What is the basis of working of a fuel cell?

Fuel Cells

What are fuel cells ? Explain the electrode reactions involved in the working of H_(2) - O_(2) fuel cell.

(a) What are fuel cells ? Explain the electrode reactions involved in the working of H_(2)-O_(2) fuel cell. (b) Represent the galvanic cell in which the reaction Zn(s) + Cu^(2)(aq) to Zn^(2+) (aq) + Cu(s) takes place.

The reaction occuring in fuel cell is