Monolithic Fuel Cells

Fee, D.C.; Billone, M.C.; Busch, D.E.; Dees, Dennis W.; Dusek, J.T.; Easier, T. E.; Ellingson, W. A.; Flandermeyer, B. K.; Fousek, R.J.; Heiberger, J.J.; Majumdar, S.; McPheeters, C.C.; Hrazek, F. C.; Picciolo, J. J.; Poeppel, R.B.

doi:10.2514/6.1987-9202

Cited by 3 publications

(3 citation statements)

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“…A similar effect was observed for CaO-doped LaCrOa (24). Researchers in Argonne National Laboratory found that fluoride mixtures can work well as sintering aids for LaCrO3 film (5,25).…”

Section: Addition Of Sintering Aids--several Percent Of Sro Orsupporting

confidence: 56%

Chemical Thermodynamic Considerations in Sintering of LaCrO3 ‐ Based Perovskites

Yokokawa

Sakai

Kawada

et al. 1991

J. Electrochem. Soc.

149

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The thermodynamic properties of LaCrOa and related compounds have been estimated and utilized to correlate sinterability with phase relations in the La-M-Cr-O (M = Mg,Ca,Sr) systems. Chemical equilibria calculations reveal that calculated vapor pressures of gaseous chromium oxides (especially CrO3) can be well correlated with our previous experimental results on sinterability. The poor sinterability can be ascribed to the formation of a thin layer of Cr203(s) which is formed from incongruently vaporized CrO3(g) at the interparticle neck during the initial stage of sintering in air. Improvement of sinterability of Cr203-based oxides can be achieved by removing this CrzO3 layer or by decreasing CrO3(g) vapor pressure to prevent the formation of Cr203 layer. These suggest that (La~-~Ca~)CrO3 perovskites are the most suitable materials for high sinterability, since these materials have the low CrOa vapor pressure without precipitation of La2Oa.The lanthanum-chromite based perovskites have been extensively investigated for applications in MHD electrodes (1), heating elements (2), and solid oxide fuel cell (SOFC) separators (in other words, interconnectors or bipolar plates) (3-6). When this material is used as SOFC separators to be placed between air and fuel, material requirements become severer (7, 8). Earlier investigations (9-16) revealed that LaCrO3 is chemically quite stable in both oxidizing and reducing atmospheres, and exhibits a good electronic conductivity when alkaline earth oxides are doped. Even so, LaCrO3 is known as poorly sinterable in air (11). Since SOFC separators should be dense, making LaCrOs air sinterable is thus the crucial point in fabricating a separator with LaCrO3-based perovskites.Several attempts have been made to enhance densification of LaCrO3 as follows:Sintering in reducing atmospheres.--Anderson (10) revealed that dense materials can be obtained by sintering at 1973 K in an atmosphere reducing enough to reduce Cr203 into Cr. Song et al. (17,18) also obtained dense CaO-doped

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“…A similar effect was observed for CaO-doped LaCrOa (24). Researchers in Argonne National Laboratory found that fluoride mixtures can work well as sintering aids for LaCrO3 film (5,25).…”

Section: Addition Of Sintering Aids--several Percent Of Sro Orsupporting

confidence: 56%

Chemical Thermodynamic Considerations in Sintering of LaCrO3 ‐ Based Perovskites

Yokokawa

Sakai

Kawada

et al. 1991

J. Electrochem. Soc.

149

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“…Thus, cell output depended strongly on the PSZ resistance. A group at Argonne National Laboratory has reported 2.2 A/cm 2 as SOFC output using a tape casting zirconia electrolyte (11) which was fabricated from FSZ powder of Zircar or Toyo Soda TZ-8Y (5). In a tape casted PSZ electrolyte, maximum current density of 1.9 A/cm ~ was obtained.…”

Section: Resultsmentioning

confidence: 99%

“…The basicity of these melts can be expressed as the pBrvalue (pBr-= -log a(Br-); a(Br ) means the bromide ion activity). Concerning the acid-base equilibrium in the A1-Br3-NaBr melts, Tremillon et al (11) reported the equilibrium constant of the following chemical reaction, which is dominant in the neutral region of the melt, by a coulometric titration method 2A1Br4 = A12Brc + Br-In this report, the over-all acid-base equilibria have been taken into account and individual equlibrium constant values evaluated on the basis of the EMF measurements of the following A1/A1 concentration cell, especially in the acid composition ranges [up to 65 mole percent (m/o) A1Br3] A1/A1Br3 -NaBr(sat. )//A1Br3 -NaBr(i)/A1 [1] where "i" indicates a melt composition.…”

Section: Acid + Br-= Basementioning

confidence: 99%

Properties of Partially Stabilized Zirconia Fuel Cell

Yoshida¹,

Hoshina²,

Mukaizawa³

et al. 1989

J. Electrochem. Soc.

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High Temperature Solid Oxide Regenerative Fuel Cell for Solar Photovoltaic Energy Storage

Bents

1987

22nd Intersociety Energy Conversion Engineering Conference

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This paper describes a hydrogen-oxygen regene r a t i v e f u e l c e l l (RFC) energy storage system based on h i g h temperature s o l i d oxide f u e l c e l l (SOFC) technology. The reactants a r e stored as gases i n l i g h t w e i g h t i n s u l a t e d pressure vessels. The product water i s stored as a l i q u i d i n satur a t e d e q u i l i b r i u m w i t h t h e f u e l gas. The system functions as a secondary b a t t e r y and I s a p p l icable t o darkside energy storage f o r s o l a r p h o t o v o l t a i c s .

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Monolithic Fuel Cells

Cited by 3 publications

References 0 publications

Chemical Thermodynamic Considerations in Sintering of LaCrO3 ‐ Based Perovskites

Chemical Thermodynamic Considerations in Sintering of LaCrO3 ‐ Based Perovskites

Properties of Partially Stabilized Zirconia Fuel Cell

High Temperature Solid Oxide Regenerative Fuel Cell for Solar Photovoltaic Energy Storage

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