Maintaining pronounced proton transportation of solid oxides prepared with a sintering additive

Mineev, Alexey; Zvonareva, Inna A.; Medvedev, Dmitry; Shao, Zongping

doi:10.1039/d1ta03399a

Cited by 14 publications

(14 citation statements)

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“…It should be mentioned that the addition of 0.5 wt% CuO has no significant effect on the cell parameters, as we have previously shown in the article. 40 In general, the bulk transport properties of electrolytes depend on the impurity type introduced, in particular, its ionic radius and charge state. According to this view, the structural parameters upon Zr-to-Sn substitution should not have a significant effect on the transport properties of the ceramic materials.…”

Section: Structural Characterization Of Bzssmentioning

confidence: 99%

Enhanced transport properties of Sn‐substituted proton‐conducting BaZr_0.8Sc_0.2O_3–δ ceramic materials

et al. 2021

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High-temperature proton conductors based on acceptor-doped barium zirconate exhibit excellent chemical stability in atmospheres containing CO 2 or H 2 O. However, due to their refractory nature, these conductors have a low grain growth rate, which negatively affects the overall electrical conductivity. A possible strategy for increasing the ionic conductivity of zirconates lies in the partial substitution of Zr-ions with other isovalent dopants. In this work, we carried out systematic studies of the crystal structure, microstructure, hydration capacity, transport, and thermal properties of BaZr 0.8-x Sn x Sc 0.2 O 3-δ (x = 0, 0.1, and 0.2).According to X-ray powder diffraction and scanning electron microscopy data, all studied ceramic samples have a cubic perovskite structure, whose average grain size decreases with tin doping. It is found that the composition with x = 0.1 exhibits the highest values in terms of total, ionic, grain, and grain-boundary conductivities. The complex analysis of the obtained data shows that a low-level substitution of Zr 4+ -with Sn 4+ -ions is a competent approach for designing new proton-conducting electrolytes attractive for high-temperature applications.

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Section: Structural Characterization Of Bzssmentioning

confidence: 99%

Enhanced transport properties of Sn‐substituted proton‐conducting BaZr_0.8Sc_0.2O_3–δ ceramic materials

et al. 2021

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“…The effect of this type of sintering additive on the low-temperature transport properties of barium stannates was previously studied by Mineev et al [34], who confirmed that the introduction of 0.5 wt% CuO results in the point distribution of a Cu-based phase along the grain boundaries. Although the volume concentration of this phase did not exceed 3%, this turned out to be sufficient for the formation of free (or incompletely covered with CuO) grain boundaries (Fig.…”

Section: Microstructural Featuresmentioning

confidence: 68%

“…The main theme of this work is the evaluation of transport properties of the Sc-doped BaSnO 3 materials at high temperatures. Previously, the bulk and grainboundary conductivities were thoroughly studied for a similar system by the alternating current (AC) impedance spectroscopy [34]. It was found that at temperatures above 350 ℃, the total σ of stannates is determined by the bulk component.…”

Section: Transport Propertiesmentioning

confidence: 99%

High-temperature transport properties of BaSn1−xScxO3−δ ceramic materials as promising electrolytes for protonic ceramic fuel cells

et al. 2022

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Protonic ceramic fuel cells (PCFCs) offer a convenient means for electrochemical conversion of chemical energy into electricity at intermediate temperatures with very high efficiency. Although BaCeO3- and BaZrO3-based complex oxides have been positioned as the most promising PCFC electrolytes, the design of new protonic conductors with improved properties is of paramount importance. Within the present work, we studied transport properties of scandium-doped barium stannate (Sc-doped BaSnO3). Our analysis included the fabrication of porous and dense BaSn1−xScxO3−δ ceramic materials (0 ⩽ x ⩽ 0.37), as well as a comprehensive analysis of their total, ionic, and electronic conductivities across all the experimental conditions realized under the PCFC operation: both air and hydrogen atmospheres with various water vapor partial pressures (p(H2O)), and a temperature range of 500–900 °C. This work reports on electrolyte domain boundaries of the undoped and doped BaSnO3 for the first time, revealing that pure BaSnO3 exhibits mixed ionic-electronic conduction behavior under both oxidizing and reducing conditions, while the Sc-doping results in the gradual improvement of ionic (including protonic) conductivity, extending the electrolyte domain boundaries towards reduced atmospheres. This latter property makes the heavily-doped BaSnO3 representatives attractive for PCFC applications.

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“…The remaining parts of the low-frequency stand for the electrode process and no elaborate split. 12 However, the acquisition of conductivity is not affected. In Figure 3b, the first semicircle of BCSDCu is determined as a grain-boundary process based on the characteristic capacitance (2.73 × 10 −8 F), frequency (9.78 × 10 2 Hz), and the DRT peak locations.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Sn–Dy–Cu Triply Doped BaZr_0.1Ce_0.7Y_0.2O_3−δ: A Chemically Stable and Highly Proton-Conductive Electrolyte for Low-Temperature Solid Oxide Fuel Cells

Guo

Guan

et al. 2022

ACS Sustainable Chem. Eng.

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BaCeO 3 -based proton conductors have comparatively high-proton conductivity, but the low chemical stability and high sintering temperature seriously hinder their practical applications in protonic ceramic fuel cells. Herein, we demonstrate that this limitation can be conciliated by using a triple-doping strategy in a BaZr 0.1 Ce 0.7 Y 0.2 O 3−δ (BZCY) electrolyte, where the triply doped BaCe 0.7 Sn 0.1 Dy 0.15 Cu 0.05 O 3−δ (BCSDCu) exhibits better chemical stability and conductivity and lower sintering temperature compared with the pristine BZCY. The phase-pure BCSDCu can be obtained at the sintering temperature of 1100 °C prepared by solid-state reaction. The dense BCSDCu (>95%) is achieved at 1350 °C, which is significantly lower than the 1550 °C of BZCY. The BCSDCu presents competitive proton conductivity of 13.6 mS cm −1 under a moist H 2 atmosphere at 600 °C. The anode-supported single cell with the BCSDCu (≈40 μm) as the electrolyte reaches the highest power density of 390 mW cm −2 at 600 °C. On the basis of the distribution of relaxation time analysis, we not only distinguish the contribution of grain and grain-boundary conductivities but also identify the rate-determining step of the single-cell performance. The protonic conductivities, mechanical properties, and impurity clean parts induced by grain size effects are discussed for the BCSDCu proton conductor.

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Maintaining pronounced proton transportation of solid oxides prepared with a sintering additive

Abstract: Proton-conducting electrolytes (PCEs) have led to significant advances in the fields of solid-state ionics, energy conversion and high-temperature electrochemistry, providing the basis of various solid oxide devices that demonstrate outstanding...

Cited by 14 publications

References 82 publications

Enhanced transport properties of Sn‐substituted proton‐conducting BaZr_0.8Sc_0.2O_3–δ ceramic materials

Enhanced transport properties of Sn‐substituted proton‐conducting BaZr_0.8Sc_0.2O_3–δ ceramic materials

High-temperature transport properties of BaSn1−xScxO3−δ ceramic materials as promising electrolytes for protonic ceramic fuel cells

Sn–Dy–Cu Triply Doped BaZr_0.1Ce_0.7Y_0.2O_3−δ: A Chemically Stable and Highly Proton-Conductive Electrolyte for Low-Temperature Solid Oxide Fuel Cells

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Maintaining pronounced proton transportation of solid oxides prepared with a sintering additive

Abstract: Proton-conducting electrolytes (PCEs) have led to significant advances in the fields of solid-state ionics, energy conversion and high-temperature electrochemistry, providing the basis of various solid oxide devices that demonstrate outstanding...

Cited by 14 publications

References 82 publications

Enhanced transport properties of Sn‐substituted proton‐conducting BaZr0.8Sc0.2O3–δ ceramic materials

Enhanced transport properties of Sn‐substituted proton‐conducting BaZr0.8Sc0.2O3–δ ceramic materials

High-temperature transport properties of BaSn1−xScxO3−δ ceramic materials as promising electrolytes for protonic ceramic fuel cells

Sn–Dy–Cu Triply Doped BaZr0.1Ce0.7Y0.2O3−δ: A Chemically Stable and Highly Proton-Conductive Electrolyte for Low-Temperature Solid Oxide Fuel Cells

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Enhanced transport properties of Sn‐substituted proton‐conducting BaZr_0.8Sc_0.2O_3–δ ceramic materials

Enhanced transport properties of Sn‐substituted proton‐conducting BaZr_0.8Sc_0.2O_3–δ ceramic materials

Sn–Dy–Cu Triply Doped BaZr_0.1Ce_0.7Y_0.2O_3−δ: A Chemically Stable and Highly Proton-Conductive Electrolyte for Low-Temperature Solid Oxide Fuel Cells