Effect of transition metal oxides doping on Ce0.9Sm0.05Nd0.05O1.95 solid electrolyte materials

Zhou, Ming; Ge, Lin; Chen, Han; Guo, Lucun

doi:10.1007/s40145-012-0013-1

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…24 Mixing of iron oxide (0.5 mol%) in gadolinium or samarium doped cerium oxide increased the density to $95% at the sintering temperature of 1500 C. 23,25 Generally the mixing of transition metals in CeO 2 has been carried out by solid state reaction techniques such as mechanical mixing or ball milling. 23,26 However the lattice level mixing of sintering aids inside the host lattice is very hard to achieve through those techniques due to the inhomogeneous segregation of the sintering aids. Also, ne homogenous nanoparticles are required in order to achieve higher density on sintering.…”

Section: Introductionmentioning

confidence: 99%

Role of iron addition on grain boundary conductivity of pure and samarium doped cerium oxide

2014

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The present paper reports the effect of iron doping (0.5, 1.5 mol%) on the densification and electrical properties of cerium oxide (CeO 2 ) and 20 mol% samarium-doped cerium oxide (SDC) electrolytes for intermediate temperature solid oxide fuel cell (ITSOFC) applications. A single-step solution combustion method was used for doping and the resultant powder was compacted into green pellets and subsequently sintered at 1200 C. X-ray diffraction (XRD) studies indicated the presence of a cubic fluorite CeO 2 structure without the formation of a secondary phase and the stoichiometry was confirmed by X-ray fluorescence spectroscopy. In the as-compacted green pellets, the XRD peak position shifted to lower or higher angles depending on the ionic radii of the dopants due to lattice level mixing. Addition of iron resulted in smaller crystallite sizes (<11 nm) in the case of the green pellet, while an opposite trend was observed (>40 nm) after sintering. Densification was found to be higher (95%) in iron-doped samples than in bare samples (<90%) due to viscous flow sintering. Upon sintering the calculated strain value showed a lower value due to the segregation of iron from the lattice. Raman spectroscopic studies indicate that sintering marginally modifies the oxygen vacancy concentration in the SDC system, and found it to be higher than in CeO 2 . Addition of iron into the SDC improved the grain boundary conductivity 1.8 fold, but only a minor change was noticed for CeO 2 . The activation energy for the grain boundary conductivity was found to be lower for 1.5 mol% (1.06 eV) iron-doped SDC than for pure SDC (1.24 eV). Our results indicate that lattice level mixing of iron in SDC improves the density at relatively lower sintering temperatures and scavenges the grain boundary impurities, thereby increasing the grain boundary conductivity.

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Section: Introductionmentioning

confidence: 99%

Role of iron addition on grain boundary conductivity of pure and samarium doped cerium oxide

2014

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“…However, rapid grain growth of the YSZ nano-particles leading to inhomogeneous microstructure and Y 2 O 3 segregation at elevated temperatures have been found to be critical issues [24]. Low-temperature densification of SOFC electrolytes by adding small amounts of sintering aids has also been widely reported [25][26][27][28]. Despite promising results from some sintering aids, the effect of sintering aids on the ionic conductivity and long-term stability of the electrolyte has been a concern.…”

Section: Introduction mentioning

confidence: 99%

Densification behavior of yttria-stabilized zirconia powders for solid oxide fuel cell electrolytes

Panthi

Hedayat

2018

J Adv Ceram

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Yttria-stabilized zirconia (YSZ) is the most common electrolyte material for solid oxide fuel cells. Herein, we conducted a comparative study on the densification behavior of three different kinds of commercial 8 mol% YSZ powders: (i) TZ-8Y (Tosoh, Japan), (ii) MELox 8Y (MEL Chemicals, UK), and (iii) YSZ-HT (Huatsing Power, China). The comparison was made on both the selfsupporting pellets and thin-film electrolytes coated onto a NiO-YSZ anode support. For the pellets, MELox 8Y showed the highest densification at lower sintering temperatures with 93% and 96% of the theoretical density at 1250 and 1300 ℃, respectively. Although YSZ-HT showed a higher sintering rate than TZ-8Y, a sintering temperature of 1350 ℃ was required for both the powders to reach 95% of the theoretical density. For the thin-film electrolytes, on the other hand, YSZ-HT showed the highest sintering rate with a dense microstructure at a co-sintering temperature of 1250 ℃. Our results indicate that besides the average particle size, other factors such as particle size distribution and post-processing play a significant role in determining the sintering rate and densification behavior of the YSZ powders. Additionally, a close match in the sintering shrinkage of the electrolyte and anode support is important for facilitating the densification of the thin-film electrolytes.

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“…(LSGM) electrolytes have been researched as alternatives to the YSZ [5][6][7]. Composite electrolytes have in recent years attracted much attention partly due to improved performances over the pure forms of the electrolytes and also helping to reduce the cost involved in having to use expensive electrolytes in their pure forms [8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of La10Si6O27 and Ce0.9Gd0.1O1.95 Solid Oxide Fuel Cell Electrolyte Material

Setsoafia

Hing

Jung

et al. 2015

AMM

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A Composite oxide ionic conductor consisting of La10Si6O27(LASIO) and Ce0.9Gd0.1O1.95(GDC) was synthesized by a modified sol-gel method. The La10Si6O27powders prepared by modified sol-gel synthesis were coated with GDC gel and latter calcined to form a La10Si6O27- Ce0.9Gd0.1O1.95composite material. The structural and microstructural properties of the composite were investigated using powder XRD, SEM and TMA. EIS was conducted in air on the sintered pellets to evaluate the electrochemical performance of the pellets. The conductivity of the composite electrolyte at 973 K was 26 mS /cm which is two orders of magnitudes higher than that for the pure LASIO but lower than that of the GDC (30 mS/cm). The thermal expansion of the composite electrolyte is similar to that obtained for the LASIO.

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Effect of transition metal oxides doping on Ce0.9Sm0.05Nd0.05O1.95 solid electrolyte materials

Cited by 8 publications

References 19 publications

Role of iron addition on grain boundary conductivity of pure and samarium doped cerium oxide

Role of iron addition on grain boundary conductivity of pure and samarium doped cerium oxide

Densification behavior of yttria-stabilized zirconia powders for solid oxide fuel cell electrolytes

Synthesis and Characterization of La<sub>10</sub>Si<sub>6</sub>O<sub>27</sub> and Ce<sub>0.9</sub>Gd<sub>0.1</sub>O<sub>1.95</sub> Solid Oxide Fuel Cell Electrolyte Material

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