| The phosphoric acid fuel cell - PAFC
The PAFC is the type of fuel cell which has reached the highest stage of technological
and commercial development.
Because it is run at a high operating temperature it is suited perfectly for cogeneration.
Highly concentrated phosphoric acid which is bond in a gel matrix serves as catalyst.
The PAFC requires atmospheric oxygen and hydrogen as reduction gases. One disadvantage
is that the phosphoric acid effloresces irreversibly when temperature sinks below
42°. When this happens the fuel cell becomes unusable. | 
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