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<p>A two-step coprecipitation method was used to synthesize core–shell structured BaCe<sub>0.9</sub>Y<sub>0.1</sub>O<sub>2.95±δ</sub>(BCY)@Ce<sub>0.9</sub>Y<sub>0.1</sub>O<sub>1.95±δ</sub>(YDC) powders, and the corresponding BCY@YDC ceramics were prepared by sintering at 1600&#xa0;°C for 10&#xa0;h under an air atmosphere. XRD, SEM, and TEM analyses show that the molar ratio of BCY to YDC in BCY@YDC ceramics prepared from core–shell powders is 1: 1, and the phase distribution is uniform. Under a dry air atmosphere at 700&#xa0;°C, the BCY@YDC ceramic achieves an electrical conductivity of 1.2 × 10<sup>–2</sup>&#xa0;S/cm, which is 1.3 and 1.8 times that of the mechanically mixed BCY-YDC counterpart and the single-phase YDC, respectively. Concurrently, the specific grain boundary electrical conductivity of the BCY@YDC ceramic in a dry air atmosphere is 1.3 times and 31.4 times that of BCY-YDC and YDC, respectively. This further demonstrates that this unique phase distribution, inherited from the core–shell powders, effectively enhances the electrical conductivity of CeO<sub>2</sub>-based composite electrolytes.</p>

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Fabrication and electrical conductivity of BaCe0.9Y0.1O2.95±δ@Ce0.9Y0.1O1.95±δ ceramics sintered from corresponding core–shell powders

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Congcong Fang,
  • Bin Meng,
  • Qingqing Yang,
  • Peng Liu,
  • Shuo Wang,
  • Hao Wang,
  • Beier Wang

摘要

A two-step coprecipitation method was used to synthesize core–shell structured BaCe0.9Y0.1O2.95±δ(BCY)@Ce0.9Y0.1O1.95±δ(YDC) powders, and the corresponding BCY@YDC ceramics were prepared by sintering at 1600 °C for 10 h under an air atmosphere. XRD, SEM, and TEM analyses show that the molar ratio of BCY to YDC in BCY@YDC ceramics prepared from core–shell powders is 1: 1, and the phase distribution is uniform. Under a dry air atmosphere at 700 °C, the BCY@YDC ceramic achieves an electrical conductivity of 1.2 × 10–2 S/cm, which is 1.3 and 1.8 times that of the mechanically mixed BCY-YDC counterpart and the single-phase YDC, respectively. Concurrently, the specific grain boundary electrical conductivity of the BCY@YDC ceramic in a dry air atmosphere is 1.3 times and 31.4 times that of BCY-YDC and YDC, respectively. This further demonstrates that this unique phase distribution, inherited from the core–shell powders, effectively enhances the electrical conductivity of CeO2-based composite electrolytes.