Highly active nanoscale Ni - Yttria stabilized zirconia anodes for micro-solid oxide fuel cell applications

作者：Buyukaksoy Aligul; Birss Viola I^*

来源：Journal of Power Sources, 2016, 307: 449-453.

DOI：10.1016/j.jpowsour.2015.12.022

• Micro-solid oxide fuel cells
• Polymeric precursor
• Spin coating
• Ni-YSZ thin film
• Nanocomposite electrode
• Nanoscale particle size

The optimum operating temperature of micro solid oxide fuel cells (mu-SOFCs) is < 600 degrees C, which normally results in an undesirably high internal resistance. While the resistance of the electrolyte (most commonly yttria stabilized zirconia, YSZ) can be lowered significantly simply by decreasing its thickness, minimization of the electrode resistance (thus maintaining rapid reaction kinetics) is not as straightforward. In this work, an ethylene glycol based polymeric precursor solution, which promotes the intimate mixing of the Ni, Y and Zr components prior to their crystallization as oxides, was spin-coated onto a YSZ disc, generating a nanocomposite NiO-YSZ thin film. The in-situ reduction of NiO phase within the dense NiO-YSZ film to Ni, in combination with the nanoscale size of the Ni and YSZ particles (ca. 25 nm), resulted in a nanoporous, Ni-YSZ anode morphology (thickness < 1 mu m) with a homogeneous distribution of Ni and YSZ and a very high triple phase boundary length. Very small electrode polarization resistances of 0.65 Omega cm(2) per electrode were obtained at 550 degrees C in humidified H-2, the lowest values yet reported for SOFCs at this temperature. These highly active anodes are therefore very promising for use in next generation mu-SOFCs.

• 出版日期2016-3-1