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<p>To address the low conductivity of yttrium-doped BaZrO<sub>3</sub> (BZY) proton-conducting electrolytes, this study synthesized Sm-doped BaZr<sub>0.8</sub>Y<sub>0.2−<i>x</i></sub>Sm<sub><i>x</i></sub>O<sub>3−δ</sub> (<i>x</i> = 0–0.15) via sol–gel, systematically investigating the effects of Sm doping on the structural, morphological, and electrochemical properties. Key findings reveal that optimal Sm doping (<i>x</i> = 0.05) produces homogeneous grains (relative density: 97.39%), reduces lattice parameters (4.208&#xa0;Å), and enhances conductivity to 12.4 × 1&#xa0;0<sup>−3</sup> S cm<sup>−1</sup> at 650°C, which is 63% higher than that of undoped BZY (7.6 × 10<sup>−3</sup> S cm<sup>−1</sup>). The anode-supported SOEC based on BaZr<sub>0.8</sub>Y<sub>0.2−<i>x</i></sub>Sm<sub><i>x</i></sub>O<sub>3−δ</sub> (<i>x</i> = 0.05) prepared by the co-pressing method shows good performance at low temperatures: the electrolytic current reaches up to 0.31 A cm<sup>−2</sup> at 650°C and a voltage of 1.5&#xa0;V (34.8% higher than undoped cells), and a hydrogen production rate of 129.58&#xa0;mL&#xa0;cm<sup>−2</sup>&#xa0;h<sup>−1</sup>. This work demonstrates that controlled Sm doping in BZY significantly boosts ionic transport and SOEC efficiency at 650°C, providing a viable strategy for next-generation proton-conducting electrochemical devices.</p>

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Study of High-Performance Solid Oxide Electrolytic Cell Based on BaZr0.8Y0.2−xSmxO3−δ Proton Conductor Electrolyte

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Yongtao Huang,
  • Jie Zheng,
  • Ying Li,
  • Zezhong Wang

摘要

To address the low conductivity of yttrium-doped BaZrO3 (BZY) proton-conducting electrolytes, this study synthesized Sm-doped BaZr0.8Y0.2−xSmxO3−δ (x = 0–0.15) via sol–gel, systematically investigating the effects of Sm doping on the structural, morphological, and electrochemical properties. Key findings reveal that optimal Sm doping (x = 0.05) produces homogeneous grains (relative density: 97.39%), reduces lattice parameters (4.208 Å), and enhances conductivity to 12.4 × 1 0−3 S cm−1 at 650°C, which is 63% higher than that of undoped BZY (7.6 × 10−3 S cm−1). The anode-supported SOEC based on BaZr0.8Y0.2−xSmxO3−δ (x = 0.05) prepared by the co-pressing method shows good performance at low temperatures: the electrolytic current reaches up to 0.31 A cm−2 at 650°C and a voltage of 1.5 V (34.8% higher than undoped cells), and a hydrogen production rate of 129.58 mL cm−2 h−1. This work demonstrates that controlled Sm doping in BZY significantly boosts ionic transport and SOEC efficiency at 650°C, providing a viable strategy for next-generation proton-conducting electrochemical devices.