GCSE Chemistry Revision — Fuel Cells
Revise Fuel Cells for GCSE Chemistry with a topic explanation, worked example and common mistakes. Check the board notes for specification differences.
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What is Fuel Cells?
A fuel cell is an electrochemical cell that generates electricity through a chemical reaction between a fuel (like hydrogen) and an oxidant (like oxygen). Unlike conventional batteries, they do not run down or need recharging; they produce electricity as long as fuel is supplied. The only product of a hydrogen-oxygen fuel cell is water.
Board notes: Fuel cells are a modern application of electrochemistry and are covered by all exam boards, usually as part of the energy or electrolysis topics. You should be able to compare them to conventional fuels and batteries and discuss their advantages and disadvantages.
Step-by-step explanationWorked examples
Worked example
In a hydrogen-oxygen fuel cell, hydrogen is fed to the anode and oxygen to the cathode. At the anode, hydrogen is oxidised (H₂ → 2H⁺ + 2e⁻). The H⁺ ions move through the electrolyte to the cathode, where they react with oxygen and electrons to form water (O₂ + 4H⁺ + 4e⁻ → 2H₂O). The flow of electrons from anode to cathode creates an electric current.
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Start with low-focus cards for Fuel Cells, then move into full exam-style practice when you want the heavier session.
Common mistakes
- 1Confusing fuel cells with batteries. Fuel cells require a continuous external supply of fuel, whereas batteries have a finite amount of stored chemical energy.
- 2Thinking that fuel cells are a source of energy. They are energy conversion devices, transforming chemical energy into electrical energy.
- 3Ignoring the practical challenges of using hydrogen as a fuel, such as its storage and the fact that its production often requires energy from fossil fuels.
Fuel Cells exam questions
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Frequently asked questions
What are the advantages of fuel cells?
Fuel cells are highly efficient, produce no polluting gases (the only product is water), and can be made in a range of sizes. They are also quiet and have no moving parts.
What are the disadvantages of fuel cells?
The main disadvantages are the high cost of the catalysts (often platinum) and the difficulty and expense of producing and storing the hydrogen fuel safely.