| The first "modern"
fuel cell Apart from Grove's prototype the alkaline fuel
cell - AFC - was the first type of fuel cell. It was in use,
and still is in use today, for space travel and submarine engines. It
is the only type of fuel cell that requires oxygen and hydrogen in purest form
because even smallest amounts of dirt would destroy the cell. The electrolyte
consists of caustic potash. Today there are AFC available
that can be operated with air. A very good filter is needed to clean the air to
avoid contamination of the fuel cell. | 
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