Question detail
Explain why hydrogen fuel cells can be considered as an alternative to rechargeable cells and batteries.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Chemical cells and fuel cells (chemistry only)
Question
Explain why hydrogen fuel cells can be considered as an alternative to rechargeable cells and batteries.
Answer
Hydrogen fuel cells can be considered an alternative because they produce electricity through the oxidation of hydrogen, generating only water as a byproduct. Unlike rechargeable batteries, which require recharging after use, hydrogen fuel cells can continuously generate power as long as fuel is supplied.
Explanation
This answer highlights the advantages of hydrogen fuel cells over traditional rechargeable batteries, focusing on their operational efficiency and environmental benefits. It tests the student's ability to compare different energy storage technologies.
Common mistake
Oxygen half‑reaction mis‑written
Students often write the oxygen electrode half‑reaction as O₂ + 4e⁻ → 2O²⁻ instead of the correct form involving water and protons
The correct oxygen half‑reaction in a hydrogen fuel cell is O₂ + 4H⁺ + 4e⁻ → 2H₂O (or, in alkaline solution, O₂ + 2H₂O + 4e⁻ → 4OH⁻). Ensure the reaction includes the appropriate protons or hydroxide ions and produces water, not oxide ions.
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