# What Are Fuel Cells? - Chemistry

Short Note

What are fuel cells?

#### Solution

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"-
$\ce{O2(g) + 2H2O(l) + 4e- -> 4OH- }$

Concept: Electrochemical Cells
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