Question
What are fuel cells? Write the reaction of a oxygen hydrogen fuel cell.
Solution
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 )
