| 학회 |
한국재료학회 |
| 학술대회 |
2013년 봄 (05/23 ~ 05/24, 여수 엠블호텔(THE MVL)) |
| 권호 |
19권 1호 |
| 발표분야 |
C. 에너지/환경 재료(Energy and Environmental Materials) |
| 제목 |
Parametric impedance characterization of Ultrathin Electrolyte PLD Films of Micro-SOFCs |
| 초록 |
In this work an array of ion-blocking metallic Ti/Au microelectrodes with about a 200 μm diameter was applied on top of an ultrathin heterolayer of (1 μm) yttria-stabilized-zirconia/ (200 nm) gadolinium-doped-ceria (YSZ/GDC) solid electrolyte in a micro-SOFC prepared by PLD, to study the transport characteristics in the perpendicular direction relevant for fuel cell operation. Three impedance contributions with resistance values different by orders of magnitude were successfully deconvoluted which are bulk (ionic) resistance of GDC layer, bulk (ionic) resistance of YSZ layer, and mostly bulk (electronic) resistance of GDC layer. The last is the major impedance response experimentally observed and incurred by ionically blocking top electrodes. The impedance response of Hebb-Wagner electrochemical polarization can be modeled by JMLL model, a transmission line model for mixed conductors generalized by constant phase elements. CK1 model by Macdonald allowed a better distinction of bulk response of the respective electrolyte films. Modeling allowed the deconvolution of the parameter set for the evaluation of chemical diffusivity as well as electrostatic double layer capacitance. Overlapping interfacial and chemical capacitance as well as the strongly non-ideal behavior of the latter are mainly responsible for the less clearly distinguished diffusion-limited feature of the Hebb-Wagner polarization cell. |
| 저자 |
Eui-Chol Shin1, Dang-Thanh Nguyen2, Jee-Hoon Kim1, Jae-Yeon Hwang2, Ji-Won Son1, Jong-Ho Lee2, Jong-Sook Lee3
|
| 소속 |
1School of Materials Science and Engineering, 2Chonnam National Univ., 3Korea Institute of Science and Technology |
| 키워드 |
Micro-SOFCs; ultra thin electrolyte; Hebb-Wagner; impedance spectroscopy
|
| E-Mail |
|
