Electrode–Electrolyte Compatibility in Solid-Oxide Fuel Cells: Investigation of the LSM–LNC Interface with X-ray Microspectroscopy

Antonino Martorana, Francesco Giannici, Murielle Salomé, Massimo Viviani, Alessandro Longo, Giovanna Canu

Risultato della ricerca: Article

9 Citazioni (Scopus)

Abstract

Ca:LaNbO4 (LNC) constitutes the last real breakthrough in high-temperature proton conductors, with better chemical and mechanical stability with respect to cerate and zirconate perovskites. However, the low amount of bivalent dopant that can be hosted in the LaNbO4 matrix poses a limit to the proton concentration in the electrolyte. Using synchrotron X-ray microspectroscopy, we investigated the compatibility of annealed LNC/LSM electrolyte/cathode bilayers for proton-conducting SOFCs. The element maps are complemented by microEXAFS and microXANES, giving information on the fate of different cations after diffusion. The X-ray microspectroscopy approach described here is applied for the first time to the study of materials for energy, and it is proposed as a useful structural tool, complementary to electrochemical characterization, for the investigation of the compatibility between materials for SOFCs. We demonstrate that an impressive calcium drift towards the LSM cathode takes place: the dopant is depleted throughout a region of LNC several micrometers wide, causing a decrease of charge carriers in the electrolyte and eventually impairing its conductivity. This poses a significant challenge for evaluating electrolyte/electrode couples in proton-conducting SOFCs based on LNC.
Lingua originaleEnglish
pagine (da-a)2763-2766
Numero di pagine4
RivistaChemistry of Materials
Volume27
Stato di pubblicazionePublished - 2015

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Solid oxide fuel cells (SOFC)
Electrolytes
Protons
X rays
Electrodes
Cathodes
Doping (additives)
Mechanical stability
Chemical stability
Charge carriers
Synchrotrons
Cations
Calcium
Positive ions
Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry
  • Chemical Engineering(all)

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Electrode–Electrolyte Compatibility in Solid-Oxide Fuel Cells: Investigation of the LSM–LNC Interface with X-ray Microspectroscopy. / Martorana, Antonino; Giannici, Francesco; Salomé, Murielle; Viviani, Massimo; Longo, Alessandro; Canu, Giovanna.

In: Chemistry of Materials, Vol. 27, 2015, pag. 2763-2766.

Risultato della ricerca: Article

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abstract = "Ca:LaNbO4 (LNC) constitutes the last real breakthrough in high-temperature proton conductors, with better chemical and mechanical stability with respect to cerate and zirconate perovskites. However, the low amount of bivalent dopant that can be hosted in the LaNbO4 matrix poses a limit to the proton concentration in the electrolyte. Using synchrotron X-ray microspectroscopy, we investigated the compatibility of annealed LNC/LSM electrolyte/cathode bilayers for proton-conducting SOFCs. The element maps are complemented by microEXAFS and microXANES, giving information on the fate of different cations after diffusion. The X-ray microspectroscopy approach described here is applied for the first time to the study of materials for energy, and it is proposed as a useful structural tool, complementary to electrochemical characterization, for the investigation of the compatibility between materials for SOFCs. We demonstrate that an impressive calcium drift towards the LSM cathode takes place: the dopant is depleted throughout a region of LNC several micrometers wide, causing a decrease of charge carriers in the electrolyte and eventually impairing its conductivity. This poses a significant challenge for evaluating electrolyte/electrode couples in proton-conducting SOFCs based on LNC.",
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T1 - Electrode–Electrolyte Compatibility in Solid-Oxide Fuel Cells: Investigation of the LSM–LNC Interface with X-ray Microspectroscopy

AU - Martorana, Antonino

AU - Giannici, Francesco

AU - Salomé, Murielle

AU - Viviani, Massimo

AU - Longo, Alessandro

AU - Canu, Giovanna

PY - 2015

Y1 - 2015

N2 - Ca:LaNbO4 (LNC) constitutes the last real breakthrough in high-temperature proton conductors, with better chemical and mechanical stability with respect to cerate and zirconate perovskites. However, the low amount of bivalent dopant that can be hosted in the LaNbO4 matrix poses a limit to the proton concentration in the electrolyte. Using synchrotron X-ray microspectroscopy, we investigated the compatibility of annealed LNC/LSM electrolyte/cathode bilayers for proton-conducting SOFCs. The element maps are complemented by microEXAFS and microXANES, giving information on the fate of different cations after diffusion. The X-ray microspectroscopy approach described here is applied for the first time to the study of materials for energy, and it is proposed as a useful structural tool, complementary to electrochemical characterization, for the investigation of the compatibility between materials for SOFCs. We demonstrate that an impressive calcium drift towards the LSM cathode takes place: the dopant is depleted throughout a region of LNC several micrometers wide, causing a decrease of charge carriers in the electrolyte and eventually impairing its conductivity. This poses a significant challenge for evaluating electrolyte/electrode couples in proton-conducting SOFCs based on LNC.

AB - Ca:LaNbO4 (LNC) constitutes the last real breakthrough in high-temperature proton conductors, with better chemical and mechanical stability with respect to cerate and zirconate perovskites. However, the low amount of bivalent dopant that can be hosted in the LaNbO4 matrix poses a limit to the proton concentration in the electrolyte. Using synchrotron X-ray microspectroscopy, we investigated the compatibility of annealed LNC/LSM electrolyte/cathode bilayers for proton-conducting SOFCs. The element maps are complemented by microEXAFS and microXANES, giving information on the fate of different cations after diffusion. The X-ray microspectroscopy approach described here is applied for the first time to the study of materials for energy, and it is proposed as a useful structural tool, complementary to electrochemical characterization, for the investigation of the compatibility between materials for SOFCs. We demonstrate that an impressive calcium drift towards the LSM cathode takes place: the dopant is depleted throughout a region of LNC several micrometers wide, causing a decrease of charge carriers in the electrolyte and eventually impairing its conductivity. This poses a significant challenge for evaluating electrolyte/electrode couples in proton-conducting SOFCs based on LNC.

UR - http://hdl.handle.net/10447/126272

UR - http://pubs.acs.org/doi/abs/10.1021/acs.chemmater.5b00142

M3 - Article

VL - 27

SP - 2763

EP - 2766

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

ER -