GCSE Chemistry (AQA)

196 videos | 19 hours

Fuel Cells

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Energy changes Chemical cells and fuel cells

Fuel Cells

4:26 Reactions at Electrodes in Hydrogen Fuel Cells
Spec 4.5.2.2
Previous Metal Reactivity & Cells Next Fuel Cell Half Equations
  • Fuel cells use an external source of fuel.
  • Hydrogen is typically used as the fuel in these cells.
  • Fuel cells produce a potential difference (voltage).
  • Fuel cells need a constant supply of fuel and oxygen.
  • Hydrogen fuel cells require a constant supply of hydrogen and oxygen.
  • The fuel reacts with oxygen to produce a potential difference, causing an electric current to flow.
  • Fuel cells utilize an electrochemical oxidation process instead of combustion.
  • In hydrogen fuel cells, hydrogen is oxidized to produce water.
  • Hydrogen gas is pumped in on one side, and oxygen gas is pumped in on the other.
  • The chemical equation for the reaction is 2H2 (gas) + O2 (gas) ��� 2H2O (liquid).
  • Hydrogen fuel cells offer a potential alternative to rechargeable cells and batteries.
  • Rechargeable cells require access to electricity to be recharged.
  • Hydrogen fuel cells produce water as their only chemical product, which can be used in drinking water.
  • Hydrogen fuel cells have no moving parts, making them easy to maintain.
  • Disadvantages of hydrogen fuel cells include high manufacturing costs and the need for a constant supply of hydrogen fuel.
  • Hydrogen fuel takes up a large volume and is explosive, requiring high-pressure storage.

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