Fuel cells
Fuel cells
Formula
2H₂ + O₂ → 2H₂O
Real World
Toyota's Mirai car uses a hydrogen fuel cell that reacts H₂ from an onboard tank with atmospheric O₂ to generate electricity directly, emitting only water vapour from the exhaust.
Exam Focus
Write separate half-equations for anode and cathode; 'evaluate' questions require both efficiency advantage and hydrogen storage limitation.
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