Kim, Gihyun Lee, Naesung Kim, Ki-Beum Kim, Byung-Kook Chang, Hyejung Song, Song-Ju Park, Jun-Young 2024-01-20T13:01:48Z 2024-01-20T13:01:48Z 2022-01-10 2013-02-06 0360-3199 https://pubs.kist.re.kr/handle/201004/128360 This article investigates the relationship between ionic conductivity and various processing methods for aliovalent-doped, ceria solid solution particles, as an intermediate temperature-solid oxide electrolyte to explain the wide range of conductivity values that have been reported. The effects of doping material and content on the ionic conductivity are investigated comprehensively in the intermediate temperature range. The chemical routes such as coprecipitation, combustion, and hydrothermal methods are chosen for the synthesis of ceria-based nanopowders, including the conventional solid-state method. The ionic conductivity for the ceria-based electrolytes depends strongly on the lattice parameter (by dopant type and content), processing parameters (particle size, sintering temperature and microstructure), and operating temperature (defect formation and transport). Among other doped-ceria systems, the Nd0.2Ce0.8O2-d electrolyte synthesized by the combustion method exhibits the highest ionic conductivity at 600 degrees C. Further, a novel composite Nd0.2Ce0.8O2-d electrolyte consisting of a combination of powders (50:50) synthesized by coprecipitation and combustion is designed. This electrolyte demonstrates an ionic conductivity two to four times higher than that of any singly processed electrolytes. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD IONIC-CONDUCTIVITY RELATIONSHIPS SPACE-CHARGE FUEL-CELL ELECTROCHEMICAL PROPERTIES HYDROTHERMAL SYNTHESIS LATTICE-PARAMETERS X-RAY POWDERS GD NANOPARTICLES Various synthesis methods of aliovalent-doped ceria and their electrical properties for intermediate temperature solid oxide electrolytes Article 10.1016/j.ijhydene.2012.11.044 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.38, no.3, pp.1571 - 1587 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 38 3 1571 1587 scie scopus 000315430600040 2-s2.0-84872319888 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article IONIC-CONDUCTIVITY RELATIONSHIPS SPACE-CHARGE FUEL-CELL ELECTROCHEMICAL PROPERTIES HYDROTHERMAL SYNTHESIS LATTICE-PARAMETERS X-RAY POWDERS GD NANOPARTICLES Intermediate temperature-solid oxide electrolytes Ceria-based materials Composite electrolytes Conductivity Ceramic processing