Fundamental and technological aspects of thermochemical expansion of proton-conducting oxides: a case study of BaSn1−xScxO3−δ

Starostin, G. N.; Tsvetkov, D. S.; Starostina, I. A.; Sereda, V. V.; Akopian, M. T.; Malyshkin, D. A.; Ivanov, I. L.; Murashkina, A. A.; Zuev, A. Yu; Medvedev, D. A.

doi:10.1039/d4ta02402h

J. Mater. Chem. A

2024

DOI: 10.1039/d4ta02402h

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Fundamental and technological aspects of thermochemical expansion of proton-conducting oxides: a case study of BaSn_1−xSc_xO_3−δ

G. N. Starostin,

D. S. Tsvetkov,

I. A. Starostina

et al.

Abstract: Proton-conducting electrolytes (PCEs) are extensively researched materials for their use in solid oxide electrochemical cells with various operating principles. The high ionic (protonic) transport of PCEs offers superior performance of...

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Cited by 2 publications

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Insights into Barriers to Increasing Proton Conductivity of Lanthanum Scandate Ceramics via High Sr-Doping

Lesnichyova,

Belyakov,

Petrova

et al. 2024

ACS Appl. Energy Mater.

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Maximizing proton conductivity is a necessity in the design of efficient oxide proton-conductive membranes for electrochemical applications. Acceptor doping makes it possible to achieve a high concentration of charge carriers but encounters problems of phase stability or defect interaction. Sr is the optimal dopant for perovskite-like lanthanum scandate. La1–x Sr x ScO3−δ (0.05 ≤ x ≤ 0.20) solid solutions demonstrate phase and structural stability and high levels of hydration. Compositions with x = 0.1 and 0.15 reach proton conductivity of 5 mS/cm at 600 °C and air humidity 2.8 kPa; however, for compositions x ≥ 0.15, an increase in temperature above 500 °C causes a drastic loss of protons. It is probably associated with the clustering of oxygen vacancies, which is confirmed by an anomalous increase in the thermodynamic parameters of hydration, chemical expansion values, and activation energies of proton and oxide-ion transfer. Thus, both high proton transfer activation energies and chemical expansion values for compositions x ≥ 0.15 can become a challenge in the production and operation of electrolytic membranes, whereas compositions x ∼ 0.1 are most preferred.

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Insights into Barriers to Increasing Proton Conductivity of Lanthanum Scandate Ceramics via High Sr-Doping

Lesnichyova,

Belyakov,

Petrova

et al. 2024

ACS Appl. Energy Mater.

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Technological achievements in the fabrication of tubular-designed protonic ceramic electrochemical cells

Gordeeva,

Tarutin,

Danilov

et al. 2024

Mater. Futures

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Protonic ceramic electrochemical cells provide an excellent basis for the advancement of high-temperature solid oxide devices, offering potential solutions to a range of challenges in the hydrogen energy and carbon capture fields. The facilitated ionic transport in proton-conducting electrolytes enables these cells to operate at temperatures 100 °C–500 °C lower than those of conventional solid oxide cells with known zirconia electrolytes. As a result, promising performances have been reported for various types of proton ceramic electrochemical cells. Nevertheless, these advancements have been demonstrated only at the laboratory scale, whereas their ZrO2-based counterparts have already been commercialized. This review presents an overview of the fundamental and applied aspects related to the fabrication of tubular protonic ceramic electrochemical cells and their subsequent characterization as hydrogen permeation membranes, hydrogen pumps, hydrogen sensors, fuel cells, electrolysis cells, and electrochemical reactors. A specific focus is placed on the technological aspects of the tube preparations derived from the original powder sources as well as the dimensional characteristics of the tubes, which serve as an indicator of scaling. Therefore, this review serves as a starting point for the development and scaling of protonic ceramic electrochemical cells, with the potential for large-scale production.

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Fundamental and technological aspects of thermochemical expansion of proton-conducting oxides: a case study of BaSn_1−xSc_xO_3−δ

Abstract: Proton-conducting electrolytes (PCEs) are extensively researched materials for their use in solid oxide electrochemical cells with various operating principles. The high ionic (protonic) transport of PCEs offers superior performance of...

Cited by 2 publications

References 58 publications

Insights into Barriers to Increasing Proton Conductivity of Lanthanum Scandate Ceramics via High Sr-Doping

Insights into Barriers to Increasing Proton Conductivity of Lanthanum Scandate Ceramics via High Sr-Doping

Technological achievements in the fabrication of tubular-designed protonic ceramic electrochemical cells

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