CBSE Class 12 · 2006 · All India Compartment · Redox Reactions and ElectrochemistryShort Answer

What are fuel cells? Write the electrode reactions of a fuel cell which uses the reaction of hydrogen with oxygen.

Solution

Fuel cells are galvanic cells in which the chemical energy of a continuously supplied fuel (and oxidant) is converted directly into electrical energy.
H

_{2}

–O

_{2}

fuel cell (in aqueous KOH):
Anode:

2 H_{2} (g) + 4 O H^{-} (a q) ⟶ 4 H_{2} O (l) + 4 e^{-}

Cathode:

O_{2} (g) + 2 H_{2} O (l) + 4 e^{-} ⟶ 4 O H^{-} (a q)

Overall:

2 H_{2} + O_{2} ⟶ 2 H_{2} O

CBSE Class 12 Board · 2006 · All India Compartment · Subjective

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