Power Generation Properties of a Micro Tubular SOFC Bundle Under Pressurized Conditions

2008 ◽  
Author(s):  
S. Hashimoto ◽  
Y. Liu ◽  
K. Asano ◽  
M. Mori ◽  
Y. Funahashi ◽  
...  
Keyword(s):  
Power Generation ◽  
Power Density ◽  
Atmospheric Pressure ◽  
Polarization Resistance ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Solid Oxide ◽  
Operating Pressure ◽  
Oxide Fuel ◽  
Generation Test

A micro tubular solid oxide fuel cell (SOFC) bundle was developed based on new concept. The anode-supported micro tubular SOFCs with the cell configuration, La0.6Sr0.4Co0.2Fe0.8 O3−δ (LSCF) – Ce0.9Gd0.1O2−δ (CGO) cathode / CGO electrolyte / Ni – CGO anode were fabricated and were bundled by a porous LSCF current collecting cube 1 cm on a side. The power generation test of the fabricated SOFC bundle was carried out under pressurized conditions. Using wet 30%H2 / N2 mixture gas and air, the cubic power density of the bundle at 500°C was 0.47 Wcm−3 at 0.4Acm−2, atmospheric pressure (0.1MPa). With increasing operating pressure, the performance has been improved, and the cubic power density finally reached to 0.66 Wcm−3 at 0.6MPa. Pressurization effect for the power improvement was brought about by the open circuit voltage enhancement and reduction of the polarization resistance.

Power Generation Properties of Microtubular Solid Oxide Fuel Cell Bundle Under Pressurized Conditions

2010 ◽  
Vol 8 (2) ◽  
Author(s):  
S. Hashimoto ◽  
Y. Liu ◽  
K. Asano ◽  
F. Yoshiba ◽  
M. Mori ◽  
...  
Keyword(s):  
Power Generation ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Power Density ◽  
Open Circuit ◽  
Solid Oxide ◽  
Operating Pressure ◽  
Power Gain ◽  
Oxide Fuel ◽  
Power Enhancement

A microtubular solid oxide fuel cell (SOFC) bundle was developed based on a new design. Anode-supported microtubular SOFCs with the cell configuration, La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)-Ce0.9Gd0.1O1.95 (CGO) cathode/CGO electrolyte/Ni-CGO anode were fabricated and bundled in a porous LSCF current-collecting cube with sides of 1 cm. The power generation of the fabricated SOFC bundle was measured under pressurized conditions. Using humidified 30% H2/N2 mixture gas and air, the cubic power density of the bundle at 500°C under atmospheric pressure (0.1 MPa) was 0.47 W cm−3 at 0.4 A cm−2. With increasing operating pressure, the performance increased, and the cubic power density reached 0.66 W cm−3 at 0.6 MPa. The power enhancement brought about by pressurization was due to increased open circuit voltage and reduced polarization resistance. After comparing the power gain of the pressurized SOFC and the power consumption gain of the air compressor used for pressurization, it was found that pressurized cell operation exhibited the highest actual power gain at around 0.3 MPa.

Influence of Hydrogen Sulfide in Fuel on Electric Power of Solid Oxide Fuel Cell

2007 ◽  
Vol 544-545 ◽  
pp. 997-1000 ◽  
Author(s):  
Minako Nagamori ◽  
Yoshihiro Hirata ◽  
Soichiro Sameshima
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Electric Power ◽  
Power Density ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Terminal Voltage ◽  
Ceria Electrolyte

Terminal voltage, electric power density and overpotential were measured for the solid oxide fuel cell with gadolinium-doped ceria electrolyte (Ce0.8Gd0.2O1.9, GDC), 30 vol% Ni-GDC anode and Pt cathode using a H2 fuel or biogas (CH4 47, CO2 31, H2 19 vol %) at 1073 K. Addition of 1 ppm H2S in the 3vol % H2O-containing H2 fuel gave no change in the open circuit voltage (0.79 - 0.80 V) and the maximum power density (65 - 72 mW/cm2). Furthermore, no reaction between H2S and Ni in the anode was suggested by the thermodynamic calculation. On the other hand, the terminal voltage and electric power density decreased when 1 ppm H2S gas was mixed with the biogas. After the biogas with 1 ppm H2S flowed into the anode for 8 h, the electric power density decreased from 125 to 90 mW/cm2. The reduced electric power density was also recovered by passing 3 vol % H2O-containing H2 fuel for 2 h.

Influence of Composition of Gd-Doped Ceria Electrolyte on Performance of Solid Oxide Fuel Cell

2012 ◽  
Vol 724 ◽  
pp. 389-392 ◽  
Author(s):  
Yuta Ibusuki ◽  
Yoshihiro Hirata ◽  
Soichiro Sameshima ◽  
Naoki Matsunaga
Keyword(s):  
Power Density ◽  
Open Circuit ◽  
Solid Oxide ◽  
Maximum Power ◽  
Cell Performance ◽  
Excess Oxygen ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Maximum Power Density ◽  
Oxide Ion Conductivity

Cell performance was measured for four types of Ni (40 vol%)-Gd-doped ceria (GDC) anode-supported solid oxide fuel cells with GDC electrolyte (40-120 μm thickness) of Ce1-xGdxO2-x/2 compositions (x = 0.05, 0.1, 0.15 and 0.2) at 773-1073 K using a H2 fuel. (La0.8Sr0.2)(Co0.8Fe0.2)O3 cathode was printed on the GDC films. The open circuit voltage and maximum power density at 873-1073 K showed a maximum at x = 0.1. The maximum power density at x = 0.1 was 166 and 506 mW/cm2 at 873 and 1073 K, respectively. The excess oxygen vacancy at x = 0.1-0.2, which does not contribute to the oxide ion conductivity, reacts with a H2 fuel to form electrons (H2 + VO 2H+ + VO×, VO× VO + 2e-). This reaction reduces the cell performance.

scholarly journals Fabrication and Electrochemical Performance of Zn-Doped La0.2Sr0.25Ca0.45TiO3 Infiltrated with Nickel-CGO, Iron, and Cobalt as an Alternative Anode Material for Solid Oxide Fuel Cells

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 269 ◽  
Author(s):  
Nazan Muzaffar ◽  
Nasima Arshad ◽  
Daniel Drasbæk ◽  
Bhaskar Sudireddy ◽  
Peter Holtappels
Keyword(s):  
Fuel Cells ◽  
Electrochemical Performance ◽  
Solid Oxide Fuel Cells ◽  
Polarization Resistance ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Sulphur Poisoning ◽  
Operating Temperatures

In solid oxide fuel cells, doped strontium titinates have been widely studied as anode materials due to their high n-type conductivity. They are used as current conducting backbones as an alternative to nickel-cermets, which suffer degradation due to coking, sulphur poisoning, and low tolerance to redox cycling. In this work, anode backbone materials were synthesized from La0.2Sr0.25Ca0.45TiO3−δ (LSCTA-), modified with 5 wt.% Zn, and infiltrated with nickel (Ni)/ceria gadolinium-doped cerium oxide (CGO), Fe, and Co. The electrodes were further studied for their electrochemical performance using electrochemical impedance spectroscopy (EIS) at open circuit voltage (OCV) in different hydrogen to steam ratios and at various operating temperatures (850–650 °C). Infiltration of electrocatalysts significantly reduced the polarization resistance and among the studied infiltrates, at all operating temperatures, Ni-CGO showed excellent electrode performance. The polarization resistances in 3% and 50% H2O/H2 atmosphere were found to be 0.072 and 0.025 Ω cm2, respectively, at 850 °C, and 0.091 and 0.076 Ω cm2, respectively, at 750 °C, with Ni-CGO. These values are approximately three orders of magnitude smaller than the polarization resistance (25 Ω cm2) of back bone material measured at 750 °C.

Plasma-Sprayed Y2O3-Stabilized ZrO2 Electrolyte With Improved Interlamellar Bonding for Direct Application to Solid Oxide Fuel Cells

2014 ◽  
Vol 11 (3) ◽  
Author(s):  
Shan-Lin Zhang ◽  
Cheng-Xin Li ◽  
Chang-Jiu Li
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Deposition Temperature ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Plasma Sprayed ◽  
Ysz Electrolyte ◽  
Gas Tightness

Atmospheric plasma spraying was employed to prepare anode, cathode, and Y2O3-stabilized ZrO2 (YSZ) electrolyte to aim at reducing manufacturing cost. YSZ electrolytes were deposited on the anode at different deposition temperatures of 200 °C, 400 °C and 600 °C to optimize the gas tightness of plasma-sprayed YSZ electrolyte. The influences of the deposition temperature on the microstructure and gas-tightness of plasma-sprayed YSZ electrolyte were investigated. The effect of microstructure and the gas-tightness of YSZ electrolyte on the open circuit voltage and the output performance of solid oxide fuel cells (SOFCs) were examined. The results showed with the increase of deposition temperature, the porosity of YSZ electrolytes almost decreased by about 80% and the microstructure of YSZ electrolytes changed from the typical lamellar structure to the continuous columnar crystal structure. At a deposition temperature of 600 °C the gas permeability decreased to 1.5 × 10−7 cm4gf−1s−1, and the highest open circuit voltage can reach 1.026 V, indicating the applicability of the as-sprayed YSZ directly to the SOFC electrolyte.

BiFeO3/YSZ bilayer electrolyte for low temperature solid oxide fuel cell

RSC Advances ◽  
2014 ◽  
Vol 4 (38) ◽  
pp. 19925-19931 ◽  
Author(s):  
Yu-Chieh Tu ◽  
Chun-Yu Chang ◽  
Ming-Chung Wu ◽  
Jing-Jong Shyue ◽  
Wei-Fang Su
Keyword(s):  
Fuel Cell ◽  
Low Temperature ◽  
Solid Oxide Fuel Cell ◽  
Solution Method ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Maximum Power Density ◽  
Bilayer Electrolyte

Highly crystalline perovskite BiFeO3 is obtained by a facile solution method. We have reported that the YSZ/BFO electrolyte with 17 μm/30 μm thickness, respectively, showed a maximum power density of 165 mW cm−2 and open-circuit voltage of 0.75 V at 650 °C.

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