Advance fuel cells using Al2O3-nNaAlO(2) composite as ion-conducting membrane

作者：Wang, Baoyuan; Chen, Shuisong; Dong, Wenjing; Wang, Xunying; Shen, Liangping^*; Wang, Hao^*

来源：International Journal of Hydrogen Energy, 2018, 43(28): 12847-12855.

DOI：10.1016/j.ijhydene.2018.04.149

• Ionic conductivity
• Solid oxide fuel cells
• Aluminium oxide
• Oxide-salt composite

In present work, we reported an novel oxide-salt Al2O3-NaAlO2 composite, which was prepared by mixing Al2O3 and Na2CO3 two phase materials in different weight ratio, and then sintering at 1100 degrees C. The X-ray diffraction pattern, scanning-electron microscope and impedance spectra are applied to characterize the crystal structure, morphology and electrical properties of the Al2O3-NaAlO2 composite. The Al2O3-NaAlO2 composite as electrolyte membrane was sandwiched by two pieces of Ni0.8Co0.15Al0.05Li-oxide (NCAL) electrode layer to construct advanced fuel cell. Optimizing the weight ratio of Al2O3 and NaAlO2, such cell delivered an highest power density of 789 mW/cm(2) and an open circuit voltage (V-oc) of 1.13 V at 575 degrees C. The superior performance is mainly due to the excellent ion-conducting of Al2O3-NaAlO2 composites and the outstanding catalysis activity of the NCAL eletrodes. The EIS results revealed that the Al2O3-NaAlO2 composite possessed superior ionic conductivity of 0.121 S/cm at 575 degrees C. The interfacial effects between oxide-salt two phase including space-charge and structural misfit at the interface region dominated the ion transport for Al2O3-NaAlO2 composite.

• 出版日期2018-7-12
• 单位湖北大学