Investigation on niobium oxide coatings for protecting and enhancing the performance of Ni cathode in the MCFC
| Autor: | A. Meléndez-Ceballos, S.M. Fernández-Valverde, Armelle Ringuedé, Virginie Lair, V. Albin, J.A. Chávez-Carvayar, Michel Cassir |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences law.invention Atomic layer deposition Coating law Niobium oxide Eutectic system Renewable Energy Sustainability and the Environment 021001 nanoscience & nanotechnology Condensed Matter Physics Cathode 0104 chemical sciences Dielectric spectroscopy Nickel Fuel Technology chemistry engineering Mixed oxide 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 41:18721-18731 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2016.04.045 |
| Popis: | This study addresses the problem of the nickel cathode dissolution, decreasing the lifetime of molten carbonate fuel cells, by a protective coating of Nb2O5 processed by atomic layer deposition ALD onto the porous cathode substrate. Samples of different thicknesses were tested electrochemically in molten Li2CO3-K2CO3 eutectic at 650 °C during 230 h by means of chronopotentiometry and electrochemical impedance spectroscopy. A significant decrease in the stabilization time with respect to the oxygen reduction potential is observed with niobium coatings, which could indicate an electrocatalytic process favoured by the presence of Nb. The structure and morphology of the coated samples are characterised by XRD, SEM and XPS before and after the electrochemical tests. Mixed lithiated Ni and Nb oxides are likely to be formed at the cathode surface. Interestingly, this Nb-containing mixed oxide not only can protect Ni cathode but also maintains its good performance. |
| Databáze: | OpenAIRE |
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