Oxygen Reduction Mechanisms in Nanostructured La0.8Sr0.2MnO3 Cathodes for Solid Oxide Fuel Cells

Joaquín Sacanell; Joaquín Hernández Sánchez; Adrián Ezequiel Rubio López; Hernán Martinelli; Jimena Siepe; Ana G. Leyva; Valeria Ferrari; Dilson Juan; Miguel Pruneda; Augusto Mejía Gómez; Diego G. Lamas

doi:10.1021/acs.jpcc.7b00627

Oxygen Reduction Mechanisms in Nanostructured La_0.8Sr_0.2MnO₃ Cathodes for Solid Oxide Fuel Cells

Joaquín Sacanell, Joaquín Hernández Sánchez, Adrián Ezequiel Rubio López, Hernán Martinelli, Jimena Siepe, Ana G. Leyva, Valeria Ferrari, Dilson Juan, Miguel Pruneda, Augusto Mejía Gómez, Diego G. Lamas

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

In this work we outline the mechanisms contributing to the oxygen reduction reaction in nanostructured cathodes of La_0.8Sr_0.2MnO₃ (LSM) for Solid Oxide Fuel Cells (SOFC). These cathodes, developed from LSM nanostructured tubes, can be used at lower temperatures compared to microstructured ones, and this is a crucial fact to avoid the degradation of the fuel cell components. This reduction of the operating temperatures stems mainly from two factors: (i) the appearance of significant oxide ion diffusion through the cathode material in which the nanostructure plays a key role and (ii) an optimized gas phase diffusion of oxygen through the porous structure of the cathode, which becomes negligible. A detailed analysis of our Electrochemical Impedance Spectroscopy supported by first-principles calculations point toward an improved overall cathodic performance driven by a fast transport of oxide ions through the cathode surface. (Figure Presented).

Original language	English
Pages (from-to)	6533-6539
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	121
Issue number	12
DOIs	https://doi.org/10.1021/acs.jpcc.7b00627
State	Published - 30 Mar 2017
Externally published	Yes

Keywords

Solid oxide fuel cells (SOFC)
Calculations
Cathodes
Electrochemical impedance spectroscopy
Electrodes
Electrolytic reduction
Fuel cells
Manganese oxide
Nanostructures
Oxygen
Reduction

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10.1021/acs.jpcc.7b00627

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Sacanell, J., Hernández Sánchez, J., Rubio López, A. E., Martinelli, H., Siepe, J., Leyva, A. G., Ferrari, V., Juan, D., Pruneda, M., Mejía Gómez, A., & Lamas, D. G. (2017). Oxygen Reduction Mechanisms in Nanostructured La_0.8Sr_0.2MnO₃ Cathodes for Solid Oxide Fuel Cells. Journal of Physical Chemistry C, 121(12), 6533-6539. https://doi.org/10.1021/acs.jpcc.7b00627

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title = "Oxygen Reduction Mechanisms in Nanostructured La0.8Sr0.2MnO3 Cathodes for Solid Oxide Fuel Cells",

abstract = "In this work we outline the mechanisms contributing to the oxygen reduction reaction in nanostructured cathodes of La0.8Sr0.2MnO3 (LSM) for Solid Oxide Fuel Cells (SOFC). These cathodes, developed from LSM nanostructured tubes, can be used at lower temperatures compared to microstructured ones, and this is a crucial fact to avoid the degradation of the fuel cell components. This reduction of the operating temperatures stems mainly from two factors: (i) the appearance of significant oxide ion diffusion through the cathode material in which the nanostructure plays a key role and (ii) an optimized gas phase diffusion of oxygen through the porous structure of the cathode, which becomes negligible. A detailed analysis of our Electrochemical Impedance Spectroscopy supported by first-principles calculations point toward an improved overall cathodic performance driven by a fast transport of oxide ions through the cathode surface. (Figure Presented).",

keywords = "Solid oxide fuel cells (SOFC), Calculations, Cathodes, Electrochemical impedance spectroscopy, Electrodes, Electrolytic reduction, Fuel cells, Manganese oxide, Nanostructures, Oxygen, Reduction",

author = "Joaqu{\'i}n Sacanell and {Hern{\'a}ndez S{\'a}nchez}, Joaqu{\'i}n and {Rubio L{\'o}pez}, {Adri{\'a}n Ezequiel} and Hern{\'a}n Martinelli and Jimena Siepe and Leyva, {Ana G.} and Valeria Ferrari and Dilson Juan and Miguel Pruneda and {Mej{\'i}a G{\'o}mez}, Augusto and Lamas, {Diego G.}",

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doi = "10.1021/acs.jpcc.7b00627",

language = "English",

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AU - Sacanell, Joaquín

AU - Hernández Sánchez, Joaquín

AU - Rubio López, Adrián Ezequiel

AU - Martinelli, Hernán

AU - Siepe, Jimena

AU - Leyva, Ana G.

AU - Ferrari, Valeria

AU - Juan, Dilson

AU - Pruneda, Miguel

AU - Mejía Gómez, Augusto

AU - Lamas, Diego G.

PY - 2017/3/30

Y1 - 2017/3/30

N2 - In this work we outline the mechanisms contributing to the oxygen reduction reaction in nanostructured cathodes of La0.8Sr0.2MnO3 (LSM) for Solid Oxide Fuel Cells (SOFC). These cathodes, developed from LSM nanostructured tubes, can be used at lower temperatures compared to microstructured ones, and this is a crucial fact to avoid the degradation of the fuel cell components. This reduction of the operating temperatures stems mainly from two factors: (i) the appearance of significant oxide ion diffusion through the cathode material in which the nanostructure plays a key role and (ii) an optimized gas phase diffusion of oxygen through the porous structure of the cathode, which becomes negligible. A detailed analysis of our Electrochemical Impedance Spectroscopy supported by first-principles calculations point toward an improved overall cathodic performance driven by a fast transport of oxide ions through the cathode surface. (Figure Presented).

AB - In this work we outline the mechanisms contributing to the oxygen reduction reaction in nanostructured cathodes of La0.8Sr0.2MnO3 (LSM) for Solid Oxide Fuel Cells (SOFC). These cathodes, developed from LSM nanostructured tubes, can be used at lower temperatures compared to microstructured ones, and this is a crucial fact to avoid the degradation of the fuel cell components. This reduction of the operating temperatures stems mainly from two factors: (i) the appearance of significant oxide ion diffusion through the cathode material in which the nanostructure plays a key role and (ii) an optimized gas phase diffusion of oxygen through the porous structure of the cathode, which becomes negligible. A detailed analysis of our Electrochemical Impedance Spectroscopy supported by first-principles calculations point toward an improved overall cathodic performance driven by a fast transport of oxide ions through the cathode surface. (Figure Presented).

KW - Solid oxide fuel cells (SOFC)

KW - Calculations

KW - Cathodes

KW - Electrochemical impedance spectroscopy

KW - Electrodes

KW - Electrolytic reduction

KW - Fuel cells

KW - Manganese oxide

KW - Nanostructures

KW - Oxygen

KW - Reduction

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UR - https://www.researchgate.net/publication/312620154_Oxygen_reduction_mechanisms_in_nanostructured_La08Sr02MnO3_cathodes_for_Solid_Oxide_Fuel_Cells

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Oxygen Reduction Mechanisms in Nanostructured La_0.8Sr_0.2MnO₃ Cathodes for Solid Oxide Fuel Cells

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