A fuel cell is an electrochemical device that directly converts the chemical energy of a fuel (like hydrogen) into electrical energy through a redox reaction, without combustion.
Byproduct: Only water (H₂O) — zero pollution.
Efficiency: 70–80% (vs 35–40% for combustion engines).
Famous Use: NASA Apollo spacecraft.
Type: Electrochemical cell (not a battery — fuel is continuously supplied).
The most common fuel cell uses Hydrogen (H₂) as fuel and Oxygen (O₂) as oxidant.
The electrons flow through the external circuit, producing electricity.
A fuel cell is an electrochemical device that converts chemical energy of a fuel directly into electrical energy without burning it.
The only byproduct is water (H₂O), making it completely pollution-free.
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