Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7709719 | International Journal of Hydrogen Energy | 2017 | 9 Pages |
Abstract
We evaluated the electrochemical performances of LaNi0.6Fe0.4O3 (LNFO) and LaNi0.6Co0.4O3 (LNCO) perovskites as cathodes in La0.8Sr0.2Ga0.83Mg0.17O2.815 (LSGM) electrolyte-supported solid oxide fuel cell. Both samples show excellent chemical compatibility with the LSGM electrolyte up to 900 °C, and exhibit small-polaron type electrical conduction with a high conductivity Ï â 510 (430) S·cmâ1 at 800 °C and a small activation energy Eae = 54.9 (44.4) meV for LNFO (LNCO). The oxygen-reduction reaction evaluated in a symmetric LNFO(LNCO)|LSGM|LNFO(LNCO) cell gives a polarization resistance Rp â 0.51 (0.34) Ω·cm2 at 800 °C in air and an activation energy EaO = 1.61 (1.87) eV. For a single cell composed of LNFO (LNCO) cathode, 300-μm-thick LSGM electrolyte, and a composite Ni + Gd-doped ceria anode, the maximum power densities reach Pmax = 490 (650) and 850 (1015) mW·cmâ2 at 800 and 850 °C, respectively. These results demonstrated that LNFO and LNCO are promising cathode materials for the IT-SOFCs.
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Authors
Yan Li, J.W. Cai, José A. Alonso, H.Q. Lian, X.G. Cui, John B. Goodenough,