Sintering behavior of lanthanide-containing glass-ceramic sealants for solid oxide fuel cells

Goel, Ashutosh; Reddy, Allu Amarnath; Pascual, María J.; Grémillard, Laurent; Malchère, Annie; Ferreira, J.M.F.

doi:10.1039/c2jm16300d

Cited by 40 publications

(26 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This effect was most pronounced for the smallest sized RE 3+ ions (Lu 3+ , Yb 3+ , Er 3+ , Y 3+ ), where no crystals were seen on slow cooling of the melt, a minor amount of crystallization was viewable in monolithic samples (under an electron microscope) when heated from room temperature, and crystals in amounts detectable by XRD were obtained only in glassceramics produced through nucleation and crystallization in glass powders. Similar results have also been reported by Goel et al [38] for rare-earth containing alkaline-earth aluminoborosilicate glass-ceramics. All oxyapatites large enough to be measured by EPMA were Ca-RE oxyapatites, with mostly the target RE with a minor amount of Nd (included in all samples to facilitate optical absorption measurements).…”

Section: Most Studies Of Oxyapatite Crystallization In Nuclear Waste supporting

confidence: 91%

Impact of rare earth ion size on the phase evolution of MoO3-containing aluminoborosilicate glass-ceramics

Patil

Konale

Gabel

et al. 2018

Journal of Nuclear Materials

Self Cite

View full text Add to dashboard Cite

Transition metal and rare earth cations are important fission products present in used nuclear fuel, which in high concentrations tend to precipitate crystalline phases in vitreous nuclear waste forms. Two phases of particular interest are powellite (CaMoO 4) and oxyapatite (Ca 2 RE 8 (SiO 4) 6 O 2). The glass compositional dependencies controlling crystallization of these phases on cooling from the melt are poorly understood. In the present study, the effect of rare earth identity and modifier cation field strength on powellite and apatite crystallization were studied in a model MoO 3-containing alkali/alkaline-earth aluminoborosilicate glass with focus on (1) influence of rare earth cation size (for RE 3+ : Ce, La, Nd, Sm, Er, Yb) and (2) influence of non-framework cations (RE 3+ , Mo 6+ , Na + , Ca 2+). Quenched glasses and glass-ceramics (obtained by slow cooling) were characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray absorption (XAS), and electron probe microanalysis (EPMA). All samples were X-ray amorphous upon quenching, except the Ce-containing composition which crystallized ceria (CeO 2), and the sample devoid of any rare earth cations which crystallized powellite (CaMoO 4). On heat treatment, powellite and oxyapatite crystallized in the majority of the samples with the former crystallizing in the volume, while the latter on the surface. The EPMA results confirmed a small concentration of boron in the oxyapatite crystal structure. RE cations were incorporated in the glass, as well as in powellite, oxyapatite, and in the case of Yb 3+ , keiviite (Yb 2 Si 2 O 7). Raman spectroscopy showed that the primary vibration band for molybdate MoO 4 2in the glasses was strongly affected by the ionic field strength of the modifying cations (alkali, alkaline earth, and RE), suggesting their proximity to the MoO 4 2ions in the glass, though the MoO bond length and coordination according to XAS suggested little local change.

show abstract

Section: Most Studies Of Oxyapatite Crystallization In Nuclear Waste supporting

confidence: 91%

Impact of rare earth ion size on the phase evolution of MoO3-containing aluminoborosilicate glass-ceramics

Patil

Konale

Gabel

et al. 2018

Journal of Nuclear Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…[3][4][5] Thus, numerous investigations have focused on developing highperformance materials for sealant and stack components. [6][7][8][9][10] However, our group discovered that the contact between components is also an important factor that infl uences stack output the TPB on the anode and cathode sides during cell manufacturing. The I -V behavior and impedance spectra obtained by the probes placed on both sides of the electrodes, as well as the electrolyte are regarded as a function of operation time.…”

Section: Introductionmentioning

confidence: 99%

In‐Situ Investigation of Quantitative Contributions of the Anode, Cathode, and Electrolyte to the Cell Performance in Anode‐Supported Planar SOFCs

Guan

Wang

et al. 2014

Advanced Energy Materials

View full text Add to dashboard Cite

performance, except for the materials of components when the stack is sealed properly. [11][12][13] Furthermore, the quantitative contributions of the resistance sources of components to stack performance were obtained by our group. We concluded that stack performance is signifi cantly affected by cell performance itself when excellent stack sealing and contact among internal components are provided. [ 14 ] Therefore, further improvement of cell performance (i.e., reducing cell resistance) and unit cell stability is crucial for SOFC stacks.Anode-supported planar SOFCs are widely used because of their superior performance and multi-layered structure that comprises several components (supported anode, anode function layer, electrolyte, and active cathode). [ 15,16 ] Thus, a quantitative understanding of how the cell components affect cell performance can function as a guide in optimizing cell performance. Accordingly, traditional methods, such as electrochemical impedance spectroscopy (EIS) and current-voltage ( I -V ) measurement, have been generally applied to investigate factors that affect cell performance using external probes placed on both sides of a unit cell. [17][18][19][20] However, traditional measurements do not distinguish between the quantitative effects of cell components on cell performance and degradation mechanisms. These effects result from complex physical and chemical processes at the triple-phase boundary (TPB) within the cell. Meanwhile, common I -V measurement or EIS can only obtain variation patterns in a unit cell rather than in the individual cell components. [ 21,22 ] Thus, special voltage probes embedded into the internal TPB are necessary to measure cell components (i.e., anode, electrolyte, and cathode) individually and to obtain their quantitative contributions on cell performance. However, for anode-supported planar SOFCs, the introduction of an internal voltage probe at the TPB within the cell is an immense challenge because of the thin electrolyte, [ 17 ] the active anode, [ 23 ] and the active cathode. [ 24 ] Consequently, an in situ investigation of the quantitative contributions of components (i.e., anode, electrolyte, and cathode) to cell performance has not been reported for anode-supported planar SOFCs.In the present work, a novel in situ measurement technique is developed according to the conventional structure of anode-supported SOFCs. Pt voltage probes are embedded into A novel method that embeds Pt voltage probes into the triple-phase boundary (TPB) is developed. Moreover, the quantitative contributions of the anode, the cathode, and the electrolyte to cell performance are investigated in situ for anode-supported planar solid oxide fuel cells (SOFCs). The voltage and maximum output power density (MOPD) measured by the probes, which are placed on both sides of the electrolyte, account for 97.3% and 94.4%, respectively, of those of the cell during the instantaneous current-voltage testing. When the stack is discharged at 0.32 A cm −2 for 200 h, the voltage drops of the an...

show abstract

“…8) are more complex with respect to other candidate sealants tested in previous works (e.g. [18,26]). The form of the spectra, their characteristic frequencies and estimated capacitances suggest the presence of two contributions i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y 3 7 ( 2 0 1 2 ) 1 2 5 2 8 e1 2 5 3 9 attributed to the crystalline and glassy phases; a small electrode tail is also visible in the low-frequency limit.…”

Section: Resultsmentioning

confidence: 96%

“…The equipment and procedures used for testing of electrical properties of the glasseceramic (sintered at 900 C for 1 h) sealants were described elsewhere [18,19]. The total conductivity (s) was determined by AC impedance spectroscopy (HP4284A precision LCR meter, 20 Hz À1 MHz) at 873e1123 K using dense GC disks with porous Pt electrodes, deposited onto both surfaces and sintered at 1073e1123 K.…”

mentioning

confidence: 99%

Diopside – Mg orthosilicate and diopside – Ba disilicate glass–ceramics for sealing applications in SOFC: Sintering and chemical interactions studies

Reddy

Tulyaganov

Goel³

et al. 2012

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

Sintering behavior of lanthanide-containing glass-ceramic sealants for solid oxide fuel cells

Cited by 40 publications

References 39 publications

Impact of rare earth ion size on the phase evolution of MoO3-containing aluminoborosilicate glass-ceramics

Impact of rare earth ion size on the phase evolution of MoO3-containing aluminoborosilicate glass-ceramics

In‐Situ Investigation of Quantitative Contributions of the Anode, Cathode, and Electrolyte to the Cell Performance in Anode‐Supported Planar SOFCs

Diopside – Mg orthosilicate and diopside – Ba disilicate glass–ceramics for sealing applications in SOFC: Sintering and chemical interactions studies

Contact Info

Product

Resources

About