• 한국세라믹학회지
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• 제52권5호
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• pp.315-319
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• 2015

Yttria-stabilized zirconia (YSZ)-based micro tubular SOFC single cells were fabricated by electrophoretic deposition (EPD) process. Stable slurries for the EPD process were prepared by adding phosphate ester (PE) as a dispersant in order to control the pH, conductivity, and zeta-potential. NiO-YSZ anode support, NiO-YSZ anode functional layer (AFL), and YSZ electrolyte were consecutively deposited on a graphite rod using the EPD process; materials were then co-sintered at $1400^{\circ}C$ for 4 h. The thickness of the deposited layer increased with increasing of the applied voltage and the deposition time. A YSZ-based micro tubular single cell fabricated by the EPD process exhibited a maximum power density of $0.3W/cm^2$ at $750^{\circ}C$.

• Korean Chemical Engineering Research
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• 제50권4호
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• pp.749-753
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• 2012

본 연구에서는 마이크로 원통형 SOFC 지지체의 특성을 평가하기 위해 직경 3 mm의 연료극 지지체를 제조하여 지지체의 미세구조를 분석하고, 기계적 강도 및 가스투과도를 측정하였다. 다공성 연료극 지지체의 표면과 파단면의 미세구조를 분석하기 위해 SEM (Scanning Electron Microscope)을 이용하였다. 지지체의 가스투과도는 차압계를 이용하여 50, 100, 150 cc/min의 유량에서 측정하였으며, 기계적 강도는 만능 시험기를 이용하여 측정하였다. 마이크로 원통형 연료극 지지체의 기본적인 물성 평가 후 NiO-YSZ, YSZ, YSZ-LSM/LSM/LSCF로 구성된 마이크로 SOFC 단위전지를 제조하였으며, 반응온도와 연료 유량별로 성능평가를 수행하여 $800^{\circ}C$에서 $1095mW/cm^2$의 출력이 얻어짐을 확인하였다. 또한, 반응 온도에 따른 전기화학적 임피던스 특성평가를 통하여 온도가 높아질수록 전해질 이온전도도가 증가되어 ohmic 저항이 감소되고 그에 따라 마이크로 관형 SOFC 셀 성능이 증가함을 확인할 수 있었다.

• Bulletin of the Korean Chemical Society
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• 제35권10호
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• pp.2969-2973
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• 2014

A new process to fabricate a composite LSCF-Ag cathode material for SOFCs by electron beam (e-beam) irradiation process has been suggested for operation under intermediate temperature range of $600-700^{\circ}C$. A composite LSCF-Ag cathode with uniformly coated Ag nanoparticles on the surface of the LSCF material was prepared by a facile e-beam irradiation method at room temperature. The morphology of the composite LSCF-Ag material was analyzed using a TEM, FE-SEM, and EDS. The prepared composite LSCF-Ag material can play a significant role in increasing the electro-catalytic activities and reducing the operating temperature of SOFCs. The performance of a tubular single cell prepared using the composite LSCF-Ag cathode, YSZ electrolyte and a Ni/YSZ anode was evaluated at reduced operating temperature of $600-700^{\circ}C$. The micro-structure and chemical composition of the single cell were investigated using a FE-SEM and EDS.