scholarly journals An Overview on the Novel Core-Shell Electrodes for Solid Oxide Fuel Cell (SOFC) Using Polymeric Methodology

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2774
Author(s):  
Rong-Tsu Wang ◽  
Horng-Yi Chang ◽  
Jung-Chang Wang
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Electrode Materials ◽  
Present Report ◽  
Porous Electrode ◽  
Solid Oxide ◽  
Core Shell ◽  
Oxide Fuel ◽  
Transport Pathway ◽  
The Core

Lowering the interface charge transfer, ohmic and diffusion impedances are the main considerations to achieve an intermediate temperature solid oxide fuel cell (ITSOFC). Those are determined by the electrode materials selection and manipulating the microstructures of electrodes. The composite electrodes are utilized by a variety of mixed and impregnation or infiltration methods to develop an efficient electrocatalytic anode and cathode. The progress of our proposed core-shell structure pre-formed during the preparation of electrode particles compared with functional layer and repeated impregnation by capillary action. The core-shell process possibly prevented the electrocatalysis decrease, hindering and even blocking the fuel gas path through the porous electrode structure due to the serious agglomeration of impregnated particles. A small amount of shell nanoparticles can form a continuous charge transport pathway and increase the electronic and ionic conductivity of the electrode. The triple-phase boundaries (TPBs) area and electrode electrocatalytic activity are then improved. The core-shell anode SLTN-LSBC and cathode BSF-LC configuration of the present report effectively improve the thermal stability by avoiding further sintering and thermomechanical stress due to the thermal expansion coefficient matching with the electrolyte. Only the half-cell consisting of 2.75 μm thickness thin electrolyte iLSBC with pseudo-core-shell anode LST could provide a peak power of 325 mW/cm2 at 700 °C, which is comparable to other reference full cells’ performance at 650 °C. Then, the core-shell electrodes preparation by simple chelating solution and cost-effective one process has a potential enhancement of full cell electrochemical performance. Additionally, it is expected to apply for double ions (H+ and O2−) conducting cells at low temperature.

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.

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.

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.

scholarly journals Calcium manganite as oxygen electrode materials for reversible solid oxide fuel cell

2015 ◽  
Vol 182 ◽  
pp. 289-305 ◽  
Author(s):  
Chengsheng Ni ◽  
John T. S. Irvine
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Polarization Resistance ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Variable Temperature ◽  
Oxygen Electrode ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Electrochemical Impedance Spectra

For an efficient high-temperature reversible solid oxide fuel cell (RSOFC), the oxygen electrode should be highly active for the conversion between oxygen anions and oxygen gas. CaMnO3−δ (CM) is a perovskite that can be readily reduced with the formation of Mn3+ giving rise to oxygen defective phases. CM is examined here as the oxygen electrode for a RSOFC. CaMn0.9Nb0.1O3−δ (CMN) with Nb doping shows superior electric conductivity (125 S cm−1 at 700 °C) compared with CM (1–5 S cm−1 at 700 °C) in air which is also examined for comparison. X-ray diffraction (XRD) data show that CM and CMN are compatible with the widely used yttria-stabilized zirconia (YSZ) electrolyte up to 950 °C. Both materials show a thermal expansion coefficient (TEC) close to 10.8–10.9 ppm K−1 in the temperature range between 100–750 °C, compatible with that of YSZ. Polarization curves and electrochemical impedance spectra for both fuel cell and steam electrolysis modes were investigated at 700 °C, showing that CM presented a polarization resistance of 0.059 Ω cm2 under a cathodic bias of −0.4 V while CMN gave a polarization resistance of 0.081 Ω cm2 under an anodic bias of 0.4 V. The phase stability up to 900 °C of these materials was investigated with thermogravimetric analysis (TGA) and variable temperature XRD.

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