.8Sm0.2O1.9 derived from solution combustion process

Cited by 27 publications

References 34 publications

Effect of Alkali Carbonates (Single, Binary, and Ternary) on Doped Ceria: A Composite Electrolyte for Low-Temperature Solid Oxide Fuel Cells

Effect of Alkali Carbonates (Single, Binary, and Ternary) on Doped Ceria: A Composite Electrolyte for Low-Temperature Solid Oxide Fuel Cells

Resorbable calcium sulfates with tunable degradation rate

Property evaluation of Sm _1‐x Sr _x Fe _0.7 Cr _0.3 O _3‐δ perovskites as cathodes for intermediate temperature solid oxide fuel cells

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Powder morphology modification and sinterability improvement of Ce0.8Sm0.2O1.9 derived from solution combustion process

Cited by 27 publications

References 34 publications

Effect of Alkali Carbonates (Single, Binary, and Ternary) on Doped Ceria: A Composite Electrolyte for Low-Temperature Solid Oxide Fuel Cells

Effect of Alkali Carbonates (Single, Binary, and Ternary) on Doped Ceria: A Composite Electrolyte for Low-Temperature Solid Oxide Fuel Cells

Resorbable calcium sulfates with tunable degradation rate

Property evaluation of Sm 1‐x Sr x Fe 0.7 Cr 0.3 O 3‐δ perovskites as cathodes for intermediate temperature solid oxide fuel cells

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Product

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Property evaluation of Sm _1‐x Sr _x Fe _0.7 Cr _0.3 O _3‐δ perovskites as cathodes for intermediate temperature solid oxide fuel cells