Medium Temperature Cells
In this chapter we shall discuss those types of fuel cell operating at intermediate temperatures, that is to say, temperatures higher than those using aqueous electrolytes at atmospheric pressures but lower than those using solid electrolytes. The range is generally considered to be about 150–300 °C. Some kinds of cell operating in this temperature range have already been mentioned during consideration of aqueous electrolyte cells in chapters 5 and 6. In these particular cells, higher temperatures are possible with pressures only slightly greater than atmospheric because of the considerable boiling point elevation obtained with certain highly concentrated solutions, such as the caesium-rubidium carbonate-bicarbonate mixtures mentioned previously. This variety of cell will not be discussed further.
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