Unit 3: Secondary Fuels - Hydrogen
- Created by: rosieevie
- Created on: 09-01-15 17:46
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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
- Generation - Electrolysis of Water
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