Energy Transfers-Fuel Cells-C6

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  • Energy Transfers-Fuel Cells
    • Fuel cell advantages in space
      • Produce water for astronauts
      • No moving parts, lightweight
    • Fuel cell advantages/ disadvantage-s
      • Efficient, direct energy transfer, less pollution
      • Poisonous catalysts, fossil fuels burnt to gain hydrogen and oxygen
    • Exothermic reaction: 2H2+O2 ---> 2H2O
      • Chemical energy given out as heat. A fuel cells converts the energy directly (no heat)
      • Electrons exchanged at the cathode to the anode
    • Oxidation: 2H2 ---> 4H+ +4e
      • Reduction: 4H+ + O2 + 4e- ---> 2H2O
        • Electrons gained and lost-redox reaction
          • Oxidation: 2H2 ---> 4H+ +4e
            • Reduction: 4H+ + O2 + 4e- ---> 2H2O
              • Electrons gained and lost-redox reaction

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