• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1999년도 하계학술대회 논문집 D
• /
• pp.1547-1549
• /
• 1999

As a preliminary experiment for the development of anode-supported tubular cell with proper porosity, we have investigated the anode substrate and the electrolyte-coated anode tube. The anode substrate was manufactured as a function of carbon content in the range of 20 to 50 vol.%. As the caron content increased, the porosity of the anode substrate increased slightly and the carbon content with proper porosity was obtained at 30 vol.%. The anode tube was fabricated by extrusion process and the electrolyte layer was coated on the anode tube by slurry dipping process. The anode-supported tube was cofired successfully. Their sintered property and microstructure were examined and the porosity of the anode tube was 35%. From the gas permeation test, the anode tube was found to be porous enough for gas supply. On the other hand, the anode-supported tube with electrolyte layer indicated a very low gas permeation rate. This means that the coated electrolyte was dense. Based upon these experimental results. we will fabricate and test the anode-supported tubular cell.

• 한국재료학회지
• /
• 제10권10호
• /
• pp.659-664
• /
• 2000

연료극 지지체식 원통형 고체산화물 연료전지를 개방하기 위해 연료극 지지체와 전해질이 코팅된 연료극 원통관의 제조 및 그것의 특성에 대해 연구하였다- 연료극 지지체는 20-50vol.%의 탄소함량에 따라 만들어졌으며, 탄소량이 증가함에 따라 연 료극 지지체의 기공율도 점차 증가하였으며, 적절한 기공율을 가지기 위한 최적 탄소량은 30vol.%임을 확인하였다. 연료극 지지체 관은 압출법으로 제작하였으며, 전해질은 슬러리 코팅법으로 원통판의 바깥쪽에 코팅하였고, $1400^{\circ}C$에서 공소결을 성공적으로 실시하였다. 소결후 물리척특성과 미세구조를 조사하였으며, 연료극 지지체관의 기공율은 35%이었고 연료전지의 요구조건을 만족하였다. 기체투과율 시험을 통하여, 연료극 지지체관 자체는 충분히 다공성을 나타내었으나, 전해질층을 코팅한 경우에는 매우 낮은 기체부과율을 나타냄을 확인하였다. 이것은 코팅된 전해질층이 매우 치밀하다는 것을 의미하며, 본 연구를 통해서 연료극 지지체식 원통형 고체산화물 연료전지가 제조될 수 있음을 확인하였다.

• 한국재료학회지
• /
• 제12권9호
• /
• pp.691-695
• /
• 2002

A low temperature anode-supported tubular solid oxide fuel cell was developed. The anode-supported tube was fabricated using extrusion process. Then the electrolyte layer and the cathode layer were coated onto the anode tube by slurry dipping process, subsequently. The anode tube and electrolyte were co-fired at $140^{\circ}C$, and the cathode was sintered at $1200^{\circ}C$. The thickness and gas permeability of the electrolyte depended on the number of coating and the slurry concentration. Anode-supported tube was satisfied with SOFC requirements, related to electrical conductivity, pore structure, and gas diffusion limitations. At operating temperature of $800^{\circ}C$, open circuit voltage of the cell with gastight and dense electrolyte layer was 1.1 V and the cell showed a good performance of 450 mW/$\textrm{cm}^2$.

• 한국수소및신에너지학회논문집
• /
• 제17권1호
• /
• pp.82-89
• /
• 2006

The redox behaviors of anode-supported flat tube for solid oxide fuel cell has been studied. The mass change of the extruded NiO/YSZ anode flat tube during redox cycling was examined by thermogravimetric analysis(TGA). The result of TGA was shown a rapidly mass change in the range of $455\;-\;670^{\circ}C$ and the reoxidation of the NiO/YSZ anode was almost completed at $750^{\circ}C$. The starting temperature of reoxidation and the maximum temperature of oxidation rate decreased with increasing the reoxidation cycle, which is attributed to the increased porosity caused by volume change. Bending strengths of the NiO/YSZ anode after redox cycling were 96 - 80 MPa and the bending strength decreased slightly with increasing the redox cycle. On the other hand, the bending strength of the NiO/YSZ anode with electrolyte showed 130 MPa after first redox cycling but decreased rapidly with increasing the redox cycle. From the results of the bending test and the microstructure observation, we conclude that the crack initiation of the electrolyte-coated NiO/YSZ anode was induced easily at interface of electrolyte/anode tube and propagated cross the electrolyte.

• 한국재료학회지
• /
• 제14권5호
• /
• pp.368-373
• /
• 2004

To improve the conventional cathode-supported tubular solid oxide fuel cell (SOFC) from the viewpoint of low cell power density, expensive fabrication process and high operation temperature, the anode-supported tubular solid oxide fuel cell was investigated. The anode tube of Ni-8mol% $Y_2$O$_3$-stabilized $ZrO_2$ (8YSZ) was manufactured by extrusion process, and, the electrolyte of 8YSZ and the multi-layered cathode of $LaSrMnO_3$(LSM)ILSM-YSZ composite/$LaSrCoFeO_3$ were coated on the surface of the anode tube by slurry dip coating process, subsequently. Their cell performances were examined under gases of humidified hydrogen with 3% water and air. In the thermal cycle condition of heating and cooling rates with $3.33^{\circ}C$/min, the anode-supported tubular cell showed an excellent resistance as compared with the electrolyte-supported planar cell. The optimum hydrogen flow rate was evaluated and the air preheating increased the cell performance due to the increased gas temperature inside the cell. In long-term stability test, the single cell indicated a stable performance of 300 mA/$\textrm{cm}^2$ at 0.85 V for 255 hr.

• 유체기계공업학회:학술대회논문집
• /
• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
• /
• pp.373-380
• /
• 2001

Solid Oxide Fuel Cells (SOFCs) have received considerable attention because of the advantages of high effiiciency, low pollution, cogeneration application and excellent integration with simplified reformer In this paper, we reported development of anode-tubular SOFC by wet process. For making tubular cell, Ni-cermet YSZ anode tube was fabricated using extrusion process, and YSZ electrolyte layer and LSM-YSZ composite, LSM, LSCF cathode layer were coated onto the anode supported tube using slurry dipping process and sintered by co-firing process. By using this tubular cell, we fabricated single cell consisted of the various cathode layers and 4 cell stack with an effective area of $75 cm^2$ per single cell, and evaluated their performance characteristics.

• 한국전기화학회:학술대회논문집
• /
• 한국전기화학회 1998년도 제1회 총회 및 추계학술발표회
• /
• pp.91-91
• /
• 1998

• 전기화학회지
• /
• 제9권4호
• /
• pp.151-157
• /
• 2006

A two-dimensional numerical model to study the performance of anode-supported flat-tube solid oxide fuel cell (SOFC) far the cross section of the cell in the flow direction of the fuel and air flows is developed. In this model a mass and charge balance, Maxwell-Stefan equation as well as the momentum equation by using, Darcy's law are applied in differential form. The finite element method using FEMLAB commercial software is used for meshing, discritization and solving the system of coupled differential equations. The current density distribution and fuel consumption as well as water production are analyzed. Experimental data is used to verify a predicted voltage-current density and power density versus current density to judge on the model accuracy.

• 한국전기화학회:학술대회논문집
• /
• 한국전기화학회 2002년도 연료전지심포지움 2002논문집
• /
• pp.123-126
• /
• 2002

• 한국전기화학회:학술대회논문집
• /
• 한국전기화학회 2004년도 춘계총회 및 학술발표회
• /
• pp.70-70
• /
• 2004