Byung-Hyun Choi

Electrochemical properties related to the thickness control of the solid oxide fuel cell component layer using decalcomania paper

We fabricated anode-supported solid oxide fuel cells using decalcomania paper. To investigate the changes in thickness of the component layer and electrical properties in a unit cell, the number of layers of cathodes and the electrolyte decalcomania paper is changed. As a result, the thickness of the electrolyte and cathode layer regularly increases with an increase in the number of decalcomania papers attached. In addition, when only one electrolyte decalcomania paper is attached to an anode support, a tight and dense 8 μm electrolyte layer is obtained. A unit cell with a cathode thickness of 120 μm to which decalcomania paper is attached nine times is shown to have an open circuit voltage (OCV) of 1.08 V and a maximum power density (MPD) of 902 mW cm−2 at 800 °C.

Synthesis of octahedral-shaped NiO and approaches to an anode material of manufactured solid oxide fuel cells using the decalcomania method

Micrometer-sized and octahedral-shaped NiO particles were synthesized by microwave thermal treatment at 300 watt power for 15 min in a microwave chamber to be used as an anode material in solid oxide fuel cells. SEM image and particle size distribution revealed near-perfect octahedral NiO microparticle with sizes ranging from 4.0 ∼ 11.0 µm. The anode functional layer (AFL, 60 wt% NiO synthesized: commercial 40wt% YSZ), electrolyte (commercial Yttria-stabilized zirconia, YSZ), and cathode (commercial La0.8Sr0.2MnO3, LSM) layers were manufactured using the decalcomania method on a porous anode support, sequentially. The sintered electrolyte at 1450°C for 2 h using the decalcomania method was dense and had a thickness of about 10 µm. The cathode was sintered at 1250°C for 2 h, and it was porous. Using humidified hydrogen as a fuel, a coin cell with a 15 µmthick anode functional layer exhibited maximum power densities of 0.28, 0.38, and 0.65W/cm2 at 700, 750, and 800°C, respectively. Otherwise, when a commercial YSZ anode functional layer was used, the maximum power density was 0.55W/cm2 at 800°C.