La0.8Sr0.2Ga0.8Mg0.2O3-δ electrolyte-based symmetrical microtubular solid oxide fuel cells (SOFCs) with Sr2Fe1.5Mo0.5O6-δ electrodes were fabricated via electrophoretic deposition (EPD). Multi-layers of the anode layer, a buffer layer, a cathode layer, and an electrolyte layer were successively deposited on a graphite rod via EPD. A single cell can be obtained via a one-step co-firing processing. The stability of the slurries can be controlled by changing the amount of phosphate ester (PE), which is added as a charging agent. The electrical conductivity of the slurry increased with increasing PE, while the pH decreased. The deposition rate and thickness of the deposited layers increased with the applied voltage and deposition time. The fabricated symmetrical microtubular SOFC single cell, with the configuration of Sr2Fe1.5Mo0.5O6-δ-Ce0.9Gd0.1O1.95 (SFM-GDC) anode/ Sr2Fe1.5Mo0.5O6-δ buffer//LSGM electrolyte//Sr2Fe1.5Mo0.5O6-δ buffer/Sr2Fe1.5Mo0.5O6-δ-Ce0.9Gd0.1O1.95 (SFM-GDC) cathode, showed a maximum power density of 116 mW/cm2 at 600 oC.

Keywords: Solid oxide fuel cells, Micro tubular, Electrophoretic deposition, Slurry, Dispersant