Strontium doping effect on phase homogeneity and conductivity of Ba 1-xSrxCe0.6Zr0.2Y 0.2O3-δ proton-conducting oxides

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Title:	Strontium doping effect on phase homogeneity and conductivity of Ba 1-xSrxCe0.6Zr0.2Y 0.2O3-δ proton-conducting oxides
Authors:	李侃融;Lee, Kan-Rong;Tseng, Chung-Jen;Chang, Jeng-Kuei;Hung, I-Ming;Lin, Jing-Chie;Lee, Sheng-Wei
Contributors:	工學院機械工程學系
Keywords:	Alternative fuels. Production and utilization;Applied sciences;Ba1−xSrxCe0.6Zr0.2Y0.2O3−δ;Chemical stability;Energy;Exact sciences and technology;Fuels;Hydrogen;Ionic conductivity;Proton-conducting electrolyte;Solid oxide fuel cells
Date:	2013-08-21
Issue Date:	2026-04-23 15:28:26 (UTC+8)
Publisher:	Elsevier Ltd.;Kidlington: Elsevier Ltd
Abstract:	摘要： Ba1−xSrxCe0.6Zr0.2Y0.2O3−δ (0.0 ≤ x ≤ 1.0) proton-conducting oxides have been prepared using a citrate-EDTA complexing sol–gel method. In this study, the relationship between the Sr doping content and microstructure, chemical stability against CO2, and conductivity of the sintered Ba1−xSrxCe0.6Zr0.2Y0.2O3−δ pallets are systematically investigated using XRD, SEM, micro-Raman spectroscopy, and dc two-probe measurements. All sintered Ba1−xSrxCe0.6Zr0.2Y0.2O3−δ oxides exhibit excellent chemical stability after being exposed to the CO2 ambient at 600 °C for a long duration; nevertheless, their microstructures and conductivities are very sensitive to the Sr doping amount. The Sr incorporation is found to apparently suppress the formation of CeO2-like second phase, and enhance the grain growth in sintered oxides. Among all sintered samples, the Ba0.8Sr0.2Ce0.6Zr0.2Y0.2O3−δ pallet has the highest conductivity, 0.009 S/cm at 800 °C. This result can be attributed to the competition between the elimination of CeO2- or (Zr,Ce,Y)O2-like phase inhomogeneity and enhanced grain growth in sintered oxides, both of which adversely influence the ionic conductivity. This work demonstrates that Ba1−xSrxCe0.6Zr0.2Y0.2O3−δ would be a promising electrolyte for H+-SOFC applications if the Sr doping is well controlled. ► Ba1−xSrxCe0.6Zr0.2Y0.2O3−δ was prepared by citrate-EDTA complexing sol–gel method. ► The Sr addition apparently eliminate CeO2-like phase, and enhanced grain growth. ► All sintered oxides exhibit excellent chemical stability against CO2 ambient. ► The Ba0.8Sr0.2Ce0.6Zr0.2Y0.2O3−δ pallet has the conductivity, 0.009 S/cm at 800 °C ► It is a result of the compromise between phase inhomogeneity and grain growth. 出版者： Kidlington: Elsevier Ltd 出版日期： 2013-08-21 出處： International journal of hydrogen energy, 2013-08, Vol.38 (25), p.11097-11103 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2013 Hydrogen Energy Publications, LLC. 版權： 2014 INIST-CNRS 識別號： ISSN: 0360-3199 識別號： EISSN: 1879-3487 識別號： DOI: 10.1016/j.ijhydene.2013.01.043 識別號： CODEN: IJHEDX
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