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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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F
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Fuel_cell
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1992-09-03
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19 lines
Cell converting chemical energy directly to
electrical energy. It works on the same
principle as a battery but is continually fed
with fuel, usually hydrogen. Fuel cells are
silent and reliable (no moving parts) but
expensive to produce. Hydrogen is passed over
an electrode (usually nickel or platinum)
containing a catalyst, which strips electrons
off the atoms. These pass through an external
circuit while hydrogen ions (charged atoms)
pass through an electrolyte to another
electrode, over which oxygen is passed. Water
is formed at this electrode (as a byproduct)
in a chemical reaction involving electrons,
hydrogen ions, and oxygen atoms. If the spare
heat also produced is used for hot water and
space heating, 80% efficiency in fuel is
achieved.