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ZCi/e S'stcms 7Nc. 4. Short-term testing has shown that cell voltage can be reduced by using a different electrode catalyst and cell matrix. A catalyst which was2 tested for 100 hours produced a 34 mV lower cell voltage at 215 mA/cm (100 ASF). A cell matrix which wa tested for 100 hours produced a 58 mV lower cell voltage at 215 mA/cm (200 ASF) and has better high temperatures characteristic than the standard matrix. Higher temperature will further reduce cell voltage. 5. The SFWEM can be operated with liquid cooling and better performance obtained. This was demonstrated on the program's endurance test with the narrow cell voltage distribution of ±25 mV for more than 1800 hours. 6. A single SFWEM cell can be run at current densities up to 1076 mA/cm2 (1000 ASF) for short periods as was demonstrated during the SFWEM single cell DVTs. 7. The SFWEM can be operated at pressures up to 1724 kN/m2 (250 psia) as was demonstrated during parametric and2endurance tests. The voltage increasesatarateof0.6mVperkN/m (4.1mVgerpsia)overthe range 690 to 1725 (100 to 250 psia) at 215 mA/cm (200 ASF) and approxi- mately 342K (155F). 8. The SFWEM demonstrated a 2.6 mV/K 1.4 mV/F) decrease in cell voltage over2the range of 108 to 538 mA/cm (100 to 500 ASF), and 101 to 207 kN/m (14.7 to 30 psia), and 316 to 366K (110 to 200F). 9. Operation under a typical near-earth orbit duty cycle was successful and can result in a projected weight savings of 185Kg (405 lb) for a six-man 02 Generating Subsystem, assuming a 122 kg/kw (270 lb/kw) power penalty for the cyclic mode and 268 kg/kw (590 lb/kw) for continuous regulated DC power source. 10. The Leed water supply tank can be automatically refilled from a 207 kN/m2 (30 psia) water supply while the SFWEM was operating at 1724 kN/m (250 psia). This automatic water tank filling was controlled by automatic circuits in the control instrumentation and was demonstrated during the endurance test. 11. A DM can be used to remove moisture from the SFWEM product gases, eliminating the need for condenser/separator and converting nearly all of the water to product gases. This was demonstrated during short- term integrated SFWEM-DM tests. The following recommendations are a result of this development program: 1. Operation of a single cell at current densities up to 1076 mA/cm2 (1000 ASF) was demonstrated. The limiting factor in the SFWEM is the current collection components. The SFWEM should2be modified to allow operations at current densities up to 1076 mA/cm (1000 ASF). This modification would require redesign of the current collectors, intercell and intracell current flow paths. 78PDF Image | WATER ELECTROLYSIS MODULE
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