Solid Oxide Energy Device (SOED)

Anomalies of Au film formed on the pentacene surface are investigated as a counterpart of pentacene/Au structure. The Au film is found to contain pentacene derivatives originated from the pentacene layers, and it is composed of grains of various sizes formed as the Au thickness increases. The authors suggest that it is this abundance of peculiarities of the Au film that accounts for the attenuated density of states in the valence band. Deformation of Au grains is accompanied by the lift of the pentacene layers, which, in turn, brings about the device failure.

We are developing 1 kW class solid oxide fuel cell (SOFC) system for residential power generation (RPG) application supported by Korean Government. Anode-supported single cells with thin electrolyte layer of YSZ (yttria-stabilized zirconia) or ScSZ (scandia-stabilized zirconia) for intermediate temperature operation (650–750 ◦C), respectively, were fabricated and small stacks were built and evaluated. The LSCF/ScSZ/Ni-YSZ single cell showed performance of 543mWcm−2 at 650 ◦C and 1680mWcm−2 at 750 ◦C. The voltage of 15-cell stack based on 5 cm×5 cm single cell (LSM/YSZ/Ni-YSZ) at 150mW was 12.5V in hydrogen as fuel of 120 sccm per cell at 750 ◦C and decreased to about 10.9V at 500 h operation time. A 5-cell stack based on the LSCF/YSZ/FL/Ni-YSZ showed the maximum power density of 30W, 25W and 20W at 750 ◦C, 700 ◦C and 650 ◦C, respectively. LSCF/ScSZ/Ni-YSZ-based stack showed better performance than LSCF/YSZ/Ni-YSZ stack from the experiment temperature range. I–V characteristics by using hydrogen gas and reformate gas of methane as fuel were investigated at 750 ◦C in LSCF/ScSZ/FL/Ni-YSZ-based 5-cell stack.