Question detail
What is the main advantage of using hydrogen fuel cells over traditional batteries?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Chemical cells and fuel cells (chemistry only)
Question
- A. Higher energy density
- B. Lower cost
- C. Easier to recycle
- D. More complex technology
Answer
Higher energy density
Explanation
Hydrogen fuel cells typically have a higher energy density compared to traditional batteries, allowing them to store more energy for the same weight.
Common mistake
Misidentifying the Oxidation Step
Students often think the fuel (hydrogen) is reduced at the anode and the oxygen is oxidised at the cathode, confusing the direction of electron flow in a fuel cell.
In a hydrogen fuel cell, the fuel (hydrogen) is oxidised at the anode (H₂ → 2H⁺ + 2e⁻) and the oxygen is reduced at the cathode (O₂ + 4H⁺ + 4e⁻ → 2H₂O). The oxidation of hydrogen is the electrochemical reaction that generates electrons, not the reduction of oxygen.
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