La2−xPrxNiO4+δ as suitable cathodes for metal supported SOFCs

La2−xPrxNiO4+δ as suitable cathodes for metal supported SOFCs Aiming at a tradeoff between the chemical stability of La2NiO4+δ (LNO) and the high electrochemical performances of Pr2NiO4+δ (PNO), La2−xPrxNiO4+δ mixed nickelates, further referred as LPNO, were studied as possible oxygen electrodes for solid oxide fuel cells (SOFCs). LPNO phases were synthesized using the modified citrate–nitrate route followed by a heat treatment at 1200°C for 12h under air. Structural characterizations of those K2NiF4-type compounds show the existence of two solid solutions with orthorhombic structure, namely a La-rich one from x=0 to 0.5 with Fmmm space group, and a Pr-rich one from x=1.0 to 2.0 with Bmab space group. The mixed ionic and electronic conducting (MIEC) properties of LPNO phases were investigated through the evolution of the oxygen over-stoichiometry, δ, measured as a function of temperature and pO2, the electrical conductivity, the diffusion and surface exchange coefficients versus x, showing that all compositions exhibit suitable characteristics as cathode materials for SOFCs. In particular, the electrochemical performances measured in symmetrical cells using LPNO materials sintered under low pO2, as requested in metal supported cell, (MSC-conditions) confirmed a decrease in polarization resistance values, Rp, from 0.93Ωcm2 (LNO) down to 0.15Ωcm2 (PNO) at 600°C with increasing x. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Solid State Ionics Elsevier

La2−xPrxNiO4+δ as suitable cathodes for metal supported SOFCs

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0167-2738
eISSN
1872-7689
D.O.I.
10.1016/j.ssi.2015.05.005
Publisher site
See Article on Publisher Site

Abstract

Aiming at a tradeoff between the chemical stability of La2NiO4+δ (LNO) and the high electrochemical performances of Pr2NiO4+δ (PNO), La2−xPrxNiO4+δ mixed nickelates, further referred as LPNO, were studied as possible oxygen electrodes for solid oxide fuel cells (SOFCs). LPNO phases were synthesized using the modified citrate–nitrate route followed by a heat treatment at 1200°C for 12h under air. Structural characterizations of those K2NiF4-type compounds show the existence of two solid solutions with orthorhombic structure, namely a La-rich one from x=0 to 0.5 with Fmmm space group, and a Pr-rich one from x=1.0 to 2.0 with Bmab space group. The mixed ionic and electronic conducting (MIEC) properties of LPNO phases were investigated through the evolution of the oxygen over-stoichiometry, δ, measured as a function of temperature and pO2, the electrical conductivity, the diffusion and surface exchange coefficients versus x, showing that all compositions exhibit suitable characteristics as cathode materials for SOFCs. In particular, the electrochemical performances measured in symmetrical cells using LPNO materials sintered under low pO2, as requested in metal supported cell, (MSC-conditions) confirmed a decrease in polarization resistance values, Rp, from 0.93Ωcm2 (LNO) down to 0.15Ωcm2 (PNO) at 600°C with increasing x.

Journal

Solid State IonicsElsevier

Published: Oct 1, 2015

References

  • J. Power Sources
    Tucker, M.C.; Lau, G.Y.; Jacobson, C.P.; DeJonghe, L.C.; Visco, S.J.
  • J. Power Sources
    Tucker, M.C.; Lau, G.Y.; Jacobson, C.P.; DeJonghe, L.C.; Visco, S.J.

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