Chemical synthesis of materials based on calcium zirconate for solid oxide fuel cells (SOFC)

Fuel cells allow the production of energy from a clean electrochemical reaction. Among various types, the solid oxide fuel cell (SOFC) operates at high temperatures, allowing the conversion of hydrogen fuel into electricity, where water is generated as a by‐product. Strontium‐doped lanthanum mangani...

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Bibliographic Details
Published in:Environmental progress 2019-11, Vol.38 (6), p.n/a
Main Authors: Vieira, Bruno M., Nadaleti, Willian C., Almeida, Suelen R., Eliker, Carolina, Silva Cava, Sergio, Raubach, Cristiane W., Sousa, Vania C.
Format: Article
Language:English
Subjects:
Activation energy
Calcium
Calcium oxide
Calcium zirconate
Cathodes
Cell activation
ceramic material
Chemical synthesis
Clean energy
Composite materials
Electrochemical impedance spectroscopy
Electrochemistry
Electrode materials
Electrolytes
Electrolytic cells
fuel cell
Fuel cells
Fuel technology
High temperature
Hydrogen fuels
Lanthanum
Lanthanum compounds
Lime
manganite
Operating temperature
Organic chemistry
Solid oxide fuel cells
Spectroscopy
Strontium
Temperature
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Summary:Fuel cells allow the production of energy from a clean electrochemical reaction. Among various types, the solid oxide fuel cell (SOFC) operates at high temperatures, allowing the conversion of hydrogen fuel into electricity, where water is generated as a by‐product. Strontium‐doped lanthanum manganite (La1‐xSrxMnO3, LSM) is commonly used as a cathodic material in traditional high‐temperature solid oxide fuel cells. Nowadays, the operating temperature of SOFCs should be reduced to 600–800°C due to improved fine electrolyte production techniques and the use of some intermediate temperature electrolytes. The LSM is not a suitable cathode for SOFCs operating in this temperature range, since it does not have a high enough conductivity and its electrochemical activity is very low as well. In this article, the performance improvement of LSM is described by mixing with calcium zirconate. The composite ceramic materials CaZrO3−La0.6Sr0.4MnO3, CaZrO3−NiO, and CaZrO3 were synthesized by combustion method, for application as a SOFC single cell. The results prove that the synthesized materials have potential to be used in a SOFC cell. At 800°C, was confirmed the CaZrO3 formation. Through Electrochemical impedance spectroscopy, the analysis presented low activation energy and the materials have been demonstrated to be compatible, an important fact to construct a suitable SOFC cell. The obtained activation energy was 0.90, 0.85, and 0.51 eV for the electrolyte, the anode and the cathode, respectively.
ISSN:1944-7442
1944-7450
DOI:10.1002/ep.13243