TY - JOUR

T1 - Insight into Grain and Grain-Boundary Transport of Proton-Conducting Ceramics: A Case Report of BaSn0.8Y0.2O3−δ

AU - Starostina, Inna

AU - Starostin, George

AU - Akopian, Mariam

AU - Vdovin, Gennady

AU - Osinkin, Denis

AU - Py, Baptiste

AU - Maradesa, Adeleke

AU - Ciucci, Francesco

AU - Medvedev, Dmitry

N1 - Текст о финансировании #1 This work was prepared within the framework of the budgetary plans of the Hydrogen Energy Laboratory (Ural Federal University) and Institute of High Temperature Electrochemistry (IHTE) with the facilities of the IHTE Shared Access Center “Composition of Compounds”. The authors gratefully acknowledge the financial support from the Research Grants Council of Hong Kong (RGC Ref No. 16201820 and 16206019). B. Py and A. Maradesa kindly thank the Hong Kong Ph.D. Fellowship Scheme for its financial support. Текст о финансировании #2 This work was prepared within the framework of the budgetary plans of the Hydrogen Energy Laboratory (Ural Federal University) and Institute of High Temperature Electrochemistry (IHTE) with the facilities of the IHTE Shared Access Center “Composition of Compounds”. The authors gratefully acknowledge the financial support from the Research Grants Council of Hong Kong (RGC Ref No. 16201820 and 16206019). B. Py and A. Maradesa kindly thank the Hong Kong Ph.D. Fellowship Scheme for its financial support.

PY - 2024

Y1 - 2024

N2 - Proton-conducting ceramic electrolytes offer great potential for the development of low- and intermediate-temperature solid oxide electrochemical devices, e.g., fuel cells and electrolyzers. However, the electrolyte constitutes the main bottleneck in such devices, especially at reduced temperatures, determining their overall performance and efficiency. Herein, for the first time the low-temperature transport properties of BaSn0.8Y0.2O3−δ as a representative of proton-conducting materials are investigated. The attention is focussed on grain and grain boundary conductivity of this ceramic material over a wide range of experimental conditions, including temperatures of 400–550 °C, oxygen partial pressures of 10−22–0.21 atm, and water vapor partial pressures of 10−5-0.03 atm. After analyzing BaSn0.8Y0.2O3−δ with electrochemical impedance spectroscopy under these experimental conditions, the distribution of relaxation times is leveraged to evaluate the resistance, capacitance, and frequency of each electrolytic process. The data show that the BSY ceramic, prepared with CuO as a sintering additive, is characterized by three distinct processes: one is due to grain response, and two others are understood to be related to the responses of the pure and CuO-covered grain boundaries. Therefore, this work opens a new path for the analysis of ionic, including protonic, transport along grains and grain boundaries. © 2023 Wiley-VCH GmbH.

AB - Proton-conducting ceramic electrolytes offer great potential for the development of low- and intermediate-temperature solid oxide electrochemical devices, e.g., fuel cells and electrolyzers. However, the electrolyte constitutes the main bottleneck in such devices, especially at reduced temperatures, determining their overall performance and efficiency. Herein, for the first time the low-temperature transport properties of BaSn0.8Y0.2O3−δ as a representative of proton-conducting materials are investigated. The attention is focussed on grain and grain boundary conductivity of this ceramic material over a wide range of experimental conditions, including temperatures of 400–550 °C, oxygen partial pressures of 10−22–0.21 atm, and water vapor partial pressures of 10−5-0.03 atm. After analyzing BaSn0.8Y0.2O3−δ with electrochemical impedance spectroscopy under these experimental conditions, the distribution of relaxation times is leveraged to evaluate the resistance, capacitance, and frequency of each electrolytic process. The data show that the BSY ceramic, prepared with CuO as a sintering additive, is characterized by three distinct processes: one is due to grain response, and two others are understood to be related to the responses of the pure and CuO-covered grain boundaries. Therefore, this work opens a new path for the analysis of ionic, including protonic, transport along grains and grain boundaries. © 2023 Wiley-VCH GmbH.

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U2 - 10.1002/adfm.202307316

DO - 10.1002/adfm.202307316

M3 - Article

VL - 34

JO - Advanced Functional Materials

JF - Advanced Functional Materials

SN - 1616-301X

IS - 6

M1 - 2307316

ER -