Thermodesorption study of barium and strontium cerates

Aksenova, T.I.; Khromushin, I.V.; Zhotabaev, Zh.R.; Bukenov, K.D.; Berdauletov, A. K.; Medvedeva, Z. V.

doi:10.1016/s0167-2738(03)00228-5

Cited by 11 publications

(4 citation statements)

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“…Studies of the release of H 2 O and CO 2 from LCS and LSS were performed by thermodesorption spectroscopy (TDS) using an equipment based on vacuum chamber, heating device and radio frequency mass-spectrometer, which are described in detail in [17,18]. The vacuum during the experiment was 10 −5 Pa and the heating rate was 42 °C min −1 .…”

Section: Methodsmentioning

confidence: 99%

Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides

et al. 2019

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In this study, oxide materials La1−xCaxScO3−α (x = 0.03, 0.05 and 0.10) were synthesized by the citric-nitrate combustion method. Single-phase solid solutions were obtained in the case of calcium content x = 0.03 and 0.05, whereas a calcium-enriched impurity phase was found at x = 0.10. Water uptake and release were studied by means of thermogravimetric analysis, thermodesorption spectroscopy and dilatometry. It was shown that lower calcium content in the main phase leads to a decrease in the water uptake. Conductivity was measured by four-probe direct current (DC) and two-probe ascension current (AC) methods at different temperatures, pO2 and pH2O. The effects of phase composition, microstructure and defect structure on electrical conductivity, as well as correlation between conductivity and water uptake experiments, were discussed. The contribution of ionic conductivity of La1−xCaxScO3−α rises with decreasing temperature and increasing humidity. The domination of proton conductivity at temperatures below 500 °C under oxidizing and reducing atmospheres is exhibited. Water uptake and release as well as transport properties of La1−xCaxScO3−α are compared with the properties of similar proton electrolytes, La1−xSrxScO3−α, and the possible reasons for their differences were discussed.

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Section: Methodsmentioning

confidence: 99%

Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides

et al. 2019

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“…58 Besides structural and chemical instabilities, novel challenges such as delayed proton diffusion (proton trapping effect) additionally perturbs long-range proton conduction. Aksenova et al, 142 as a consequence, established proton trapping as a major concern due to perturbed electrochemical kinetics within doped barium and strontium cerates (BaCeO 3 and SrCeO 3 ). The grounds of which lie with defect cluster formation and revamped proton chemistry in the dopant neighborhood.…”

Section: Continuedmentioning

confidence: 99%

Technological Challenges and Advancement in Proton Conductors: A Review

Vignesh

Rout

2023

Energy Fuels

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Proton conductors (PCs) are multifunctional perovskite materials with structural, electrical, and chemical compatibilities that serve as principal components in proton conducting solid oxide fuel cells (PC-SOFC). The synergetic advantages of PC-SOFC dominate lucrative applications of conventional SOFC. However, adequate advantages accompany certain key limitations in PCs. The inverse interplay between proton conductivity and chemical stability are two broader challenges which demonstrate a clear trade-off. As a consequence, different reactive constituents within the host BaCeO 3 and BaZrO 3 PCs enforce the gradient in chemical stability under diverse atmospheres, while altered charge chemistry and structural perturbations escalate the activation barrier and impose reduced proton conductivity. Such occurrences are more pronounced in acceptor-doped PCs. Although material engineering via acceptor defect substitutions assists protonation and charge dynamics, on the other hand, it provokes novel challenges (proton trapping effect) at a higher dopant volume fraction beyond the threshold. The principal entropy among chemical and electrophysical parameters is proportionally associated with dopant-incorporated subcategorical material limitations. In this study, a compilation of factors responsible for structural and electrophysical diversities as a consequence of compositional-induced symmetry variations is highlighted with a plausible conclusion and future research perspectives for smart and advanced energy applications.

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“…PCs depend largely on hydroxide, oxygen ions, and proton characteristics in the host composition. Aksenova et al, 110 examining the kinetics of different mobile ions within doped barium and strontium cerate PCs (BaCeO 3 and SrCeO 3 ), established proton trapping as one of the vital issues noticed recently in diverse PCs as a result of the defect cluster formation affecting the chemistry of neighboring oxygen ions. Among differing high-temperature PCs, an oxygen vacancy within the B−O 6 octahedra assists proton mobility and meanwhile does the work of a trapping site owing to the altered basicity of oxygen ions closer to the dopant along with the dopant-vacancy interaction.…”

Section: Proton Trapping In Baceomentioning

confidence: 99%

Factors Constituting Proton Trapping in BaCeO₃ and BaZrO₃ Perovskite Proton Conductors in Fuel Cell Technology: A Review

2022

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Urbanization with increasing demand for energy at a rapid pace has prompted researchers to explore effective and efficient energy storage technology. Fuel cells, being well-known among other existing devices, are categorized based on the nature of the electrolyte employed. In several areas, proton conduction solid oxide fuel cells have surpassed conventional solid oxide fuel cells. Nonetheless, there still prevail drawbacks accompanied with the proton-conducting electrolyte materials. However, the disadvantages associated with proton-conducting electrolytic materials persists. Besides chemical stability, one of the significant concerns is the fluctuation in proton conductivity among acceptor-doped compositions. Recent introspection interprets the proton trapping effect in the vicinity of the substituent attenuating proton mobility, the fundamentals of which point toward a proton-dopant complex interaction and altering basicity of the dopant neighboring oxygen atoms, escalating the activation energy. This implies a pronounced affinity of proton-trapped sites in the close coordination of the acceptor dopant while implying trap-free sites elsewhere. In the following review article, we direct our attention to the assimilation of factors responsible for the genesis of proton trapping sites with an additional motive to explore the optimal composition while achieving maximum productivity.

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Thermodesorption study of barium and strontium cerates

Cited by 11 publications

References 1 publication

Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides

Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides

Technological Challenges and Advancement in Proton Conductors: A Review

Factors Constituting Proton Trapping in BaCeO₃ and BaZrO₃ Perovskite Proton Conductors in Fuel Cell Technology: A Review

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Thermodesorption study of barium and strontium cerates

Cited by 11 publications

References 1 publication

Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides

Water Uptake and Transport Properties of La1−xCaxScO3−α Proton-Conducting Oxides

Technological Challenges and Advancement in Proton Conductors: A Review

Factors Constituting Proton Trapping in BaCeO3 and BaZrO3 Perovskite Proton Conductors in Fuel Cell Technology: A Review

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Factors Constituting Proton Trapping in BaCeO₃ and BaZrO₃ Perovskite Proton Conductors in Fuel Cell Technology: A Review