Electrical properties of heterogeneously doped yttria stabilized zirconia

Kumar, Binod; Chen, Christina; Varanasi, C.; Fellner, Joseph P.

doi:10.1016/j.jpowsour.2004.08.016

Cited by 33 publications

(29 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus alumina has very limited solubility in GDC. The solubility of Al 2 O 3 in zirconia, which can form the same fluorite-structure, has been reported as less than 1 mol% [16,17]. The solubility of Al in CeO 2 was reported as less than 2 mol% [9].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The effect of alumina addition on the electrical conductivity of Gd-doped ceria

2006

View full text Add to dashboard Cite

Acceptor doped-ceria is a possible electrolyte material for the IT-SOFC (intermediate temperature solid oxide fuel cell) due to its high oxygen-ion conductivity. However, its use has been limited by its mechanical weakness and the appearance of electronic conductivity in reducing condition. In this study, alumina was selected as an additive in the dopedceria to see if it increases the oxygen-ion conductivity and mechanical strength. Effects of alumina addition in doped ceria were studied as a function of alumina content and acceptor (Gd) content.The electrical conductivity of (Ce 1−x Gd x O 2−δ ) 1−y + (Al 2 O 3 ) y (x = 0-0.35, y = 0-0.10) was measured by using impedance spectroscopy. The grain conductivity of Ce 0.8 Gd 0.2 O 2-δ (GDC20) with 5 mol% alumina increased ∼3 times from that of GDC20 at 300 • C. The grain conductivity was even ∼2 times higher than that of Ce 0.9 Gd 0.1 O 2−δ (GDC10) at 300 • C. The electrical conductivity of GDC20 without alumina addition, measured at 500 • C in air, rapidly decreased after exposure to reducing condition (Po 2 ∼10 −22 atm) at 800 • C. However, the decrease was much slower in GDC20 with alumina addition, indicating the improved mechanical strength.Among the examined compositions, (Ce 0.75 Gd 0.25 O 2-δ ) 0.95 + (Al 2 O 3 ) 0.05 (GDC25A5) showed the highest conductivity at most temperatures.

show abstract

Section: Resultsmentioning

confidence: 99%

“…[15][16][17][18]. In this study, we studied the effect of alumina addition on the electrical conductivity and the mechanical properties of ceria.…”

Section: Introductionmentioning

confidence: 99%

The effect of alumina addition on the electrical conductivity of Gd-doped ceria

2006

View full text Add to dashboard Cite

show abstract

“…On the contrary, the presence of Al 2 O 3 also leads to a blocking effect that suppresses conductivity. The combined effects result in minimal effect of Al 2 O 3 doping on YSZ conductivity [32]. Recently, addition of Bi 2 O 3 was found to stabilize the cubic phase of ScSZ at a lower temperature.…”

Section: Article In Pressmentioning

confidence: 99%

Technological development of hydrogen production by solid oxide electrolyzer cell (SOEC)

Leung

2008

International Journal of Hydrogen Energy

617

327

View full text Add to dashboard Cite

“…After this seminal discovery, many heterogeneous composites have followed, and some of them have shown a positive conductive effect. [74][75][76] This behavior has even been demonstrated in bilayer thin films without adding inert oxide particles. 77 Sata et al made a bilayer thin film system of BaF 2 /CaF 2 having F-ionic conduction and showed that the thinner each layer was, the higher the degree of conductivity of the thin film.…”

Section: Interfacial Conduction Of Heterostructured Materialsmentioning

confidence: 79%

“…26,[73][74][75][76] As a result, some heterogeneous nanostructured materials showing an enhancement in conductivity have been discovered in several ionic conductors.…”

Section: Interfacial Conduction Of Heterostructured Materialsmentioning

confidence: 99%