Disagreements between space charge models and grain boundary impedance data in yttrium-substituted barium zirconate

Bondevik, Tarjei; Polfus, Jonathan M.; Norby, Truls

doi:10.1016/j.ssi.2020.115369

Cited by 15 publications

(11 citation statements)

References 41 publications

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“…The charge imbalance thus emerges as a consequence of excess proton segregation and is neutralized by subsequent depletion of protons across the negatively charged space charge region adjacent to the grain boundary core on both sides as shown in Figure 9. 204 The overall outline presents the significance of microstructure over structural and charge dynamical properties in pure and acceptor-doped PCs. The detailed analysis illustrates a direct correlation between grain and grain boundary dimensions and symmetry over fluctuations in total ionic conductivity among diverse PCs.…”

Section: Microstructural Disorder Over Perturbed Protonmentioning

confidence: 99%

“…The energetically stable protonic site along the grain boundary core imposes trapping centers due to defect segregation. The charge imbalance thus emerges as a consequence of excess proton segregation and is neutralized by subsequent depletion of protons across the negatively charged space charge region adjacent to the grain boundary core on both sides as shown in Figure …”

Section: Impact Of Acceptor Dopant On Perovskite Type Baceo3 Proton C...mentioning

confidence: 99%

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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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Section: Microstructural Disorder Over Perturbed Protonmentioning

confidence: 99%

Section: Impact Of Acceptor Dopant On Perovskite Type Baceo3 Proton C...mentioning

confidence: 99%

Technological Challenges and Advancement in Proton Conductors: A Review

Vignesh

Rout

2023

Energy Fuels

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“…The potential distribution in one half of the double Schottky barrier can be expressed as 11

\begin{equation} \varphi \left(x\right)=\varphi \left(0\right)\left(\frac{{x}^{2}}{{\lambda}^{2}}-2\frac{x}{\lambda}+1\right) \end{equation}

…”

Section: Figurementioning

confidence: 99%

“…However, the assumption concerning the same mobility for charge carriers transporting in the bulk and space charge layer was basically not justified. This argument basically has been pointed out, 11 in which, however, the equation related to the model concerning concentration difference in Ref. [10] was still adopted.…”

mentioning

confidence: 99%

Reassessment of the effect of space charge potential on the electrical conductivity of polycrystalline ceramics

Fang

Hsiang

2023

J Am Ceram Soc.

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The calculation of space charge potential, the difference of the activation energy of grain boundary and grain, and the ratio of conductivity of grain boundary and grain at different temperatures of the polycrystalline ceramics have been reappraised in the present model, in which charge carriers hopping through bulk and grain boundary barriers with different mobility are taken into account. It is evidenced that the present model is valid and more precise than previous models, and thus, it is concluded that the assumption that the mobility of charge carriers hopping through bulk and grain boundary barrier is the same made by the previous studies is unsuitable.

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“…weak electrostatic coupling. To address this limitation, a number of more complex one-dimensional models have been proposed that aim to describe space-charge behaviour under non-dilute conditions [10,[14][15][16][17][18]. These models extend the simple model described above by including additional non-ideal local or non-local defect chemical potential terms.…”

mentioning

confidence: 99%

Overscreening and Underscreening in Solid-Electrolyte Grain Boundary Space-Charge Layers

Dean,

Coles,

Saunders

et al. 2021

Preprint

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Polycrystalline solids can exhibit material properties that differ significantly from those of equivalent single-crystal samples, in part, because of a spontaneous redistribution of mobile point defects into so-called space-charge regions adjacent to grain boundaries. The general analytical form of these space-charge regions is known only in the dilute limit, where defect-defect correlations can be neglected. Using kinetic Monte Carlo simulations of a three-dimensional Coulomb lattice gas, we show that grain-boundary space-charge regions in non-dilute solid electrolytes exhibit overscreeningdamped oscillatory space-charge profiles-and underscreening-decay lengths that are longer than the corresponding Debye length and that increase with increasing defect-defect interaction strength. Overscreening and underscreening are known phenomena in concentrated liquid electrolytes, and the observation of functionally analogous behaviour in solid electrolyte space-charge regions suggests that the same underlying physics drives behaviour in both classes of systems. We therefore expect theoretical approaches developed to study non-dilute liquid electrolytes to be equally applicable to future studies of solid electrolytes.

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Disagreements between space charge models and grain boundary impedance data in yttrium-substituted barium zirconate

Cited by 15 publications

References 41 publications

Technological Challenges and Advancement in Proton Conductors: A Review

Technological Challenges and Advancement in Proton Conductors: A Review

Reassessment of the effect of space charge potential on the electrical conductivity of polycrystalline ceramics

Overscreening and Underscreening in Solid-Electrolyte Grain Boundary Space-Charge Layers

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