Question

What are fuel cells?

Answer 1

The galvanic cell in which two energy of combustion of fuels is directly connected into electrical energy Called fuel cell.
Reaction of cell :
Oxidation at anode :
At anode hydrogen gas is oxidized to H₂O.

\[\ce{2H2(g) + 4OH-(aq) -> 4H2O(l) + 4e-}\]

Reduction at cathode (+)
The electrons released at anode travel to cathode through the external circuit.
Here O₂(g) is reduced to `"OH"-`
\[\ce{O2(g) + 2H2O(l) + 4e- -> 4OH- }\]