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.

Application of an Anode Model to Investigate Physical Parameters in an Internal Reforming Solid-Oxide Fuel Cell

2005 ◽  
Vol 2 (2) ◽  
pp. 136-140 ◽  
Author(s):  
Eric S. Greene ◽  
Maria G. Medeiros ◽  
Wilson K. S. Chiu
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Structural Parameters ◽  
Porous Electrode ◽  
Cell Voltage ◽  
Solid Oxide ◽  
Physical Parameters ◽  
Oxide Fuel ◽  
Internal Reforming ◽  
Porous Anode

A one-dimensional model of chemical and mass transport phenomena in the porous anode of a solid-oxide fuel cell, in which there is internal reforming of methane, is presented. Macroscopically averaged porous electrode theory is used to model the mass transfer that occurs in the anode. Linear kinetics at a constant temperature are used to model the reforming and shift reactions. Correlations based on the Damkohler number are created to relate anode structural parameters and thickness to a nondimensional electrochemical conversion rate and cell voltage. It is shown how these can be applied in order to assist the design of an anode.

Micro-solid oxide fuel cell using thick-film ceria

2009 ◽  
Vol 180 (11-13) ◽  
pp. 839-842 ◽  
Author(s):  
Jong Hoon Joo ◽  
Gyeong Man Choi
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Thick Film ◽  
Solid Oxide ◽  
Oxide Fuel

Lattice Boltzmann Simulation on Solid Oxide Fuel Cell Performance

2012 ◽  
Vol 472-475 ◽  
pp. 260-273
Author(s):  
Wang Jun Feng ◽  
Gong Wei Wu ◽  
You Sheng Xu
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Lattice Boltzmann ◽  
Catalyst Activity ◽  
Porous Electrode ◽  
Solid Oxide ◽  
Cell Performance ◽  
Lattice Boltzmann Model ◽  
Oxide Fuel ◽  
Internal Reforming

Based on models of a porous electrode, a more accurate lattice Boltzmann model for simulating the performance of a solid oxide fuel cell (SOFC) is proposed. Results show good agreement between simulated and measured data. The accuracy of concentration over potential prediction is crucial for low reactant concentrations. The addition of a small amount of air to the fuel yields fully stable performance without measurable carbon deposits detected on the catalyst layer or the fuel cell. Cell performance increases with the temperature. As a first test of the model, a benchmark problem regarding the performance of an internal reforming solid oxide fuel cell (IR-SOFC) is investigated. When the catalyst activity decreases, the rate of methane conversion decreases near the reactor

A Modeling Study of Porous Electrode Property Effects on Solid Oxide Fuel Cell Performance

2009 ◽  
Author(s):  
X. Xie ◽  
X. Xue
Keyword(s):  
Mathematical Model ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Reaction Zone ◽  
Polarization Curve ◽  
Porous Electrode ◽  
Solid Oxide ◽  
Design Parameters ◽  
Oxide Fuel ◽  
Active Reaction

A two-dimensional isothermal mathematical model is developed for an anode-supported planar solid oxide fuel cell (SOFC). The model takes into account the complex coupling effects of multi-physics processes including mass transfer, charge (ion/electron) transport, and electrochemical reaction. The SOFC multi-physics processes are numerically linked to SOFC global performance such as polarization curve. The model is validated using polarization curve as a metric with the experimental data from open literature. Since triple phase boundary reaction zone may vary from the vicinity of the electrolyte all the way to the entire electrode depending on selected materials and fabrication process, the effects of anode active reaction zone with different volumes are investigated comprehensively for a generic button cell using the developed mathematical model. The tradeoff design between active reaction zone volumes and other design parameters such as porosity and tortuosity of electrodes are also examined. Results show that porous composite electrode properties have very complex effects on SOFC performance. The results may provide a valuable guidance for high performance SOFC design and fabrication.

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.

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.

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.

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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