scholarly journals Inkjet Printing Functionalization of SOFC LSCF Cathodes

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 654 ◽  
Author(s):  
Eleonora Venezia ◽  
Massimo Viviani ◽  
Sabrina Presto ◽  
Vasant Kumar ◽  
Rumen I. Tomov
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Inkjet Printing ◽  
High Efficiency ◽  
Electrochemical Impedance ◽  
Electrical Energy ◽  
Reduction Reaction ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Ion Conductor

An important segment of the future renewable energy economy is the implementation of novel energy generation systems. Such electrochemical systems are solid oxide fuel cells, which have the advantage of direct conversion of the chemical energy stored in the fuel to electrical energy with high efficiency. Improving the performance and lowering the cost of solid oxide fuel cells (SOFCs) are strongly dependent on finding commercially viable methods for nano-functionalization of their electrodes via infiltration. Inkjet printing technology was proven to be a feasible method providing scalability and high-resolution ink delivery. LaxSr1−xCoyFe1−yO3−δ cathodes were modified using inkjet printing for infiltration with two different materials: Gd-doped ceria (CGO) commonly used as ion-conductor and La0.6Sr0.4CoO3–δ (LCO) commonly used as a mixed ionic electronic conductor. As-modified surface structures promoted the extension of the three-phase boundary (TPB) and enhanced the mechanisms of the oxygen reduction reaction. Electrochemical impedance measurements revealed significantly lowered polarization resistances (between 2.7 and 3.7 times) and maximum power output enhancement of 24% for CGO infiltrated electrodes and 40% for LCO infiltrated electrodes.

Characterization of SOFCS: A Crystallographic Analysis and First Steps towards an Impedance Spectroscopy Approach

2012 ◽  
Vol 727-728 ◽  
pp. 769-774
Author(s):  
A. Ávila ◽  
J. Poveda ◽  
D. Gómez ◽  
D. Hotza ◽  
J. Escobar
Keyword(s):  
Fuel Cells ◽  
Impedance Spectroscopy ◽  
Solid Oxide Fuel Cells ◽  
Electrochemical Impedance ◽  
Electrical Energy ◽  
Crystallographic Analysis ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Major Disadvantage ◽  
Different Temperatures

Solid oxide fuel cells (SOFCs) have emerged as an efficient way to transform chemical energy into electrical energy. However, a major disadvantage of this technology is related to the high temperatures required for SOFC operation. In this way, new materials are necessary to maintain the electrical properties of the cell at intermediate temperatures. Based on these ideas, it is necessary to study both the structural variation of the cells components at different temperatures and their electrochemical behavior. In this work, a crystallographic characterization is presented, which was performed in a commercial SOFC cell using X-ray diffraction (XRD). An equivalent linear electrical model to predict SOFC losses is developed as well. Keywords: Solid oxide fuel cells (SOFCs); AC impedance; Electrochemical impedance spectroscopy (EIS); Equivalent circuit models.

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

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 642
Author(s):  
Michał Mosiałek ◽  
Małgorzata Zimowska ◽  
Dzmitry Kharytonau ◽  
Anna Komenda ◽  
Miłosz Górski ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Polarization Resistance ◽  
High Efficiency ◽  
Electrochemical Impedance ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
X Ray Diffraction ◽  
Composite Cathodes ◽  
Diffraction Patterns

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.

scholarly journals Insights in to the Electrochemical Activity of Fe-Based Perovskite Cathodes toward Oxygen Reduction Reaction for Solid Oxide Fuel Cells

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1260
Author(s):  
Dan Ma ◽  
Juntao Gao ◽  
Tian Xia ◽  
Qiang Li ◽  
Liping Sun ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Electrochemical Impedance ◽  
Single Cells ◽  
Reduction Reaction ◽  
Solid Oxide ◽  
Oxide Fuel

The development of novel oxygen reduction electrodes with superior electrocatalytic activity and CO2 durability is a major challenge for solid oxide fuel cells (SOFCs). Here, novel cobalt-free perovskite oxides, BaFe1−xYxO3−δ (x = 0.05, 0.10, and 0.15) denoted as BFY05, BFY10, and BFY15, are intensively evaluated as oxygen reduction electrode candidate for solid oxide fuel cells. These materials have been synthesized and the electrocatalytic activity for oxygen reduction reaction (ORR) has been investigated systematically. The BFY10 cathode exhibits the best electrocatalytic performance with a lowest polarization resistance of 0.057 Ω cm2 at 700 °C. Meanwhile, the single cells with the BFY05, BFY10 and BFY15 cathodes deliver the peak power densities of 0.73, 1.1, and 0.89 W cm−2 at 700 °C, respectively. Furthermore, electrochemical impedance spectra (EIS) are analyzed by means of distribution of relaxation time (DRT). The results indicate that the oxygen adsorption-dissociation process is determined to be the rate-limiting step at the electrode interface. In addition, the single cell with the BFY10 cathode exhibits a good long-term stability at 700 °C under an output voltage of 0.5 V for 120 h.

An easy and innovative method based on spray-pyrolysis deposition to obtain high efficiency cathodes for Solid Oxide Fuel Cells

2016 ◽  
Vol 319 ◽  
pp. 48-55 ◽  
Author(s):  
L. dos Santos-Gómez ◽  
J.M. Porras-Vázquez ◽  
F. Martín ◽  
J.R. Ramos-Barrado ◽  
E.R. Losilla ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Spray Pyrolysis ◽  
High Efficiency ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Innovative Method ◽  
Spray Pyrolysis Deposition

Achieving Performance and Longevity with Butane-operated Low-temperature Solid Oxide Fuel Cells using Low-Cost Cu and CeO2 Catalysts

2021 ◽  
Author(s):  
Cam-Anh Thieu ◽  
Sungeun Yang ◽  
Ho-Il Ji ◽  
Hyoungchul Kim ◽  
Kyung Joong Yoon ◽  
...  
Keyword(s):  
Thin Film ◽  
Fuel Cells ◽  
Low Temperature ◽  
Solid Oxide Fuel Cells ◽  
High Efficiency ◽  
Operating Temperature ◽  
Low Cost ◽  
Solid Oxide ◽  
Oxide Fuel

Thin-film solid oxide fuel cells (TF-SOFCs) effectively lower the operating temperature of typical solid oxide fuel cells (SOFCs) below 600 °C, while maintaining high efficiency and using low-cost catalyst. But...

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