4.8 Article

(La0.74 Bi0.10Sr0.16)MnO3-δ-Ce0.8Gd0.2O2-δ cathodes fabricated by ion-impregnating method for intermediate-temperature solid oxide fuel cells

Journal

JOURNAL OF POWER SOURCES
Volume 188, Issue 2, Pages 453-457

Publisher

ELSEVIER
DOI: 10.1016/j.jpowsour.2008.12.027

Keywords

Intermediate-temperature solid oxide fuel cells; Composite cathode; Impedance spectroscopy; Ion-impregnation

Funding

  1. Chinese High Technology Development Project [2007AA05ZI51]

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Porous composite cathodes were fabricated by impregnating(La0.74Bi0.10Sr0.16)MnO3-delta (LBSM) electronic conducting structure with the ionic conducting Ce0.8Gd0.2O2-delta (GDC) phase. The ion impregnation of the GDC phase significantly enhanced the electrocatalytic activity of the LBSM electrodes for the O-2 reduction reactions, and the ion-impregnated LBSM-GDC composite cathodes showed excellent performance, At 700 C, the Value of the cathode polarization resistance (Rc) was only 0.097 Omega cm(2) for an ion-impregnated LBSM-GDC cathode, and the performance was gradually improved by increasing the loading of the impregnated GDC. For the performance testing of single cells, the maximum power density was 1036 mW cm (2) at 700 C for a cell with the LRSM-GDC cathode. The results demonstrated the unique combination of the LBSM electronic conducting structure with high ionic conducting GDC phase was a valid method to improve the electrode performance, and the ion-impregnated LBSM-GDC was a promising composite cathode material for the intermediate-temperature solid oxide fuel cells. (C) 2008 Elsevier B.V. All rights reserved.

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