LSCF cells, electrochemical performance

FIGURE 4.9 Electrochemical performance of the LSCF cells tested with various raw chro-mia-forming metal meshes. Performance of the LSCF cell tested with no mesh was also plotted for comparison [203],... 

From these results, it vras concluded that the electrochemical performance of the as-prepared single cells with an 8YSZ electrolyte fabricated from a sol-gel route was lower than that of the State-of-the-Art FZJ-type cells, which had a mean current density value of around 1800 mA/cm at 700 mV cell voltage and at a test temperature of 1073 K. There might be three reasons for the limited electrochemical performance. First of all, the cathode was partly delaminated during the cell test. Secondly, the pores in the top electrolyte layers resulted in incomplete contacts with the intermediate electrolyte layers (Figure 5b). The last and most important reason was the diffusion of Strontium (Sr) from the LSCF cathode into the electrolyte during the operation of electrochemical... 

Dense electrolytes with a thickness of 3 pm have been deposited on warm-pressed anode substrates by a graded multi-layer sol-gel coating method. By applying a LSCF cathode, current density of about 840 mA/cm and power density of 588 mW/cm has been realized. It could be demonstrated that it is possible to produce highly dense YSZ electrolyte for SOFC application via sol-gel route. Enhanced electrochemical performances of single cells are expected in the future work through optimizations of fabrication procedures. 

Lu, Z Zhou, X.-D., Templeton, J., and Stevenson, J.W. (2010) Electrochemical performance and stability of the cathode for solid oxide fuel cells. IV. On the ohmic loss in anode-supported button cells with LSM or LSCF cathodes. /. Electrochem. Soc., 157 (6), B964-B969. 

A SEM micrograph of the cathode/electrolyte interface and preliminary results on the electrochemical activity of YSZ electrolyte-supported SOFCs containing Ni-YSZ anode and a LSCF-SDC composite cathode are shown in Fig. 14. As it can be seen in Fig. 14(a), the composite film not only has good adhesion to the electrolyte, but also possesses a porous microstructure which is required for the oxidant electrochemical reduction. It indicates that such a composite film can have a good performance as SOFC cathode. By the LSV technique, qualitative information about electrochemical activity of this SOFC was acquired. The power density curves (Fig. 14b) revealed that maximum power densities were 19, 26, 36 and 46 mW/cm2 at 800, 850, 900 and 950 °C. It is possible to compare these first results with literature data and safely state that the LSCF-SDC cathode composite is qualitatively better than other plain standard materials or cathode composites already reported. It should also be mentioned that the result obtained at 800 °C is similar to that reported by Mucdllo et al (Mucdllo et al., 2006) for a SOFC single cell with LSM-YSZ cathode, Ni-YSZ anode and 70 pm... 

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