Fuel Cells (AQA A-Level Chemistry): Flashcards

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Fuel Cells
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What do fuel cells generate?

Electric current from redox reactions

Key advantage of fuel cells over batteries

No need for recharging with continuous fuel supply

Common fuel used in fuel cells

Hydrogen

Waste product of alkaline H2\text{H}_2-O2\text{O}_2 fuel cell

Water

Anode reaction in alkaline fuel cell

H2+2OH−→2H2O+2e−\text{H}_2 + 2\text{OH}^- \rightarrow 2\text{H}_2\text{O} + 2e^-

Cathode reaction in alkaline fuel cell

O2+2H2O+4e−→4OH−\text{O}_2 + 2\text{H}_2\text{O} + 4e^- \rightarrow 4\text{OH}^-

Overall reaction in H2\text{H}_2-O2\text{O}_2 fuel cell

2H2+O2→2H2O2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}

Efficiency of fuel cells vs combustion engines

Fuel cells are more efficient

Issue with hydrogen production for fuel cells

Often relies on fossil fuels (electrolysis)

Safety concern with hydrogen fuel

Highly flammable

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