Solid oxide fuel cells (SOFCs) have been regarded as a promising the energy conversion device from chemical energy of fuel, because of numerous advantages, such as high energy conversion efficiency, multi fuel capability, and no emission of pollutants [1]. Co-based perovskite oxides have spotlighted. For the cathode materials of SOFCs due to low over-potential for the oxygen reduction reaction (ORR), thus resulting in high performance of SOFCs [2]. However, the large dissimilarity of thermal expansion coefficient (TEC) between Co-based perovskites and typical yttria-stabilized zirconia (YSZ) and samarium-doped ceria (SDC) electrolytes result in degrading of long-term durability of SOFCs. The TECs’ of Co-based perovskite oxides are but the general electrolyte, such as YSZ’s TEC is and, indicating a huge difference between them [3].

Meanwhile, lanthanum nickelate, La_n+1Ni_nO_3n+1, may have high thermal stability than Co-based perovskites, because the TEC of La_n+1Ni_nO_3n+1 is , similar to the YSZ electrolyte [4]. In this work, hence anode-supported cells are fabricated with SDC electrolytes, Ni-cermet anode, and lanthanum nickelate cathode. To investigate the performance and durability of cathode materials, I-V measurements and load cycling testing methods are used to check the performance and durability of cells. The electrochemical impedance spectroscopy measurements are also performed for the electrochemical analysis. In addition, various physicochemical analysis tools are used, such as SEM, TEM, and XRD as the postmortem analysis [5].

References

[1] K.T. Lee, E.D. Wachsman, Science 334 (2011) 935.

[2] E. Boehm, J.-C. Grenier, Solid State Sciences 5 (2003) 973.

[3] S. Pang, X. Xi, J. Power Sources 326 (2016) 176.

[4] R.K. Sharma, E. Djurado, J. Power Sources 325 (2016) 337.

[5] T.H Lee, J.-Y. Park. J. Power Sources 331 (2016) 495

Keywords : Solid oxide fuel cells; Lanthanum nickelate; Thermal Expansion Coefficient; Durability

* Corresponding authors: jyoung@sejong.ac.kr (J.-Y. Park)