Pyrolyzable pore-formers for the porous-electrode formation in solid oxide fuel cells: A review

Hedayat, Nader; Du, Yanhai; Ilkhani, Hoda

doi:10.1016/j.ceramint.2017.12.157

Cited by 33 publications

(12 citation statements)

References 150 publications

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“…The porous microstructure of SOFC electrodes correlates with the TPBs, gas diffusio and concentration polarization. Adding an interlayer such as an AFL between the electro lyte and anode, and impregnating electrocatalytic particles into the porous anode effec tively increased the TPBs and decreased the contact resistance between the electrolyte and the electrode [93][94][95][96]. However, the AFL and solution impregnation require additiona The porous microstructure of SOFC electrodes correlates with the TPBs, gas diffusion and concentration polarization.…”

Section: Psudo-core-shell Anode By Ultrasonic Spray Pyrolyzed Impregnationmentioning

confidence: 99%

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

2021

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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.

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Section: Psudo-core-shell Anode By Ultrasonic Spray Pyrolyzed Impregnationmentioning

confidence: 99%

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

2021

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“…Porosity performs an essential function in enhancing the performance of SOFC electrodes because gas-phase diffusion resistance can be significant, even far away from the limiting current [43]. Controlling porosity can improve electrode performance by facilitating gas diffusion [44]. Laguna-Bercero et al [45] reported microbeads with 6 µm diameter is a good pore former for generating a microstructure that works well in both SOEC and SOFC modes.…”

Section: Introductionmentioning

confidence: 99%

Improvement of La0.8Sr0.2MnO3−δ Cathode Material for Solid Oxide Fuel Cells by Addition of YFe0.5Co0.5O3

et al. 2022

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The high efficiency of solid oxide fuel cells with La0.8Sr0.2MnO3−δ (LSM) cathodes working in the range of 800–1000 °C, rapidly decreases below 800 °C. The goal of this study is to improve the properties of LSM cathodes working in the range of 500–800 °C by the addition of YFe0.5Co0.5O3 (YFC). Monophasic YFC is synthesized and sintered at 950 °C. Composite cathodes are prepared on Ce0.8Sm0.2O1.9 electrolyte disks using pastes containing YFC and LSM powders mixed in 0:1, 1:19, and 1:1 weight ratios denoted LSM, LSM1, and LSM1, respectively. X-ray diffraction patterns of tested composites reveal the presence of pure perovskite phases in samples sintered at 950 °C and the presence of Sr4Fe4O11, YMnO3, and La0.775Sr0.225MnO3.047 phases in samples sintered at 1100 °C. Electrochemical impedance spectroscopy reveals that polarization resistance increases from LSM1, by LSM, to LSM2. Differences in polarization resistance increase with decreasing operating temperatures because activation energy rises in the same order and equals to 1.33, 1.34, and 1.58 eV for LSM1, LSM, and LSM2, respectively. The lower polarization resistance of LSM1 electrodes is caused by the lower resistance associated with the charge transfer process.

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“…Solid oxide fuel cells (SOFCs) are considered to be a major pathway toward overcoming the impending energy crisis and protecting the environment, primarily due to their higher efficiency and lower carbon footprint. − Research and development over the past several decades have enhanced SOFC materials, geometries, and operating conditions to a great extent. − However, one aspect of SOFC operation that remains relatively unexplored is the effect of cathode gas composition on cell performance. While SOFCs are known to operate on many different fuels (e.g., hydrogen, natural gas, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxygen Diffusion Constraints on the Performance of Planar Solid Oxide Fuel Cells for Variable Oxygen Concentration

Biswas

Bhattacharya

Kumar

et al. 2020

Ind. Eng. Chem. Res.

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Performance enhancement of solid oxide fuel cell (SOFC) has been a very prominent research problem of the present era. One of the key performance-limiting factors is diffusional constraint encountered in SOFC cathodes during operation with air. While attempts at improving cell performance have been made through the optimization of geometries, flow rates, and operating conditions, very few studies have reported the potential for performance enhancement through the optimization of cathode gas composition. The present study takes an experimental as well as theoretical approach to examine the extent to which SOFC performance can be enhanced through alterations in the oxygen concentration of cathode gas (without varying the oxygen molar flow rate). An SOFC is operated for various cathodic oxygen concentrations, and the experimental protocol is simulated using a parametric computational fluid dynamics study. The results depict remarkable nonlinearities in the dependence of cell performance indicators on cathode gas oxygen concentration, which opens up a new dimension for the optimization of cell efficiency, contingent on the availability of oxygen, and the design and operational constraints unique to specific SOFC development ventures.

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Pyrolyzable pore-formers for the porous-electrode formation in solid oxide fuel cells: A review

Cited by 33 publications

References 150 publications

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

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

Improvement of La0.8Sr0.2MnO3−δ Cathode Material for Solid Oxide Fuel Cells by Addition of YFe0.5Co0.5O3

Effect of Oxygen Diffusion Constraints on the Performance of Planar Solid Oxide Fuel Cells for Variable Oxygen Concentration

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