Temperature during cathode fabrication

In order to study cathode flooding in small fuel cells for portable applications operated at ambient conditions, Tuber et al.81 designed a transparent cell that was only operated at low current densities and at room temperature. The experimental data was then used to confirm a mathematical model of a similar cell. Fig. 4 describes the schematic top and side view of this transparent fuel cell. The setup was placed between a base and a transparent cover plate. While the anodic base plate was fabricated of stainless steel, the cover plate was made up of plexiglass. A rib of stainless steel was inserted into a slot in the cover plate to obtain the necessary electrical connection. It was observed that clogging of flow channels by liquid water was a major cause for low cell performance. When the fuel cell operated at room temperature during startup and outdoor operation, a hydrophilic carbon paper turned out to be more effective compared with a hydrophobic one.81... 

The thermal expansion of the cathode should match with other SOFC component materials in order to minimize stresses during cell fabrication and operation. The thermal expansion coefficient (TEC) of undoped LaMnOs is about 11.2 X 10 K in the temperature range 35-1000°C [1,4]. This is only slightly higher than that of YSZ electrolyte, which is... 

In this paper, hydrogenated amorphous silicon thin film transistors (a-Si H TFTs) fabricated on a metal foil substrate is reported for active matrix OLEDs (AMOLEDs) displays. The electrical properties of a-Si H TFTs fabricated on a metal foil substrate are introduced. To increase the stability of a-Si H TFTs fabricated at low temperature on a metal foil substrate, negative bias applied to metal foil substrate can also recover the shifted threshold voltage during idle time. A new cathode-contact structure employing a normal top-emitting OLED, which is suited to n-type a-Si H TFT backplane is proposed. 

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... 

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