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 4 publications

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Recent Advances and Challenges in Perovskite‐Based Protonic Ceramic Electrolytes: Design Strategies and Fabrication Innovations

Nie,

Liu,

Xiao

et al. 2024

Adv Funct Materials

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Protonic ceramic electrochemical cells (PCECs) have received extensive research attention as full solid‐state, electrochemical devices that can interconvert electrical and chemical energies via rapid proton conduction at reduced temperatures. Nonetheless, the practical application of PCECs still faces numerous challenges. In addition to the development of electrode materials, the protonic ceramic electrolytes (PCEs), which are crucial for the performance and stability of PCECs, encounter issues such as poor sinterability, low ionic conductivity, and inadequate thermochemical matching. To address these obstacles, the design and optimization of protonic ceramic electrolytes have recently become essential research focuses in the field of PCECs. To achieve effective customization of the elemental composition, crystal structure, defect structure, ionic conductivity, and chemical stability, many candidates for electrolyte materials with various compositions have been proposed. This review also covers state‐of‐the‐art developments in PCE fabrication technologies, including powder synthesis, thin‐film deposition, more controllable sintering processes and interface treatments for structural integrity and ionic conductivity. This review comprehensively summarizes the most recent design approaches and optimization strategies for perovskite‐based protonic ceramic electrolyte materials and is crucial for advancing the commercialization of PCECs.

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Recent Advances and Challenges in Perovskite‐Based Protonic Ceramic Electrolytes: Design Strategies and Fabrication Innovations

Nie,

Liu,

Xiao

et al. 2024

Adv Funct Materials

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Phase relationships and thermal behavior of one-pot synthesized dual-phase BaCe0.5Fe0.5O3–δ composites

Tarutina,

Kuznetsova,

Skutina

et al. 2024

Ceramics International

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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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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 4 publications

References 58 publications

Recent Advances and Challenges in Perovskite‐Based Protonic Ceramic Electrolytes: Design Strategies and Fabrication Innovations

Recent Advances and Challenges in Perovskite‐Based Protonic Ceramic Electrolytes: Design Strategies and Fabrication Innovations

Phase relationships and thermal behavior of one-pot synthesized dual-phase BaCe0.5Fe0.5O3–δ composites

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

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