Yb₂O₃ Doped Zr0.92Y0.08O2-α(8YSZ) and Its Composite Electrolyte for Intermediate Temperature Solid Oxide Fuel Cells

Yumin Cui; Ruijuan Shi; Junlong Liu; Hongtao Wang; Huiquan Li

doi:10.3390/ma11101824

Yb₂O₃ Doped Zr_0.92Y_0.08O_2-α(8YSZ) and Its Composite Electrolyte for Intermediate Temperature Solid Oxide Fuel Cells

Materials (Basel). 2018 Sep 25;11(10):1824. doi: 10.3390/ma11101824.

Authors

Yumin Cui¹, Ruijuan Shi², Junlong Liu³, Hongtao Wang⁴, Huiquan Li⁵

Affiliations

¹ Anhui Provincial Key Laboratory for Degradation and Monitoring of Pollution of the Environment, School of Chemical and Material Engineering, Fuyang Normal College, Fuyang 236037, China. cymlh@126.com.
² Anhui Provincial Key Laboratory for Degradation and Monitoring of Pollution of the Environment, School of Chemical and Material Engineering, Fuyang Normal College, Fuyang 236037, China. rjshi@fync.edu.cn.
³ Anhui Provincial Key Laboratory for Degradation and Monitoring of Pollution of the Environment, School of Chemical and Material Engineering, Fuyang Normal College, Fuyang 236037, China. jlliu@fync.edu.cn.
⁴ Anhui Provincial Key Laboratory for Degradation and Monitoring of Pollution of the Environment, School of Chemical and Material Engineering, Fuyang Normal College, Fuyang 236037, China. hongtaoking3@163.com.
⁵ Anhui Provincial Key Laboratory for Degradation and Monitoring of Pollution of the Environment, School of Chemical and Material Engineering, Fuyang Normal College, Fuyang 236037, China. huiquanli0908@163.com.

Abstract

Yb³⁺ and Y³⁺ double doped ZrO₂ (8YSZ+4Yb₂O₃) samples were synthesized by a solid state reaction method. Moreover, 8YSZ+4Yb₂O₃-NaCl/KCl composites were also successfully produced at different temperatures. The 8YSZ+4Yb₂O₃, 8YSZ+4Yb₂O₃-NaCl/KCl (800 °C), and 8YSZ+4Yb₂O₃-NaCl/KCl (1000 °C) samples were characterized by x⁻ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that a dense composite electrolyte was formed at a low temperature of 800 °C. The maximum conductivities of 4.7 × 10^-2 S·cm^-1, 6.1 × 10^-1 S·cm^-1, and 3.8 × 10^-1 S·cm^-1 were achieved for the 8YSZ+4Yb₂O₃, 8YSZ+4Yb₂O₃-NaCl/KCl (800 °C), and 8YSZ+4Yb₂O₃-NaCl/KCl (1000 °C) samples at 700 °C, respectively. The logσ~log (pO₂) plot result showed that the 8YSZ+4Yb₂O₃-NaCl/KCl (800 °C) composite electrolyte is a virtually pure ionic conductor. An excellent performance of the 8YSZ+4Yb₂O₃-NaCl/KCl (800 °C) composite was obtained with a maximum power density of 364 mW·cm^-2 at 700 °C.

Keywords: composite; conductivity; double doped ZrO2; electrolyte; fuel cell.