Criteria for the application of high temperature proton conductors in SOFCs

Schober, T.; Krug, F.; Schilling, W.

doi:10.1016/s0167-2738(97)00028-3

Cited by 67 publications

(32 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6). The existence of proton conduction in perovskite-type structures has been well-established in the literature [31][32][33][34][35][36][37][38][39][40][41][52][53][54][55][56][57][58][59][60][61][62][63][64]; therefore, it will not be elaborated in this work. We have investigated the chemical stability of BCTY in CO 2 .…”

Section: Electrical Characterization Of Bctymentioning

confidence: 99%

“…During the heating and cooling runs, the Arrhenius plots fall on the same line, which verifies the equilibrium conductivity behavior. Several investigators have determined that the increase in electrical conductivity of acceptor-doped perovskites (e.g., ABO 3 A = Sr, Ba; B = Zr, Ce) and related ordered double perovskite-type Ba 3 CaNb 2 O 9 structures in wet atmospheres is primarily a result of proton conduction[52][53][54][55][56][57][58][59][60][61][62][63][64]. Among the samples studied, 5 mol% Ti-doped BaCe 0.75 Ti 0.05 Y 0.2 O 3-δ showed the highest electrical conductivity of 2.52×10 −3 S cm −1 at 650°C in H 2 +3% H 2 O (…”

mentioning

confidence: 99%

See 1 more Smart Citation

Electrical conductivity and chemical stability of perovskite-type BaCe0.8-x Ti x Y0.2O3-δ

Talimi

Thangadurai

2011

Ionics

View full text Add to dashboard Cite

Here we report the synthesis, chemical stability, and electrical conductivity of Ti-doped perovskite-type BaCe 0.8-x Ti x Y 0.2 O 3-δ (x=0.05, 0.1, 0.2, and 0.3; BCTY). Samples were synthesized by conventional solid state (ceramic) reaction from corresponding metal salts and oxides at elevated temperature of 1,300-1,500°C in air. The powder X-ray diffraction confirmed the formation of a simple cubic perovskite-type structure with a lattice constant of a=4.374(1), 4.377(1), and 4.332(1) Å for x=0.05, 0.1, and 0.2 members of BCTY, respectively. Like BaCe 0.8 Y 0.2 O 3-δ (BCY), Ti substituted BCTY was found to be chemically not stable in 100% CO 2 and form BaCO 3 at elevated temperature. The bulk electrical conductivity of BCTY decreased with increasing Ti content and the x=0.05 member exhibited the highest conductivity of 2.3×10 −3 S cm −1 at 650°C in air, while a slight increase in the conductivity, especially at low temperatures (below 600°C), was observed in humidified atmospheres.

show abstract

Section: Electrical Characterization Of Bctymentioning

confidence: 99%

mentioning

confidence: 99%

Electrical conductivity and chemical stability of perovskite-type BaCe0.8-x Ti x Y0.2O3-δ

Talimi

Thangadurai

2011

Ionics

View full text Add to dashboard Cite

show abstract

“…Associated with the oxygen vacancies protons may also be generated in the same process. In this case, proton conduction is mainly associated with the oxygen vacancy transport mechanism as is commonly observed in other proton conducting oxides [16].…”

Section: Defect Chemistry and Proton Conductionmentioning

confidence: 71%

Impedance spectroscopy study of gadolinia-doped ceria

Albinsson

Mellander

1999

Ionics

View full text Add to dashboard Cite

Abstract. The electrical properties of Gdo.lCeo.901.95 were investigated in various gas atmospheres using a.c. impedance spectroscopy. In dry oxygen, impedance spectra consisted of two arcs at low temperatures corresponding to bulk and grain boundary behaviour, respectively, and only one arc at high temperatures (T > 550 ~The results showed a high oxygen ion conductivity in oxygen atmosphere more than 10 -2 S/cm at 600 ~ In water atmospheres, the bulk arc in dry oxygen was reduced by 30 %, and an additional arc corresponding to the grain boundary effect appeared. It seems that the presence of water may decrease the bulk resistance, but causes an additional grain boundary resistance and thus increase in the total resistance. In hydrogen atmosphere, a conductivity enhancement up to one order of magnitude was observed. 'In hydrogen there is a reduction of Ce 4+ to Ce 3+ in the sample, which involves defect formation generating e.g. electrons, additional oxygen vacancies and at the same time protons in the lattice. These new charge carriers are responsible for a significant conductivity enhancement. Therefore, in a hydrogen atmosphere the material is a mixed (oxygen ion + proton + electron) conductor.

show abstract

“…One way to offset the too high operating temperature of SOFCs (700-1,000°C) is the use of a proton conducting electrolyte instead of an oxide conducting electrolyte [1][2][3]. Rare-earth substituted ABO 3 (A = alkaline earth, B = Ce, Zr, Ti) perovskites are studied for this application because of their high proton conductivity at 600°C and their stability in reducing atmosphere [4].…”

Section: Introductionmentioning

confidence: 99%

“…Kreuer pointed out a decrease in protonic defect mobility when the perovskite structures deviated from cubic [9]. A trivalent dopant such as yttrium is added to create oxygen vacancies by charge compensation [1,2,4,14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and proton incorporation in BaCe0.9−x Zr x Y0.1O3−δ

2008

View full text Add to dashboard Cite

BaCe 0.9-x Zr x Y 0.1 O 3-d powders were synthesized by a solid-state method at 1,400°C. Two compositions were studied (x = 0.3 and x = 0.7). Pellets were prepared and conventionally sintered in air at 1,700°C. Then, the samples were heated at 600°C for 3 h in different reducing atmospheres: dry hydrogen, wet hydrogen and wet deuterium. After each treatment, the proton diffusion depth profile was obtained using Secondary Ion Mass Spectroscopy (SIMS). Protons were not incorporated in the material when the gas was not wet, and the isotope effect suggests that protons present in the pellet come from water and not from hydrogen.

show abstract

Criteria for the application of high temperature proton conductors in SOFCs

Cited by 67 publications

References 7 publications

Electrical conductivity and chemical stability of perovskite-type BaCe0.8-x Ti x Y0.2O3-δ

Electrical conductivity and chemical stability of perovskite-type BaCe0.8-x Ti x Y0.2O3-δ

Impedance spectroscopy study of gadolinia-doped ceria

Synthesis and proton incorporation in BaCe0.9−x Zr x Y0.1O3−δ

Contact Info

Product

Resources

About