Department of Electronic and Engineering, Nanjing Vocational Institute of Mechatronic Technology, Nanjing 211306, P. R. China.
Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology/Energy Storage Joint Research Center, School of Energy and Environment, Southeast University, Nanjing 210096, China.
Chem Commun (Camb). 2023 May 18;59(41):6223-6226. doi: 10.1039/d2cc06904k.
High-performing electrolytes at low operating temperatures have become an inevitable trend in the development of low-temperature solid oxide fuel cells (LT-SOFCs). Such electrolytes have drawn significant attention due to their appeal for high performance. Herein, we propose a new material by doping Y into GdO for LT-SOFC electrolyte use. The prepared material was characterized in terms of crystal structure, surface, and interface properties, followed by its application in LT-SOFCs. YDG delivered promising SOFC performance with a power density of 1046 mW cm at 550 °C along with high ionic conductivity of 0.19 S cm. Moreover, impedance spectra revealed that YDG exhibited the least ohmic resistance of 0.06-0.09 Ω cm at 550-460 °C. Furthermore, stable operation for 60 h demonstrated the chemical stability of the material in reduced temperature environments. Density function theory was also applied to analyze the electronic band structure and density of states of the synthesized sample. Our findings thus certify that YDG as a high-performing electrolyte at low operating temperatures.
在低温下具有高性能的电解质已经成为低温固体氧化物燃料电池（LT-SOFC）发展的必然趋势。由于其高性能的吸引力，此类电解质引起了人们的极大关注。在此，我们提出了一种通过在 GdO 中掺杂 Y 来用于 LT-SOFC 电解质的新材料。对所制备的材料进行了晶体结构、表面和界面特性的表征，然后将其应用于 LT-SOFC 中。YDG 在 550°C 时表现出了有前途的 SOFC 性能，功率密度为 1046 mW cm，同时具有 0.19 S cm 的高离子电导率。此外，阻抗谱表明 YDG 在 550-460°C 时表现出最小的欧姆电阻为 0.06-0.09 Ω cm。此外，经过 60 h 的稳定运行，证明了材料在降低温度环境下的化学稳定性。还应用密度泛函理论分析了合成样品的电子能带结构和态密度。我们的研究结果证实了 YDG 作为一种在低温下具有高性能的电解质。
