Evaluation of volatile behaviour and the volatilization volume of molten salt in DIR-MCFC by using the image measurement technique

Sugiura, Kanematsu; Yamauchi, M.; Tanimoto, Kazumi; Yoshitani, Yasumasa

doi:10.1016/j.jpowsour.2004.12.079

Cited by 20 publications

(4 citation statements)

References 2 publications

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“…Furthermore, no significant secondary phase peaks can be observed, indicating potassium (K) incorporates successfully into the main structure. Moreover, no shift with K-content is observed in the main peaks, probably due to the low amount of K in the samples associated to a possible K evaporation [20,21]. Additionally, despite the incongruent melting of these compounds, very low amount of secondary phases could be identified, labeled as * , which correspond to an orthorhombic Bi 6 Ca 4 O 13 secondary phase [22], in agreement with previous works [23].…”

Section: Resultssupporting

confidence: 86%

Detailed low temperature studies on thermoelectric performance of K-doped Bi₂Ca₂Co₂O_y ceramics fibers

Özçelik¹,

Depçi̇²,

Gül³

et al. 2022

Phys. Scr.

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The effect of K substitution for Ca in Bi2Ca2-xKxCo2Oy (x= 0.0, 0.05,0.075, 0.10, and 0.125) thermoelectric ceramics, produced via laser floating zone (LFZ) method, have been systematically investigated. XRD patterns are quite similar for all samples and main peaks in the patterns correspond to reflection planes of the thermoelectric phase together with small amount of secondary phases. SEM micrographs revealed well oriented grains along the growth direction, and the presence of three different contrasts, associated through EDS to different phases, namely, black (Co oxide), white (Bi poor phase) and grey (Bi2Ca2Co1.7Oy TE phase). It was also seen that the amount of secondary phases diminishes with K-increase. The room-temperature resistivity values sharply decrease from 0.75 mΩ.m for the undoped sample to 0.44 mΩ.m for the 0.05 K-doped one, increasing for higher doping. Seebeck coefficient also decreases from 190 μV/K in the pristine sample, to 160 μV/K in all the K-doped ones, at 390 K. Thermal conductivity increases with temperature up to around 250 K, decreasing at higher temperatures. Thermal conductivity at 390 K decreases from 1.1 W/K-m in the pristine sample to lower values by K-doping, reaching the minimum, 0.9 W/K-m, in the 0.125 K-doped one. As a result, the highest ZT value of has been determined in 0.05 K-doped sample, around 0.021 at 390 K.

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Section: Resultssupporting

confidence: 86%

Detailed low temperature studies on thermoelectric performance of K-doped Bi₂Ca₂Co₂O_y ceramics fibers

Özçelik¹,

Depçi̇²,

Gül³

et al. 2022

Phys. Scr.

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“…As it can be observed in this table, Na content is slightly lower than the nominal one, probably due to volatilization of Na 2 CO 3 during the laser texturing process. In general, volatilization of the molten Na 2 CO 3 is known as one the factors that limit the performance of molten carbonate fuel cells (MCFC), even operating at lower temperatures [23]. On the other hand, it is clear that the secondary phases decrease when the Na content is increased, in agreement with XRD results.…”

Section: Resultssupporting

confidence: 57%

Drastic modification of low temperature thermoelectric properties of Na-doped Bi2Sr2Co2Oy ceramics prepared via laser floating zone technique

Gül

Özçelık

Gürsul

et al. 2020

J Mater Sci: Mater Electron

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In this study, Bi 2 Sr 2−x Na x Co 2 O y (x = 0.0, 0.05, 0.075, 0.10, and 0.15) ceramic powders have been fabricated via the classical ceramic route, followed by a texturing process through the laser floating zone technique. XRD patterns show the thermoelectric phase as the major one. In addition, Na-substitution reduces the amount of secondary phases, when compared to the pure sample. SEM observations point out that grain orientation is significantly improved when Na-content is increased. Na-substitution reduces electrical resistivity from 35 (in pure samples) to 19.6 mΩ cm (in Na = 0.05 ones) at around room temperature, while Seebeck coefficient is, approximately, twice measured in Na-free. On the other hand, thermal conductivity is slightly lower in undoped samples (0.83 W/K m), when compared to the Na-substituted ones (1.10-1.40 W/K m) at room temperature, due to their lower electrical conductivity. Finally, ZT values are higher when the Na-content is increased, reaching 0.022 at around 400 K.

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“…Moreover, under discussed sintering conditions, potassium carbonate itself can undergo the hydrolysis reaction. In general, volatilization of the molten K 2 CO 3 is known as one the factors that limit the performance of molten carbonate fuel cells (MCFC), even operating at lower temperatures [23]. The carbonate losses in this case are further facilitated by the presence of water traces, due to the formation of alkali hydroxides, which have a vapor pressure of about an order of magnitude higher than the corresponding carbonates.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Ca3Co4O9 microstructure and performances using a transient liquid phase sintering additive

Sotelo

Costa

Ferreira

et al. 2016

Journal of the European Ceramic Society

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Evaluation of volatile behaviour and the volatilization volume of molten salt in DIR-MCFC by using the image measurement technique

Cited by 20 publications

References 2 publications

Detailed low temperature studies on thermoelectric performance of K-doped Bi₂Ca₂Co₂O_y ceramics fibers

Detailed low temperature studies on thermoelectric performance of K-doped Bi₂Ca₂Co₂O_y ceramics fibers

Drastic modification of low temperature thermoelectric properties of Na-doped Bi2Sr2Co2Oy ceramics prepared via laser floating zone technique

Tailoring Ca3Co4O9 microstructure and performances using a transient liquid phase sintering additive

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Evaluation of volatile behaviour and the volatilization volume of molten salt in DIR-MCFC by using the image measurement technique

Cited by 20 publications

References 2 publications

Detailed low temperature studies on thermoelectric performance of K-doped Bi2Ca2Co2Oy ceramics fibers

Detailed low temperature studies on thermoelectric performance of K-doped Bi2Ca2Co2Oy ceramics fibers

Drastic modification of low temperature thermoelectric properties of Na-doped Bi2Sr2Co2Oy ceramics prepared via laser floating zone technique

Tailoring Ca3Co4O9 microstructure and performances using a transient liquid phase sintering additive

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Detailed low temperature studies on thermoelectric performance of K-doped Bi₂Ca₂Co₂O_y ceramics fibers

Detailed low temperature studies on thermoelectric performance of K-doped Bi₂Ca₂Co₂O_y ceramics fibers