Ti-doped SrFeO3 nanostructured electrodes for symmetric solid oxide fuel cells

摘要

Nanostructured electrodes of Sr0.98Fe1-xTixO3-delta are evaluated as both cathode and anode for solid oxide fuel cells. The electrodes are prepared by a low-cost and simple procedure based on spray-pyrolysis deposition on a porous Ce0.8Gd0.2O1.9 (CGO) layer. A homogenous coating layer of electrode catalyst nanoparticles is formed on the CGO backbone surface in a single deposition-firing step. Sr0.98Fe0.8Ti0.2O3-delta (SFT0.2) exhibits high efficiency operating as both cathode and anode with polarization resistance values of 0.1 Omega cm(2) in air and 0.07 Omega cm(2) in humidified H-2 at 700 degrees C. An electrolyte supported cell with 300 mm thick La0.9Sr0.1Ga0.8Mg0.2O3-delta electrolyte and SFT0.2 symmetric electrodes shows maximum power densities of 700 and 140 mW cm(-2) at 800 and 600 degrees C, respectively.