Facilitating oxygen reduction by silver nanoparticles on lanthanum strontium ferrite cathode

Rokas Sažinas*, Kjeld Bøhm Andersen, Kent Kammer Hansen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Single-phase silver (Ag)-doped La0.85-xSr0.15AgxFeO3-δ (x = 0–0.05) materials (LSAF) were synthesized by wet synthesis route and calcined at 800 °C in air. The materials exhibited no thermal degradation in Ar and synthetic air below sintering temperature at 1200 °C of the cathode for solid oxide fuel cells. Exsolution of Ag nanoparticles from the perovskite lattice at 420 °C in reducing 5% H2/N2 was investigated, and electrocatalytic activity of the cathodes towards oxygen reduction reaction for solid oxide fuel cells was demonstrated. Scanning electron microscopy confirmed exsolution of Ag nanoparticles with increased effective surface area, and the particles were distributed with a good contact on the surface of the perovskite. Electrochemical performance of novel materials was tested and compared. Enhanced cathode with Ag nanoparticles revealed the area specific resistance of 0.23 and 0.15 Ω cm2 at 800 °C in 20% O2/N2 before and after Ag exsolution, respectively. The area specific resistance of the cathode decreased with Ag exsolution, operation temperature, and increasing oxygen partial pressure.
Original languageEnglish
JournalJournal of Solid State Electrochemistry
Number of pages13
ISSN1432-8488
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • Silver
  • Exsolution
  • Nanoparticles
  • SOFC
  • Cathode
  • LSF
  • Oxygen reduction reaction

Cite this

@article{0e3a3e9d45e7473781f7373013ad6d8c,
title = "Facilitating oxygen reduction by silver nanoparticles on lanthanum strontium ferrite cathode",
abstract = "Single-phase silver (Ag)-doped La0.85-xSr0.15AgxFeO3-δ (x = 0–0.05) materials (LSAF) were synthesized by wet synthesis route and calcined at 800 °C in air. The materials exhibited no thermal degradation in Ar and synthetic air below sintering temperature at 1200 °C of the cathode for solid oxide fuel cells. Exsolution of Ag nanoparticles from the perovskite lattice at 420 °C in reducing 5{\%} H2/N2 was investigated, and electrocatalytic activity of the cathodes towards oxygen reduction reaction for solid oxide fuel cells was demonstrated. Scanning electron microscopy confirmed exsolution of Ag nanoparticles with increased effective surface area, and the particles were distributed with a good contact on the surface of the perovskite. Electrochemical performance of novel materials was tested and compared. Enhanced cathode with Ag nanoparticles revealed the area specific resistance of 0.23 and 0.15 Ω cm2 at 800 °C in 20{\%} O2/N2 before and after Ag exsolution, respectively. The area specific resistance of the cathode decreased with Ag exsolution, operation temperature, and increasing oxygen partial pressure.",
keywords = "Silver, Exsolution, Nanoparticles, SOFC, Cathode, LSF, Oxygen reduction reaction",
author = "Rokas Sažinas and Andersen, {Kjeld B{\o}hm} and {Kammer Hansen}, Kent",
year = "2020",
doi = "10.1007/s10008-020-04505-5",
language = "English",
journal = "Journal of Solid State Electrochemistry",
issn = "1432-8488",
publisher = "Springer",

}

Facilitating oxygen reduction by silver nanoparticles on lanthanum strontium ferrite cathode. / Sažinas, Rokas; Andersen, Kjeld Bøhm; Kammer Hansen, Kent.

In: Journal of Solid State Electrochemistry, 2020.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Facilitating oxygen reduction by silver nanoparticles on lanthanum strontium ferrite cathode

AU - Sažinas, Rokas

AU - Andersen, Kjeld Bøhm

AU - Kammer Hansen, Kent

PY - 2020

Y1 - 2020

N2 - Single-phase silver (Ag)-doped La0.85-xSr0.15AgxFeO3-δ (x = 0–0.05) materials (LSAF) were synthesized by wet synthesis route and calcined at 800 °C in air. The materials exhibited no thermal degradation in Ar and synthetic air below sintering temperature at 1200 °C of the cathode for solid oxide fuel cells. Exsolution of Ag nanoparticles from the perovskite lattice at 420 °C in reducing 5% H2/N2 was investigated, and electrocatalytic activity of the cathodes towards oxygen reduction reaction for solid oxide fuel cells was demonstrated. Scanning electron microscopy confirmed exsolution of Ag nanoparticles with increased effective surface area, and the particles were distributed with a good contact on the surface of the perovskite. Electrochemical performance of novel materials was tested and compared. Enhanced cathode with Ag nanoparticles revealed the area specific resistance of 0.23 and 0.15 Ω cm2 at 800 °C in 20% O2/N2 before and after Ag exsolution, respectively. The area specific resistance of the cathode decreased with Ag exsolution, operation temperature, and increasing oxygen partial pressure.

AB - Single-phase silver (Ag)-doped La0.85-xSr0.15AgxFeO3-δ (x = 0–0.05) materials (LSAF) were synthesized by wet synthesis route and calcined at 800 °C in air. The materials exhibited no thermal degradation in Ar and synthetic air below sintering temperature at 1200 °C of the cathode for solid oxide fuel cells. Exsolution of Ag nanoparticles from the perovskite lattice at 420 °C in reducing 5% H2/N2 was investigated, and electrocatalytic activity of the cathodes towards oxygen reduction reaction for solid oxide fuel cells was demonstrated. Scanning electron microscopy confirmed exsolution of Ag nanoparticles with increased effective surface area, and the particles were distributed with a good contact on the surface of the perovskite. Electrochemical performance of novel materials was tested and compared. Enhanced cathode with Ag nanoparticles revealed the area specific resistance of 0.23 and 0.15 Ω cm2 at 800 °C in 20% O2/N2 before and after Ag exsolution, respectively. The area specific resistance of the cathode decreased with Ag exsolution, operation temperature, and increasing oxygen partial pressure.

KW - Silver

KW - Exsolution

KW - Nanoparticles

KW - SOFC

KW - Cathode

KW - LSF

KW - Oxygen reduction reaction

U2 - 10.1007/s10008-020-04505-5

DO - 10.1007/s10008-020-04505-5

M3 - Journal article

JO - Journal of Solid State Electrochemistry

JF - Journal of Solid State Electrochemistry

SN - 1432-8488

ER -