Enhanced proton conductivity of yttrium-doped barium zirconate with sinterability in protonic ceramic fuel cells

Seo, Yongho; Kim, Ki Buem; Song, Sun-Ju; Park, Byoungnam; Park, Jun-Young

doi:10.1016/j.jallcom.2015.03.168

Cited by 64 publications

(37 citation statements)

References 44 publications

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“…Currently,2 0mol %Y -doped BaZrO 3 (BaZr 0.8 Y 0.2 O 3Àd ,B ZY20) attracts the mosta ttention [3][4][5][6] owing to its high proton conductivity (e.g., > 0.01 Scm À1 at 450 8C), [7] almost pure proton conduction in ah umid hydrogen atmosphere, [8,9] and excellent chemicals tability against reaction with CO 2 . [10,11] However,t he refractory nature of BZY20 requires ah ighs intering temperature (at least 1600 8C), which leads to as ignificant challenge for its implementation in fuel cells· [12] Adding sintering addi-tives, such as NiO, [13][14][15] CuO, [15,16] or ZnO, [12,[17][18][19] can effectively reduce the sintering temperature to approximately 1400 8C, and is already widely adopted to process BZY20. However, even without deliberativelyi ntroducing as intering additive, NiO in the anode substrate (lately in situ reduced to aN i anode catalyst) providesa nother source of sintering additive.…”

Section: Introductionmentioning

confidence: 99%

Detrimental Effect of Sintering Additives on Conducting Ceramics: Yttrium‐Doped Barium Zirconate

et al. 2018

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Y-doped BaZrO (BZY) is currently the most promising proton-conductive ceramic-type electrolyte for application in electrochemical devices, including fuel cells and electrolyzer cells. However, owing to its refractory nature, sintering additives, such as NiO, CuO, or ZnO are commonly added to reduce its high sintering temperature from 1600 °C to approximately 1400 °C. Even without deliberately adding a sintering additive, the NiO anode substrate provides another source of the sintering additive; during the co-sintering process, NiO diffuses from the anode into the BZY electrolyte layer. In this work, a systematic study of the effect of NiO, CuO, and ZnO on the electroconductive properties of BaZr Y O (BZY20) is conducted. The results revealed that the addition of NiO, CuO, or ZnO into BZY20 not only degraded the electrical conductivity but also resulted in enhancement of the hole conduction. Removal of these sintering additives can be realized by post-annealing in hydrogen at a mild temperature of 700 °C, but it is kinetically very slow. Therefore, the addition of NiO, CuO, and ZnO is detrimental to the electroconductive properties of BZY20, and significantly restrict its application as an electrolyte. The development of new sintering additives, new anode catalysts, or new methods for preparing BZY electrolyte-based cells is urgently needed.

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Section: Introductionmentioning

confidence: 99%

Detrimental Effect of Sintering Additives on Conducting Ceramics: Yttrium‐Doped Barium Zirconate

et al. 2018

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“…A focus of the recent research on electrolyte development has been on proton conducting perovskites such as acceptor-doped BaZrO 3 and BaCeO 3 . The BaZrO 3 -based conductors are chemically stable over a wide range of temperatures and atmospheres, but very difficult to sinter [1][2][3]. By contrast, the BaCeO 3 -based conductors are easy to sinter, but chemically unstable in CO 2 -containing atmospheres [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Synergetic proton conduction in BaZr0.8Y0.2O3-δ–carbonate composite electrolyte for intermediate-temperature solid oxide fuel cells

et al. 2015

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“…However, the cerates react badly with CO 2 and become dysfunctional. Despite many efforts to improve the performance of BC-based electrolytes, BaZrO 3 (BZ) and its derivatives 12–15 are considered as alternatives. The BZ-based electrolytes are chemically stable, but challenged by low conductivity at the desired temperature range.…”

Section: Introductionmentioning

confidence: 99%

Proton Transfer in Molten Lithium Carbonate: Mechanism and Kinetics by Density Functional Theory Calculations

Lei

Huang

Qin

2017

Sci Rep

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Using static and dynamic density functional theory (DFT) methods with a cluster model of [(Li2CO3)8H]+, the mechanism and kinetics of proton transfer in lithium molten carbonate (MC) were investigated. The migration of proton prefers an inter-carbonate pathway with an energy barrier of 8.0 kcal/mol at the B3LYP/6-31 G(d,p) level, which is in good agreement with the value of 7.6 kcal/mol and 7.5 kcal/mol from experiment and FPMD simulation, respectively. At transition state (TS), a linkage of O–H–O involving O 2p and H 1 s orbitals is formed between two carbonate ions. The calculated trajectory of H indicates that proton has a good mobility in MC, oxygen can rotate around carbon to facilitate the proton migration, while the movement of carbon is very limited. Small variations on geometry and atomic charge were detected on the carbonate ions, implying that the proton migration is a synergetic process and the whole carbonate structure is actively involved. Overall, the calculated results indicate that MC exhibits a low energy barrier for proton conduction in IT-SOFCs.

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Enhanced proton conductivity of yttrium-doped barium zirconate with sinterability in protonic ceramic fuel cells

Cited by 64 publications

References 44 publications

Detrimental Effect of Sintering Additives on Conducting Ceramics: Yttrium‐Doped Barium Zirconate

Detrimental Effect of Sintering Additives on Conducting Ceramics: Yttrium‐Doped Barium Zirconate

Synergetic proton conduction in BaZr0.8Y0.2O3-δ–carbonate composite electrolyte for intermediate-temperature solid oxide fuel cells

Proton Transfer in Molten Lithium Carbonate: Mechanism and Kinetics by Density Functional Theory Calculations

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