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What do fuel cells use and why?
A fuel and oxygen from the air to generate a potential difference.
How do hydrogen fuel cells generate electricity?
From hydrogen and oxygen.
What’s the overall reaction for hydrogen fuel cells?
2H₂ + O₂ → 2H₂O
Why is the hydrogen oxidised?
To produce water.
Name a different type of hydrogen fuel cell?
Alkaline fuel cells
Name a half equation for alkaline fuel cells: (1)
2H₂ + 4OH⁻ → 4H₂O + 4e⁻
Name a half equation for alkaline fuel cells: (2)
O₂ + 2H₂O + 4e⁻ → 4OH⁻
Name 2 advatages for using hydrogen fuel cells:
The only waste is water and don’t need to be electrically recharged.
Name 2 disadvantages for using hydrogen fuel cells:
Hydrogen’s highly flammable and difficult to store and hydrogen is often produced from non-renewable resources.
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