C4.2 Hydrogen-oxygen fuel cells

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Last updated 8:09 PM on 4/7/26
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4 Terms

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How do hydrogen-oxygen fuel cells produce electricity? What is the overall reaction? 

  • They use hydrogen and oxygen to produce electricity, and the only chemical product is water

  • Reaction: 2H2+O2 → 2H2O

2
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Describe the advantages of using hydrogen–oxygen fuel cells in comparison with gasoline/petrol engines in vehicles

  • Advantages of fuel cells:

    • Only water produced (no CO₂).

    • Efficient energy conversion.

    • Renewable hydrogen possible.

3
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Describe the disadvantages of using hydrogen–oxygen fuel cells in comparison with gasoline/petrol engines in vehicles

  • Disadvantages of fuel cells: 

    • Hydrogen storage is difficult and expensive.

    • Hydrogen production may rely on fossil fuels.

    • Fuel cell technology is costly.

4
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