Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 18, Issue 36, Pages 4341-4346Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b808162j
Keywords
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Funding
- Natural Sciences and Engineering Research Council
- Versa Power Systems Limited
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Composite cathodes of Cu(1.25)Mn(1.75)O(4) (CMO) spinel and yttria stabilized zirconia (YSZ) were made by infiltration of a precursor Cu-Mn gel into a porous YSZ matrix. Structural characterization showed no evidence of secondary phases but revealed a continuous network of CMO in the YSZ framework. Impedance spectroscopy and overpotential measurements revealed that the CMO-YSZ composite cathode had better electrochemical performance than the traditional LSM-YSZ cathode between 650 and 800 degrees C. A 50 wt% CMO impregnated YSZ cathode had a polarization resistance of 0.3 Omega cm(2) at 750 degrees C, compared to 8.5 Omega cm(2) for LSM-YSZ. Further investigation showed that charge transfer is the probable rate determining step for oxygen reduction in the CMO-YSZ cathode above 750 degrees C.
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