Chemical Cells & Fuel Cells

5.25C Recall that a chemical cell produces a voltage until one of the reactants is used up
  • Chemical reactions stop when one of the reactants has been used up
5.26C Recall that in a hydrogen-oxygen fuel cell hydrogen and oxygen are used to produce a voltage and water is the only product
  • Supplied by an external source of fuel (eg hydrogen) and oxygen or air
    • Oxidized electrochemically within the fuel cell to produce a potential difference
    • Overall reaction in a hydrogen fuel cell involves the oxidation of hydrogen to produce water
5.27C Evaluate the strengths and weaknesses of fuel cells for given uses
  • Environmental benefit – only water produced
  • Overall has a greater efficiency
  • Rechargeable
  • Expensive
  • Difficulties of transportation and storage of hydrogen