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• W2952930003 abstract "RBa(Co,M)4O7 (R = Y, Ca, In and M = Zn, Fe, Al) oxides with a hexagonal structure and corner-shared (Co,M)O4 tetrahedra have been synthesized and investigated as cathode materials for solid oxide fuel cells (SOFC). Among the various compositions investigated, YBaCo4−xZnxO7 (1 ≤ x ≤ 2) shows long-term stability at high temperatures. Thermal expansion coefficient (TEC) values of the RBa(Co,M)4O7 specimens were determined to be 6 × 10−6 to 13 × 10−6 oC−1 in the range of 80−900 °C, which provides good thermal expansion compatibility with the standard SOFC electrolyte materials. The low TEC is attributed to the absence of spin state transitions of tetrahedral-site Co2+/3+ ions and relatively small amount of oxygen loss with increasing temperature. The YBaCo3ZnO7 + GDC composite cathodes exhibit low polarization resistance and good fuel cell performance comparable to that of well-studied Co-based perovskite cathodes, but with the critical advantage of an ideal matching of the TEC value with those of standard electrolytes." @default.
• W2952930003 created "2019-06-27" @default.
• W2952930003 creator A5066705036 @default.
• W2952930003 creator A5088783484 @default.
• W2952930003 date "2009-08-27" @default.
• W2952930003 modified "2023-10-11" @default.
• W2952930003 title "Low Thermal Expansion RBa(Co,M)₄O₇ Cathode Materials Based on Tetrahedral-Site Cobalt Ions for Solid Oxide Fuel Cells" @default.
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• W2952930003 doi "https://doi.org/10.1021/cm9015244" @default.
• W2952930003 hasPublicationYear "2009" @default.
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