Fuel cell: A galvanic cell in which the reactants are continuously fed into the cell and the products are continuously removed is called a fuel cell.
The most important fuel cell is hydrogen oxygen fuel cell.
The reactions taking place in this fuel cell are
Cathode: O2(g) + 2H2O(l) + 4e–--->4OH–(aq)
Anode: 2H2 (g) + 4OH–(aq)---> 4H2O(l) + 4e–
Overall reaction being:
2H2(g) + O2(g) ---> 2H2O(l )
= 1.05 V – 0.0295 x log 80
= 1.05 V – 0.0295 x 1.9031
= 1.05 V – 0.056 = 0.99 V.