Electrolyte materials for protonic ceramic electrochemical cells: Main limitations and potential solutions

Kasyanova, Anna V.; Zvonareva, Inna A.; Тарасова, Н. А.; Bi, Lei; Medvedev, Dmitry; Shao, Zongping

doi:10.1016/j.matre.2022.100158

Cited by 21 publications

(16 citation statements)

References 186 publications

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“…17−24 Typical PCFC/PCEC oxygen electrode materials are perovskites with a high Ba content on the A-site and one or more redox-active transition metal ions on the B-site. More complex structures are also investigated; see, for example, 15 and refs therein. These materials typically show p-type conductivity and contain oxygen vacancies V O…”

Section: Introductionmentioning

confidence: 99%

“…This is doped with acceptors such as Y 3+ and/or Yb 3+ on the perovskite B-site to induce oxygen vacancies which can be hydrated to form protonic carriers. The composition may be further modified by partial substitution of Zr 4+ with Ce 4+ to improve sintering properties and proton conductivity ( − and refs therein). The performance of protonic ceramic cells is largely limited by the kinetics of oxygen reduction or water oxidation, that is, the reactions involving breakage or formation of the OO double bond.…”

Section: Introductionmentioning

confidence: 99%

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Interplay of Chemical, Electronic, and Structural Effects in the Triple-Conducting BaFeO₃–Ba(Zr,Y)O₃ Solid Solution

Raimondi,

Merkle,

Longo

et al. 2023

Chem. Mater.

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Triple-conducting oxides with mobile protons, oxygen vacancies, and holes are key functional materials for protonic ceramic fuel/ electrolysis cells. We comprehensively investigate the Ba(Zr,Y,Fe)O 3−δ perovskite solid solution series ranging from electrolyte to electrode-type materials depending on iron content. From thermogravimetry and impedance spectroscopy, the proton and oxygen vacancy concentrations as well as electronic and ionic conductivities are determined. X-ray spectroscopy (Fe Kedge XANES, O K-edge Raman scattering, Fe, Zr, Y K-edge EXAFS) elucidates the finer features of the electronic structure and local distortions. A low Fe content of ≤10% strongly decreases the degree of hydration, while comparably high Fe concentrations of ≥70% are required to obtain an electronic conductivity sufficient for an electrode material. The transport of ionic and electronic carriers is interrelated in a complex way and is closely linked to details of the electronic structure (strength of Fe−O hybridization) and geometrical distortions (Fe−O−Fe and Fe−O-(Zr,Y) buckling). As a result, an optimum combination of proton concentration and electronic conductivity is not obtained in the middle of the solid solution series but rather found for Fe-rich materials with 20−30% doping with oversized, redox-inactive cations. A similar behavior is also expected for related solid solutions between a large-band gap electrolyte and small-band gap redox-active perovskites.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interplay of Chemical, Electronic, and Structural Effects in the Triple-Conducting BaFeO₃–Ba(Zr,Y)O₃ Solid Solution

Raimondi,

Merkle,

Longo

et al. 2023

Chem. Mater.

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“…One of the known ways to improve the conductivity is by co-doping of cationic sublattices of complex oxides. This method has been successfully applied to well-known proton conductors such as barium cerate-zirconates [17][18][19][20][21][22] and lanthanum scandates [23][24][25][26]. At the same time, the possibility of applying this method to a new class of proton-conducting materials, such as layered perovskites AA′nBnO3n+1 [27], is currently under investigation.…”

Section: Introductionmentioning

confidence: 99%

Novel co-doped protonic conductors BaLa_1.9Sr_0.1In_1.95M_0.05O_6.925 with layered perovskite structure

et al. 2023

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Active development of electrochemical devices such as proton-conducting fuel cells and electrolyzers should ensure sustainable environmental development. An electrolyte material of a hydrogen-powered electrochemical device must satisfy a number of requirements, including high proton conductivity. Layered perovskites are a promising class of proton-conducting electrolytes. The cationic co-doping method has been successfully applied to well-known proton conductors with the classical perovskite structure ABO3. However, the data on the application of this method to layered perovskites are limited. In this work, the bilayer perovskites BaLa1.9Sr0.1In1.95M0.05O6.925 (M = Mg2+, Ca2+) were obtained and investigated for the first time. Cationic co-doping increases oxygen-ion and proton conductivity values.

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“…Protonic Ceramic Cells (PCCs) are a promising alternative to oxygen-ion conducting solid oxide cells (SOCs), offering benefits for hydrogen separation, electrolysis and fuel cell applications. They are based on a solid electrolyte, similarly to SOCs, but the main difference is the use of ceramic electrolyte materials able to conduct protons H + instead of oxide ions O2 - (1).…”

Section: Introductionmentioning

confidence: 99%

Modeling of a Single Repeating Unit for Protonic Ceramic Cell Applications

Ferrero,

Dealberti,

Anelli

et al. 2023

ECS Trans.

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Protonic Ceramic Cells (PCCs) are a promising alternative to oxygen-ion conducting solid oxide cells (SOCs), offering benefits for hydrogen separation, electrolysis and fuel cell applications. The current development stage is focusing on the scale-up of the technology to cross the gap between single cells and stacks. The design of single repeating units (SRU) is the intermediate stage of the development. This work developed a numerical model for the 3D steady-state simulations of an SRU geometry designed for a circular, anode-supported PCC. The model has been applied to the simulation of fuel cell operation and has been calibrated using experimental data from the literature. The model is able to accurately reproduce experimental results obtained at 600 °C. The simulation platform developed can be also adapted to the simulation of electrolysis operation and can be applied to the optimization of the SRU geometry.

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Electrolyte materials for protonic ceramic electrochemical cells: Main limitations and potential solutions

Cited by 21 publications

References 186 publications

Interplay of Chemical, Electronic, and Structural Effects in the Triple-Conducting BaFeO₃–Ba(Zr,Y)O₃ Solid Solution

Interplay of Chemical, Electronic, and Structural Effects in the Triple-Conducting BaFeO₃–Ba(Zr,Y)O₃ Solid Solution

Novel co-doped protonic conductors BaLa_1.9Sr_0.1In_1.95M_0.05O_6.925 with layered perovskite structure

Modeling of a Single Repeating Unit for Protonic Ceramic Cell Applications

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Electrolyte materials for protonic ceramic electrochemical cells: Main limitations and potential solutions

Cited by 21 publications

References 186 publications

Interplay of Chemical, Electronic, and Structural Effects in the Triple-Conducting BaFeO3–Ba(Zr,Y)O3 Solid Solution

Interplay of Chemical, Electronic, and Structural Effects in the Triple-Conducting BaFeO3–Ba(Zr,Y)O3 Solid Solution

Novel co-doped protonic conductors BaLa1.9Sr0.1In1.95M0.05O6.925 with layered perovskite structure

Modeling of a Single Repeating Unit for Protonic Ceramic Cell Applications

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Product

Resources

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Interplay of Chemical, Electronic, and Structural Effects in the Triple-Conducting BaFeO₃–Ba(Zr,Y)O₃ Solid Solution

Interplay of Chemical, Electronic, and Structural Effects in the Triple-Conducting BaFeO₃–Ba(Zr,Y)O₃ Solid Solution

Novel co-doped protonic conductors BaLa_1.9Sr_0.1In_1.95M_0.05O_6.925 with layered perovskite structure