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As part of the present program, a potentially non-corrosive substrate for the catalyst was evaluated with a projected test goal of 30 days of operation. The new electrode was designated WAB-S. After approximately two days of running, as shown in Figure -17, the performance started to degrade rapidly. The test was therefore terminated. A decision was made to continue the single cell test using an advanced anode (WAB-6) that had been developed under a company-funded activity. Figure 18 shows cell voltage versus current density plots for the WAB-6 electrode at three different operating life times. Endurance test results for the 30 days of scheduled operation are shown in Figure 19. Table 10 lists the shutdown and causes for the 30-day test. Figure 20 and Table 11 show a comparison of this WAB-6 elejtrgde2 rgformance with that of other electrodes previously developed by LSI I Excellent competitive cell voltage levels at elevated current densities were demonstrated with the WAB-6 electrode. SFWE Single Cell 30-Day High Temperature Test Water electrolysis performance has a strong dependence on temperature. As the temperature increases, the power required for the cell to produce the product H and 02 gases is reduced For actual hardware, this temperature dependence is generally on the order of 4.3 mV decrea 1 er degree K rise in temperature over a range of 295 to 354K (72 to 178F) T?2 To accomplish high temperature, low power SFWES operation requires that the baseline fuel cell grade asbestos matrix be replaced with a material that is compatible with KOH at the greater than 366K (200F) temperature. A matrix constructed from potassium titinate (PKT) fibers was identified, tried, found acceptable and selected to conduct a 30-day high temperature (366K (200F)) single cell test. For best performance the cell was constructed using the new WAB-6 anode with other components being baseline. Figure 21 shows current density spans performed with the high temperature cell at start-up and after 48 hours of operation. A comparison with the performance using baseline asbestos at 355K (180F) and using PKT fibers at 366K (200F) shows little advantage for the high temperature operation using the new matrix material. Also, in recent conversations with the supplier for PKT fibers, it was found that this product will no longer be produced. This means the material identified under the task will not fit the long-term availability needs. A search to identify suitable alternate sources and/or materials proved unsuccessful. As a result, the need for the high temperature (greater than 366K (200F)) SFWES operation was reevaluated. Recent advances in LSI's electrode t~chnology haveshownthatvoltagesbelow1.5Vandacurrentdensityof161mA/cm (150 ASF) are possible while operating at temperatures of up to 355K (180F) and using fuel cell grade asbestos (see Figure 18). Cells operating at these low cell voltages produce very little waste heat, making high temperature operation (above 355K (iSOF)) and low cell voltages incompatible for a practical OGS This is due to the fact that the cells do not generate sufficient heat and, 42 LieSstems, Jnc.PDF Image | STATIC FEED WATER ELECTROLYSIS PROCESS
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