CH-726
Hydrogen fuel cells
Chemistry · Secondary 3 · Hard · Hydrogen fuel cells
A car is powered by a hydrogen–oxygen fuel cell. After some time, the hydrogen tank becomes empty while oxygen is still available from the air. What happens to the current produced by the fuel cell, and why?
- It falls to zero because no more hydrogen is available to be oxidised.
- It stays the same because oxygen alone can keep the reaction going.
- It increases because the cell now converts water back into hydrogen.
- It slowly increases because the fuel cell recharges itself like a battery.
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