Preparation, Characterization and Intermediate-Temperature Electrochemical Properties of Er<sup>3+</sup>-Doped Barium Cerate–Sulphate Composite Electrolyte
oleh: Fufang Wu, Ruifeng Du, Tianhui Hu, Hongbin Zhai, Hongtao Wang
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2019-08-01 |
Deskripsi
In this study, BaCe<sub>0.9</sub>Er<sub>0.1</sub>O<sub>3−α</sub> was synthesized by a microemulsion method. Then, a BaCe<sub>0.9</sub>Er<sub>0.1</sub>O<sub>3−α</sub>−K<sub>2</sub>SO<sub>4</sub>−BaSO<sub>4</sub> composite electrolyte was obtained by compounding it with a K<sub>2</sub>SO<sub>4</sub>−Li<sub>2</sub>SO<sub>4</sub> solid solution. BaCe<sub>0.9</sub>Er<sub>0.1</sub>O<sub>3−α</sub> and BaCe<sub>0.9</sub>Er<sub>0.1</sub>O<sub>3−α</sub>−K<sub>2</sub>SO<sub>4</sub>−BaSO<sub>4</sub> were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectrometry. AC impedance spectroscopy was measured in a nitrogen atmosphere at 400−700 °C. The logσ~log (<i>p</i><sub>O<sub>2</sub></sub>) curves and fuel cell performances of BaCe<sub>0.9</sub>Er<sub>0.1</sub>O<sub>3−α</sub> and BaCe<sub>0.9</sub>Er<sub>0.1</sub>O<sub>3−α</sub>−K<sub>2</sub>SO<sub>4</sub>−BaSO<sub>4</sub> were tested at 700 °C. The maximum output power density of BaCe<sub>0.9</sub>Er<sub>0.1</sub>O<sub>3−α</sub>−K<sub>2</sub>SO<sub>4</sub>−BaSO<sub>4</sub> was 115.9 mW·cm<sup>−2</sup> at 700 °C, which is ten times higher than that of BaCe<sub>0.9</sub>Er<sub>0.1</sub>O<sub>3−α</sub>.