The effects of transition metal oxide doping on the sintering of cerium gadolinium oxide

Taub, Samuel; Williams, Robert E.A.; Wang, Xin; McComb, David W.; Kilner, John A.; Atkinson, A.

doi:10.1016/j.actamat.2014.06.041

Cited by 26 publications

(17 citation statements)

References 42 publications

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“…Avila-Paredes et al and other groups found out that the introduction of small amounts of Fe, Co, Mn, or Cu to Gd-doped ceria results in significant reduction of the grain boundary resistivity of the samples [30][31][32][33] while the total conductivity remains nearly similar or is even reduced in case of Mn. 33,34 Especially Co 32,35,36 and Fe, 32,[36][37][38] but to a lesser extent also Mn, 28,38,39 Ni, 36,38 Cu 32,38 and Zn 40,41 have besides been reported to facilitate the sintering of ceria ceramics while Cr, in contrast, was observed to suppress the sinterability of ceria. 31,35 At the same time, * Electrochemical Society Member.…”

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“…33,34 Especially Co 32,35,36 and Fe, 32,[36][37][38] but to a lesser extent also Mn, 28,38,39 Ni, 36,38 Cu 32,38 and Zn 40,41 have besides been reported to facilitate the sintering of ceria ceramics while Cr, in contrast, was observed to suppress the sinterability of ceria. 31,35 At the same time, * Electrochemical Society Member. z E-mail: kerstin.neuhaus@uni-muenster.de all transition metals, which were improving the sintering process were found to modify the charge transport within acceptor doped ceria as well.…”

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Assessment of the Effect of Transition Metal Oxide Addition on the Conductivity of Commercial Gd-Doped Ceria

Neuhaus¹,

Dolle²,

Wiemhöfer³

2018

J. Electrochem. Soc.

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The effect of addition of transition metal oxides on the charge transport of commercially available Gd-doped ceria (Ce 0.9 Gd 0.1 O 2-δ ) was assessed with special emphasis on the electronic partial conductivity. The samples were doped by adding 2, 4 or 6 cat% of CoO 3/4 or FeO 2/3 , or 2 mol% of the transition metal oxides V 2 O 5 , MnO 2 , and CuO, respectively. It was found that even small amounts of transition metal oxides severely change the partial electronic conductivity of ceria while the majority oxygen ion conductivity was only mildly affected: for high oxygen ion conductivity, Fe or Mn oxide addition as well as small amounts of Co oxide are beneficial, as especially the grain boundary conductivity is slightly increased. Addition of V or Cu oxide in contrast increases the minority charge carrier conductivity of electrons and thus enhances the mixed ionic-electronic conductivity. For Co oxide addition, an increasing electronic conductivity with decreasing oxygen partial pressure from 10 −8 to 10 −4 bar at temperatures below 600 • C indicates the changing redox state of Co from divalent at low oxygen partial pressures to trivalent under ambient oxygen partial pressure.

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confidence: 99%

Assessment of the Effect of Transition Metal Oxide Addition on the Conductivity of Commercial Gd-Doped Ceria

Neuhaus¹,

Dolle²,

Wiemhöfer³

2018

J. Electrochem. Soc.

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“…The La doping ratio was selected as 0.3 in the LST model, which was also employed by Park et al [29], in which the authors pointed out that the nanostructure of La 0.3 Sr 0.7 TiO 3-δ has the best thermoelectric performance and high thermal stability at the SOFC operating temperature. Generally, in order to achieve a suitable porous structure and a required density of the SOFC electrode, the sintering temperature should be higher than 1000 • C [30]. Here, using strontium nitrate, lanthanum nitrate, tetrabutyl titanate, etc., as raw materials, La 0.3 Sr 0.7 TiO 3-δ powder synthesized by ourselves via sol-gel method after sintering at 1400 • C for 5 h. The X-ray diffraction (XRD) patterns and the high-resolution transmission electron microscopy (HRTEM) image of LST powder are shown in Figure 4.…”

Section: Modeling Conditions and Validationmentioning

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Sintering Process and Effects on LST and LST-GDC Particles Simulated by Molecular Dynamics Modeling Method

et al. 2020

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During development of substitute anode materials suitable for solid oxide fuel cell (SOFC), understanding of sintering mechanisms and effects is significant for synthesized porous structures and performance. A molecular dynamics (MD) model is developed and applied in this study for the SOFC anode sintered materials to reveal the sintering condition effects. It is predicted that, for the case of two nanoparticles of electron-conducting La-doped SrTiO3 (LST), the higher the sintering temperature, the faster the aggregation of nanoparticles and the higher the sintering degree. An increase in the nanoparticle size could delay the sintering, process but does not affect the final sintering degree. The MD model is further applied for the case of the multi-nanoparticles containing LST and ion-conducting electrolyte materials of gadolinium-doped ceria (GDC), i.e., the LST-GDC particles. The sintering conditions and effects on the LST-GDC particles are evaluated, in terms of the mean square displacement (MSD) and various structural parameters. Two important thermal properties are also calculated that agree well with the experimental values. The findings obtained from this study are useful to identify the optimized sintering parameters for development of the SOFC electrode materials.

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“…This problem can be overcome by lowering the electrolyte resistance, the electrolyte thickness, or using alternative materials with higher ionic conductivity at lower temperatures. Although a previous study showed that LaGaO 3 -based oxides [260] and cerium oxide doped with gadolinium (GDC) [261,262] exhibits high oxide ion conductivity and are useful as electrolytes in intermediate temperature SOFCs, the thickness of the electrolyte is still an important key to develop technology of SOFCs. To fabricate more efficient and less expensive thin film SOFCs, an enhanced method to fabricate a porous electrode and non-porous electrolyte is needed.…”

Section: Applications Of the Electrophoresis Deposition For Solid Oxide Fuel Cellsmentioning

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A Comprehensive Review of Nanomaterials Developed Using Electrophoresis Process for High-Efficiency Energy Conversion and Storage Systems

et al. 2018

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Research carried out over the last few decades has shown that nanomaterials for energy storage and conversion require higher performance and greater stability. The nanomaterials synthesized by diverse techniques, such as sol-gel, hydrothermal, microwave, and co-precipitation methods, have brought energy storage and conversion systems to the center stage of practical application but they still cannot meet the capacity and mass production demands. Most reviews in the literature discuss in detail the issues related to nanomaterials with a range of structures synthesized using the above methods to enhance the performance. On the other hand, there have been few critical examinations of use of the electrophoresis process for the synthesis of nanomaterials for energy storage and conversion. The nanomaterials synthesized by electrophoresis processes related to colloidal interface science in the literature are compared according to the conditions to identify promising materials that are being or could be developed to satisfy the capacity and mass production demands. Therefore, a literature survey is of the use of electrophoresis deposition processes to synthesize nanomaterials for energy storage and conversion and the correlations of the electrophoresis conditions and properties of the resulting nanomaterials from a practical point of view.

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The effects of transition metal oxide doping on the sintering of cerium gadolinium oxide

Cited by 26 publications

References 42 publications

Assessment of the Effect of Transition Metal Oxide Addition on the Conductivity of Commercial Gd-Doped Ceria

Assessment of the Effect of Transition Metal Oxide Addition on the Conductivity of Commercial Gd-Doped Ceria

Sintering Process and Effects on LST and LST-GDC Particles Simulated by Molecular Dynamics Modeling Method

A Comprehensive Review of Nanomaterials Developed Using Electrophoresis Process for High-Efficiency Energy Conversion and Storage Systems

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