Unit 3: Secondary Fuels - Hydrogen

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  • Secondary Fuels - Hydrogen
    • Generation - Electrolysis of Water
      • Electricity introduced to water through anode (+) and cathode (-)
      • +ve charged hydrogen ions attracted to cathode
      • -ve charged oxygen attracted to anode
    • Hydrogen Storage
      • Compressed gas (energy used to run compressor)
      • Liquefied under high pressure and low temperature (energy used to run compressor and refrigerator)
      • Metal hydrides - absorbs onto metal matrix surface at low pressure (storage tanks large and heavy)
      • Ammonia - treated with catalyst to release gas
      • Fuel cells - hydrogen flows into anode and splits, ectrons forced through a circuit, creating a electric current
    • Advantages
      • No harmful emissions
      • Can be stored
      • Can be used when there is a surplus of energy (hydrogen economy)
      • Readily available
      • High energy density
      • Renewable
    • Disadvantages
      • Hard to transport
      • Expensive - technology not fully developed
      • Highly flammable
      • Not easy to replace existing infrastructure

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