The Effect of Ni Doping on the Performance and Electronic Structure of LSCF Cathodes Used for IT-SOFCs

Antonino Martorana, Fabrizio Puleo, Leonarda Francesca Liotta, Alessandro Longo, Valeria La Parola, Valeria La Parola, Alessandro Longo, Leonarda F. Liotta, Dipanjan Banerjee, Christoph J. Sahle, Fabrizio Puleo, Chiara Cavallari, Marco Moretti Sala

Risultato della ricerca: Article

7 Citazioni (Scopus)

Abstract

We investigated the effect of nickel doping on the electronic structure and performance of nanostructured La0.6Sr0.4Co0.2Fe0.8-0.03Ni0.03O3-δprepared by the one-pot sol-gel method. The commercial undoped La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF0.8) was used as reference. Moreover, for comparison, Ni (3 mol %) was deposited by wetness impregnation over the La0.6Sr0.4Co0.2Fe0.8O3-δ. We show by in situ X-ray absorption spectroscopy at 900 °C under air flow that nickel enters the B perovskite site of the material and favors the stabilization of the cobalt oxidation state, as evidenced by the delay in the decrease of the average Co valence with respect to undoped samples. Our results are further supported by in situ X-ray Raman spectroscopy (XRS) that allowed us to monitor the temperature evolution of the O K-edge. XRS evidences that nickel-doped LSCF shows unmodified O2p-TM3d density of states, which proves that the Co oxidation state is preserved. Electrochemical impedance spectroscopy measurements were carried out over half-cell systems consisting of LSCF-based materials deposited onto a Ce0.8Gd0.2O2-δelectrolyte. The improvement of the electrochemical performances of the Ni-doped La0.6Sr0.4Co0.2Fe0.8-0.03Ni0.03O3-δsample with respect to a reference Ni-impregnated LSCF is attributed to the stabilization of the TM-O6structural units, which were recently proposed as the functional units for oxygen reduction.
Lingua originaleEnglish
pagine (da-a)1003-1013
Numero di pagine11
RivistaJOURNAL OF PHYSICAL CHEMISTRY. C
Volume122
Stato di pubblicazionePublished - 2018

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Solid oxide fuel cells (SOFC)
Nickel
Electronic structure
Cathodes
cathodes
Doping (additives)
nickel
electronic structure
X ray spectroscopy
Raman spectroscopy
Stabilization
stabilization
Oxidation
oxidation
X ray absorption spectroscopy
x rays
air flow
Cobalt
Electrochemical impedance spectroscopy
Impregnation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry
  • Energy(all)

Cita questo

The Effect of Ni Doping on the Performance and Electronic Structure of LSCF Cathodes Used for IT-SOFCs. / Martorana, Antonino; Puleo, Fabrizio; Liotta, Leonarda Francesca; Longo, Alessandro; La Parola, Valeria; La Parola, Valeria; Longo, Alessandro; Liotta, Leonarda F.; Banerjee, Dipanjan; Sahle, Christoph J.; Puleo, Fabrizio; Cavallari, Chiara; Moretti Sala, Marco.

In: JOURNAL OF PHYSICAL CHEMISTRY. C, Vol. 122, 2018, pag. 1003-1013.

Risultato della ricerca: Article

Martorana, A, Puleo, F, Liotta, LF, Longo, A, La Parola, V, La Parola, V, Longo, A, Liotta, LF, Banerjee, D, Sahle, CJ, Puleo, F, Cavallari, C & Moretti Sala, M 2018, 'The Effect of Ni Doping on the Performance and Electronic Structure of LSCF Cathodes Used for IT-SOFCs', JOURNAL OF PHYSICAL CHEMISTRY. C, vol. 122, pagg. 1003-1013.
Martorana, Antonino ; Puleo, Fabrizio ; Liotta, Leonarda Francesca ; Longo, Alessandro ; La Parola, Valeria ; La Parola, Valeria ; Longo, Alessandro ; Liotta, Leonarda F. ; Banerjee, Dipanjan ; Sahle, Christoph J. ; Puleo, Fabrizio ; Cavallari, Chiara ; Moretti Sala, Marco. / The Effect of Ni Doping on the Performance and Electronic Structure of LSCF Cathodes Used for IT-SOFCs. In: JOURNAL OF PHYSICAL CHEMISTRY. C. 2018 ; Vol. 122. pagg. 1003-1013.
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title = "The Effect of Ni Doping on the Performance and Electronic Structure of LSCF Cathodes Used for IT-SOFCs",
abstract = "We investigated the effect of nickel doping on the electronic structure and performance of nanostructured La0.6Sr0.4Co0.2Fe0.8-0.03Ni0.03O3-{\^I}´prepared by the one-pot sol-gel method. The commercial undoped La0.6Sr0.4Co0.2Fe0.8O3-{\^I}´(LSCF0.8) was used as reference. Moreover, for comparison, Ni (3 mol {\%}) was deposited by wetness impregnation over the La0.6Sr0.4Co0.2Fe0.8O3-{\^I}´. We show by in situ X-ray absorption spectroscopy at 900 {\^A}°C under air flow that nickel enters the B perovskite site of the material and favors the stabilization of the cobalt oxidation state, as evidenced by the delay in the decrease of the average Co valence with respect to undoped samples. Our results are further supported by in situ X-ray Raman spectroscopy (XRS) that allowed us to monitor the temperature evolution of the O K-edge. XRS evidences that nickel-doped LSCF shows unmodified O2p-TM3d density of states, which proves that the Co oxidation state is preserved. Electrochemical impedance spectroscopy measurements were carried out over half-cell systems consisting of LSCF-based materials deposited onto a Ce0.8Gd0.2O2-{\^I}´electrolyte. The improvement of the electrochemical performances of the Ni-doped La0.6Sr0.4Co0.2Fe0.8-0.03Ni0.03O3-{\^I}´sample with respect to a reference Ni-impregnated LSCF is attributed to the stabilization of the TM-O6structural units, which were recently proposed as the functional units for oxygen reduction.",
author = "Antonino Martorana and Fabrizio Puleo and Liotta, {Leonarda Francesca} and Alessandro Longo and {La Parola}, Valeria and {La Parola}, Valeria and Alessandro Longo and Liotta, {Leonarda F.} and Dipanjan Banerjee and Sahle, {Christoph J.} and Fabrizio Puleo and Chiara Cavallari and {Moretti Sala}, Marco",
year = "2018",
language = "English",
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pages = "1003--1013",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
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TY - JOUR

T1 - The Effect of Ni Doping on the Performance and Electronic Structure of LSCF Cathodes Used for IT-SOFCs

AU - Martorana, Antonino

AU - Puleo, Fabrizio

AU - Liotta, Leonarda Francesca

AU - Longo, Alessandro

AU - La Parola, Valeria

AU - La Parola, Valeria

AU - Longo, Alessandro

AU - Liotta, Leonarda F.

AU - Banerjee, Dipanjan

AU - Sahle, Christoph J.

AU - Puleo, Fabrizio

AU - Cavallari, Chiara

AU - Moretti Sala, Marco

PY - 2018

Y1 - 2018

N2 - We investigated the effect of nickel doping on the electronic structure and performance of nanostructured La0.6Sr0.4Co0.2Fe0.8-0.03Ni0.03O3-δprepared by the one-pot sol-gel method. The commercial undoped La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF0.8) was used as reference. Moreover, for comparison, Ni (3 mol %) was deposited by wetness impregnation over the La0.6Sr0.4Co0.2Fe0.8O3-δ. We show by in situ X-ray absorption spectroscopy at 900 °C under air flow that nickel enters the B perovskite site of the material and favors the stabilization of the cobalt oxidation state, as evidenced by the delay in the decrease of the average Co valence with respect to undoped samples. Our results are further supported by in situ X-ray Raman spectroscopy (XRS) that allowed us to monitor the temperature evolution of the O K-edge. XRS evidences that nickel-doped LSCF shows unmodified O2p-TM3d density of states, which proves that the Co oxidation state is preserved. Electrochemical impedance spectroscopy measurements were carried out over half-cell systems consisting of LSCF-based materials deposited onto a Ce0.8Gd0.2O2-δelectrolyte. The improvement of the electrochemical performances of the Ni-doped La0.6Sr0.4Co0.2Fe0.8-0.03Ni0.03O3-δsample with respect to a reference Ni-impregnated LSCF is attributed to the stabilization of the TM-O6structural units, which were recently proposed as the functional units for oxygen reduction.

AB - We investigated the effect of nickel doping on the electronic structure and performance of nanostructured La0.6Sr0.4Co0.2Fe0.8-0.03Ni0.03O3-δprepared by the one-pot sol-gel method. The commercial undoped La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF0.8) was used as reference. Moreover, for comparison, Ni (3 mol %) was deposited by wetness impregnation over the La0.6Sr0.4Co0.2Fe0.8O3-δ. We show by in situ X-ray absorption spectroscopy at 900 °C under air flow that nickel enters the B perovskite site of the material and favors the stabilization of the cobalt oxidation state, as evidenced by the delay in the decrease of the average Co valence with respect to undoped samples. Our results are further supported by in situ X-ray Raman spectroscopy (XRS) that allowed us to monitor the temperature evolution of the O K-edge. XRS evidences that nickel-doped LSCF shows unmodified O2p-TM3d density of states, which proves that the Co oxidation state is preserved. Electrochemical impedance spectroscopy measurements were carried out over half-cell systems consisting of LSCF-based materials deposited onto a Ce0.8Gd0.2O2-δelectrolyte. The improvement of the electrochemical performances of the Ni-doped La0.6Sr0.4Co0.2Fe0.8-0.03Ni0.03O3-δsample with respect to a reference Ni-impregnated LSCF is attributed to the stabilization of the TM-O6structural units, which were recently proposed as the functional units for oxygen reduction.

UR - http://hdl.handle.net/10447/278254

UR - http://pubs.acs.org/journal/jpccck

M3 - Article

VL - 122

SP - 1003

EP - 1013

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

ER -