Synthesis, densification and electrical properties of strontium cerate ceramics

Dahl, Paul Inge; Haugsrud, Reidar; Lein, Hilde Lea; Grande, Tor; Norby, Truls; Einarsrud, Mari‐Ann

doi:10.1016/j.jeurceramsoc.2007.03.025

Cited by 29 publications

(19 citation statements)

References 35 publications

(45 reference statements)

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“…3. The observed peak positions of the synthesized powders were compared with the literature data and were found to be similar to those of SrCe 0.95 Yb 0.05 O 3−ı [26] or SrZrO 3 [27,28]. It can be concluded that the perovskite formation is complete for the powders calcined at 1100 • C. This is consistent with the XRD result.…”

Section: Phase Formationsupporting

confidence: 84%

“…Sr(Ce 0.6 Zr 0.4 ) 0.95 Yb 0.05 O 3−ı is designed to have oxygen vacancies by a partial substitution of trivalent cations for the B-site tetravalent ones. In dry air, the following equilibrium is established: while in wet air, protons are formed in these oxides in accordance with the following defect equilibriums [32]: [26]. Introduction of Zr does not deteriorate the electrical property of SrCe 0.95 Yb 0.05 O 3−ı ceramics obviously, which is probably related to the preparation method.…”

Section: Electrical Propertiesmentioning

confidence: 81%

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Combustion synthesis and characterization of nanocrystalline proton conducting Sr(Ce0.6Zr0.4)0.95Yb0.05O3−δ

Zhang

Han

et al. 2009

Journal of Alloys and Compounds

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Section: Phase Formationsupporting

confidence: 84%

Section: Electrical Propertiesmentioning

confidence: 81%

Combustion synthesis and characterization of nanocrystalline proton conducting Sr(Ce0.6Zr0.4)0.95Yb0.05O3−δ

Zhang

Han

et al. 2009

Journal of Alloys and Compounds

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“…At the highest temperatures, the experimental open circuit voltage is lower than the calculated Nernst potential. This is attributed to a possible contribution at these temperatures of electronic conductivity in the electrolyte, as proposed in [10]. With decreasing temperature, the open circuit voltage reaches the calculated Nernst potential value, assessing the electrolyte integrity.…”

Section: First Pcfc Cell Resultsmentioning

confidence: 63%

“…95 Yb 0.05 O 3-d as electrolyte with porous Pt electrodes [9]. However, recent work from Dahl and Norby [10] highlights the major impact of water vapour partial pressure in hydrogen between 500 and 1,000°C on the total and partial conductivities of the same electrolyte. At low temperature proton conductivity is found to dominate for almost all p H 2 O whereas oxygen ion conductivity is almost negligible except in very dry atmospheres (p H 2 O \ 10 -4 ).…”

Section: Current Status Of Regular Sofc Operationmentioning

confidence: 99%

Current status of proton-conducting solid oxide fuel cells development

2009

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Solid oxide fuel cells (SOFC) are promising devices for high efficiency cogeneration. The most widely used and studied ones have an anion conducting electrolyte that requires high operating temperatures to limit ohmic losses across this electrolyte; temperatures typically range between 800 and 1,000°C. This temperature is associated with undesirable phenomena such as material interaction and insulating phase formation that result in unsatisfactory durability and high cost for market entry. Proton conducting solid oxide fuel cells (PCFC) constitutes a promising alternative since they allow a significant decrease in operating temperature. The Ba(Zr,Ce,Ln)O 3-d perovskite family exhibits ionic conductivities reaching 10 -2 to 10 -1 S cm -1 at temperatures as low as 600-700°C, these values being obtained with anion conducting SOFC between 700 and 1,000°C. On the basis of a review of work on half cells and complete cells, this paper addresses the main parameters that control and limit PCFC behaviour. This analysis aims at proposing recommendations for designing and testing proton conducting fuel cells.

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“…As shown in Eq. (3), the concentration of protons is a function of the partial pressure of water vapor and is approximately independent of the partial pressure of oxygen [12][13][14]. An exception is the increase in the proton concentration in strontium cerate upon the decrease in the partial pressure of oxygen [15,16] and is discussed in later section.…”

Section: Introductionmentioning

confidence: 94%

Platinum nanoparticle induced nanoionic effects on electrical conduction in strontium cerate and zirconate

Takamura

Leonard

Luo

et al. 2019

J Solid State Electrochem

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Heterointerfaces introduce unique localized defects into ionic conductors. This study explores the nanoionic characteristics exhibited by the proton-conducting oxides SrZr 0.9 Y 0.1 O 3-δ and SrCe 0.95 Yb 0.05 O 3-δ including finely dispersed precipitated platinum nanoparticles. The electrical conductivity of both the platinum-doped oxides revealed reversible nanoionic phenomena caused by the exsolution of the platinum in the form of platinum nanoparticles, at 0.5 vol% relative to the metal oxides, and dissolution in response to a change in gas atmosphere. In comparison with the original conductivity of SrZr 0.9 Y 0.1 O 3-δ and SrCe 0.95 Yb 0.05 O 3-δ , the conductivity of platinum-doped SrZr 0.9 Y 0.1 O 3-δ decreased significantly in a wet hydrogen atmosphere, whereas platinum-doped SrCe 0.95 Yb 0.05 O 3-δ showed almost no decrease in conductivity in the same atmosphere. The different responses of the two materials to the change in gas atmosphere are discussed in relation to the precipitation of platinum nanoparticles.

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Synthesis, densification and electrical properties of strontium cerate ceramics

Cited by 29 publications

References 35 publications

Combustion synthesis and characterization of nanocrystalline proton conducting Sr(Ce0.6Zr0.4)0.95Yb0.05O3−δ

Combustion synthesis and characterization of nanocrystalline proton conducting Sr(Ce0.6Zr0.4)0.95Yb0.05O3−δ

Current status of proton-conducting solid oxide fuel cells development

Platinum nanoparticle induced nanoionic effects on electrical conduction in strontium cerate and zirconate

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