Effect of Short Current on the Open Circuit Voltage in a Solid Oxide Fuel Cell

2019 ◽  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Solid Oxide ◽  
Oxide Fuel

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.

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.

Evaluation of Electric Power of SOFC Using Reformed Biogas

2013 ◽  
Vol 761 ◽  
pp. 11-14 ◽  
Author(s):  
Naoki Furukawa ◽  
Yoshihiro Hirata ◽  
Soichiro Sameshima ◽  
Naoki Matsunaga
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Electric Power ◽  
Open Circuit Voltage ◽  
Carbon Deposition ◽  
Open Circuit ◽  
Solid Oxide ◽  
Mixed Conductor ◽  
Oxide Fuel ◽  
Waste Food

Biogas of about 60 % CH4 -40% CO2 composition is produced from waste food or drainage. Electrochemical reforming of CH4 with CO2 using a porous gadolinium-doped ceria (GDC) cell is an attractive process to produce a H2-CO fuel used in solid oxide fuel cell. The supplied CO2 is converted to CO and O2- ions by the reaction with electrons at cathode (CO2 + 2e- → CO + O2-). The produced CO and O2- ions are transported to the anode through a porous mixed conductor GDC electrolyte. In the anode CH4 reacts with O2- ions to produce CO, H2 and electrons (CH4 + O2- → CO + 2H2 + 2e-). This process suppresses the carbon deposition from CH4. The formed H2 and CO fuels were supplied to a solid oxide fuel cell with dense GDC electrolyte (Ce0.8Gd0.2O1.9). The open circuit voltage and maximum power density were measured for the reformed gas and for a pure H2 fuel. Little difference in the electric power was measured at 1073 K for both the fuels.

Fabrication and Characterization of Anode-Supported Planar Solid Oxide Fuel Cell Manufactured by a Tape Casting Process

2008 ◽  
Vol 5 (2) ◽  
Author(s):  
Jung-Hoon Song ◽  
Nigel M. Sammes ◽  
Sun-Il Park ◽  
Seongjae Boo ◽  
Ho-Sung Kim ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Tape Casting ◽  
Casting Process ◽  
Open Circuit ◽  
Single Step ◽  
Unit Cell ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Lanthanum Strontium Manganite

A planar anode-supported electrolyte was fabricated using a tape casting method that involved a single step cofiring process. A standard NiO∕8YSZ cermet anode, 8mol% YSZ electrolyte, and a lanthanum strontium manganite cathode were used for the solid oxide fuel cell unit cell. A pressurized cofiring technique allows the creation of a thin layer of dense electrolyte about 10μm without warpage. The open circuit voltage of the unit cell indicated negligible fuel leakage through the electrolyte film due to the dense and crack-free electrolyte layer. An electrochemical test of the unit cell showed a maximum power density up to 0.173W∕cm2 at 900°C. Approximated electrochemical properties, e.g., activation energy, Ohmic resistance, and exchange current density, indicated that the cell performance was significantly influenced by the electrode properties of the unit cell.

Thick Film Processing Challenges in the Realisation of a Co-Fired Solid Oxide Fuel Cell Roll

2014 ◽  
Vol 87 ◽  
pp. 98-104 ◽  
Author(s):  
Mark Cassidy ◽  
Paul Connor ◽  
Marielle Etches ◽  
Yann Kalecheff ◽  
Marina MacHado ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Thick Film ◽  
Porous Electrode ◽  
Open Circuit ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Potential Applications ◽  
Key Aspects ◽  
Tape Cast

The Solid Oxide Fuel Cell Roll (SOFCRoll) is a novel design based on a double spiral. Combining structural advantages of tubular geometries with processing advantages of thick film methods, it utilises a single cofiring process. The initial concept used separate tape cast layers which were laminated before rolling. To optimise layer thickness to function, thinner screen printed layers were combined into the tape cast structure in 2nd generation cells. This presented several processing challenges, such as achieving dense electrolyte layers, maintaining porous electrode and current collecting layers and incorporation of integral gas channels. Performance has been promising with open circuit voltages close to 1V and cell power of over 400mW at 800°C, however cracking is still evident. Therefore further iterations are in development where thinner layers are sequentially cast, aiming to improve interfacial bonding and better match plasticity and burn out to reduce cracking. This paper reviews key aspects of understanding and development of the SOFRoll , the challenges that have been tackled and what challenges remain, along with future directions for development and potential applications for this device.

Ni/SDC Materials for Solid Oxide Fuel Cell Anode Applications by the Glycine-Nitrate Method

2010 ◽  
Vol 434-435 ◽  
pp. 731-734 ◽  
Author(s):  
Cui Yang ◽  
Ji Gui Cheng ◽  
Hai Gen He ◽  
Jian Feng Gao
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Open Circuit ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Composite Powders ◽  
Cubic Phases ◽  
Electrolyte Film ◽  
Cell Anode ◽  
Fuel Cell Anode

NiO/Ce0.8Sm0.2O1.9 (NiO/SDC, 65wt.% NiO) composite powders were synthesized by a glycine-nitrate process (GNP) to fabricate Ni/SDC anode-supported solid oxide fuel cell (SOFC). The results show that the composite powders are composed of single cubic phases of NiO and SDC and have a particle size in nanometer range. NiO/SDC ceramics were prepared from the NiO/SDC powders and were converted into Ni/SDC cermets by reduction in H2, which were employed as anode materials for SOFC with SDC electrolyte. It is shown that Ni/SDC cermets from the NiO/SDC composite powders by the GNP have porous and homogeneous microstructures and show good electrical conductivity. A single SOFC based on Ni/SDC anode with about 50µm SDC electrolyte film and about 80µm La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode was constructed. Open circuit voltage (OCV) of the cell is about 0.8V and maximum power density is 361.42 and 394.78 mWcm-2 at 750 and 800°C, respectively.

Application of Rape Pollen in Anode Substrates of Solid Oxide Fuel Cell

2012 ◽  
Vol 512-515 ◽  
pp. 1579-1583
Author(s):  
Hui Su ◽  
Ye Fan Wu ◽  
Ling Hong Luo ◽  
Jia Song Zhang ◽  
Guo Yang Sheng
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Ambient Air ◽  
Weight Percent ◽  
Open Circuit ◽  
Solid Oxide ◽  
High Porosity ◽  
Oxide Fuel ◽  
Pore Former ◽  
Percent Concentration

The physical properties and microstructures of supporting anodes are crucial for the performances of the entire SOFCs. In this investigation, the rape pollen was developed as a novel pore-former to improve the properties of the conventional NiO–YSZ(yttria-stabilized zirconia) anode substrate of solid oxide fuel cell. The advantage of using this pore-former over the conventional ones (e.g. polymethyl methacrylate (PMMA), carbon and flour) is that this pore-former had high porosity、global pore shape and uniform pore size distribution in the anode substrates, which are beneficial for rapid transport of the fuel and byproduct. The microstructure was observed by SEM, and the porosity of anode was measured by Archimedes method. The results showed that the optimum weight percent concentration was 15%, correspondingly, porosity was 40.3%, which was suitable for supporting anodes for SOFC application. And the open-circuit voltage (OCV) as high as 1.058V was obtained ,and the maximum power densities of 0.794W/cm2 was achieved at 750°C, respectively, using hydrogen as fuel and ambient air as oxidant.

NiO-SDC Powder for Solid Oxide Fuel Cell Anode Applications by Buffer Solution Method

2007 ◽  
Vol 336-338 ◽  
pp. 440-443 ◽  
Author(s):  
Ji Gui Cheng ◽  
Li Ping Deng ◽  
Er Tao Xiong ◽  
Ping Shi
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Solution Method ◽  
Open Circuit ◽  
Solid Oxide ◽  
Precipitation Method ◽  
Oxide Fuel ◽  
Buffer Solution ◽  
Composite Powders ◽  
Microstructure Observation

NiO-Samaria-Doped-Ceria (NiO-SDC) composite powders with nanometer particle size were synthesized by an improved co-precipitation method, called the buffer solution method. NiO/SDC ceramics were then prepared from the NiO-SDC composite powders and were converted into Ni/SDC cermets, which were tested as the anode materials for solid oxide fuel cell (SOFC) with SDC electrolytes. Microstructure observation showed that the NiO/SDC ceramics and Ni/SDC cermets fabricated from the NiO-SDC composite powders have more uniform and finer grain and pore size than those prepared from the mechanically mixed NiO-SDC powders, and the resulting Ni/SDC cermets also showed higher electrical conductivity than those of Ni/SDC cermets from the mechanically mixed NiO-SDC powders. Furthermore, SOFC based on the buffer solution Ni/SDC anodes exhibited higher open circuit voltage (OCV) and maximum power density.

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.

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