Fe-substituted SrTiO_3-δ-Ce_0.9Gd_0.1O₂ composite anodes for solid oxide fuel cells

Journal Article · Wed Jun 05 00:00:00 EDT 2013 · Energy & Environmental Science

DOI:https://doi.org/10.1039/C3EE23791E· OSTI ID:1082522

Cho, Sungmee; Fowler, Daniel E.; Miller, Elizabeth C.; Cronin, J. Scott; Poeppelmeier, Kenneth R.; Barnett, Scott A. ^[1]

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1. NWU

A new composite solid oxide fuel cell anode material, SrTi_1-xFe_xO_3-δ mixed with Gd-doped ceria, was tested in La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ electrolyte-supported cells with La_0.4Ce_0.6O₂ barrier layers and La_0.6Sr_0.4Fe_0.8Co_0.2O₃ cathodes. The x = 0.7 composition had an anode polarization resistance of 0.17 Ω cm², at 800 °C in humidified H₂, much lower than the value 0.39 Ω cm² measured for x = 0.4 and 3.14 Ω cm² for x = 0. The reduced polarization resistance correlated with increased oxygen non-stoichiometry δ, which suggests that it may be related to increased ionic conductivity. Electrochemical impedance spectroscopy (EIS) measurements at 800 °C on the x = 0.7 anode cell showed a main response centered at ~1 Hz that increased with decreasing hydrogen partial pressure. The maximum power density observed was for the x = 0.7 cell – 337 mW cm^-2 at 800 °C in air and humidified hydrogen – and was limited mainly by the thick electrolyte.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
• Sponsoring Organization: NSFDOE - BASIC ENERGY SCIENCES
• OSTI ID: 1082522
• Journal Information: Energy & Environmental Science, Vol. 6, Issue 6; ISSN 1754-5692
• Publisher: Royal Society of Chemistry
• Country of Publication: United States
• Language: ENGLISH