Scholarlink

<p>The extensive application of the electrolyte for solid oxide fuel cells (SOFCs) at intermediate temperatures (IT) is limited mainly owing to low conductivity. The effects of the Yb<sub>2</sub>O<sub>3</sub> content on the phase stability,&#xa0;microstructure and ionic conductivity of the Yb<sub>2</sub>O<sub>3</sub> and Sc<sub>2</sub>O<sub>3</sub> co-doped ZrO<sub>2</sub> (YbScSZ) ceramic electrolyte synthesized by the sol–gel-hydrothermal and calcination methods were investigated through X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS) in this paper. The results show that the 3Yb<sub>2</sub>O<sub>3</sub>–8Sc<sub>2</sub>O<sub>3</sub>–89ZrO<sub>2</sub> (mol%, 3Yb8ScSZ) exhibits a density of 5.80 g cm<sup>−3</sup>, an activation energy of 0.578 eV, and an ionic conductivity of 1.02 × 10<sup>−1</sup> S cm<sup>−1</sup> at 800 ℃. It is attributed to the good phase stability and high density of the cubic Yb<sub>2</sub>O<sub>3</sub> and Sc<sub>2</sub>O<sub>3</sub> co-doped ZrO<sub>2</sub>, and the low activation energy. Certain Yb<sup>3+</sup> replacements for Sc<sup>3+</sup> can increase the grain size and uniformity without reducing the oxygen vacancy density, which is beneficial for enhancing ionic conduction.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The effect of Yb2O3 content on the phase stability, microstructure, and conductivity of YbScSZ electrolyte at intermediate temperatures

  • 期刊论文

  • 发表日期：

    2025年9月18日

查看全文
  • Weiqi Li,
  • Jintao Ma,
  • Fanjun Tang,
  • Huan He,
  • Tianquan Liang

摘要

The extensive application of the electrolyte for solid oxide fuel cells (SOFCs) at intermediate temperatures (IT) is limited mainly owing to low conductivity. The effects of the Yb2O3 content on the phase stability, microstructure and ionic conductivity of the Yb2O3 and Sc2O3 co-doped ZrO2 (YbScSZ) ceramic electrolyte synthesized by the sol–gel-hydrothermal and calcination methods were investigated through X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS) in this paper. The results show that the 3Yb2O3–8Sc2O3–89ZrO2 (mol%, 3Yb8ScSZ) exhibits a density of 5.80 g cm−3, an activation energy of 0.578 eV, and an ionic conductivity of 1.02 × 10−1 S cm−1 at 800 ℃. It is attributed to the good phase stability and high density of the cubic Yb2O3 and Sc2O3 co-doped ZrO2, and the low activation energy. Certain Yb3+ replacements for Sc3+ can increase the grain size and uniformity without reducing the oxygen vacancy density, which is beneficial for enhancing ionic conduction.