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Li/cSstems, JiNc. Electrolyte An alkaline electrolyte was selected for the SFWEM because materials problems and power requirements are less than with comparable acid systems. An aqueous solution of potassium hydroxide (KOH) was selected because of its high conductivity and water vapor pressure depressant characteristics. The concentration at which the module was charged was selected to provide an optimum compromise among the factors of water vapor contained in the product gases, electrolyte conductivity needed for efficient high current density operation without electrolyte precipi- tation and minimization of the dissolution of gases from the feed water. Electrolyte Incorporation The electrolyte was incorporated in a porous matrix made from custom-blended matrix material to: 1. Avoid quantities of bulk electrolyte within the system for increased safety and lower equivalent weight. 2. Avoid the need for an electrolyte circulating pump. 3. 4. S. Water Feed Keep the feed water separated from the cell electrolyte and electrodes for increased operating life by avoiding contamination due to possible impurities contained in the feed water. Keep the cell electrodes close together for low internal resistance, hence low equivalent weight. Provide a higher stability to pressure differentials impossible with standard fuel cell asbestos matrices. uses a static water addition concept. This method of water addition is preferred because it is simple, reliable and minimizes subsystem components and controls. It enables keeping the feed water separated from the cell electro- lyte and minimizes the amount of bulk liquid electrolyte present in a water electrolysis system. This concept also provides for a way of avoiding aerosol formation by allowing accurate control of the cell's moisture level. Heat Removal A liquid coolant loop circulating through separate cooling compartments within each cell of the SFWEM was selected to remove the waste heat generated by the electrochemical reaction. Past static feed systems have used evaporative cooling concepts or aircooled external fins. Evaporative cooling techniques prevented positive module temperature control while also being incompatible with high pressure operation. Modules cooled with ambient air are simple in construction, but are generally bigger and heavier and have current density limitations due to increased thermal gradients. The SFWEM 6PDF Image | WATER ELECTROLYSIS MODULE
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