Question

Define fuel cell and write its two advantages.

Answer 1

The galvanic cells in which the energy of combustion of fuels is directly converted into electrical energy are called fuel cells. One of the reactants is fuel such as hydrogen or methanol. The reactants are not placed within the cell but they are continuously supplied to the electrodes from the reservoir.
Advantages:
(1) The reactants are continuously supplied to the electrodes from the reservoir. Unlike conventional cells, the fuel cells do not have to be discharged when the chemicals are consumed.
(2) They are non polluting because the only reaction product is water (for hydrogen-oxygen fuel cell).