Fuel cells are galvanic cells which convert heat liberated during burning of H2, methane, methanol direct into electricity. E.g. H2-O2 fuel cell.
In this cell, H2 gas through anode and O2 gas through cathode is bubbled into aq. NaOH solution through carbon electrode.
The electrode reactions are as follows-
Its advantages are - it is highly efficient (70%), pollution free and the biproduct is water.
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