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'''Hydrogen can be used as fuel''' in both [[internal combustion engine]]s aswell as [[hydrogen fuel cell]]s. It can be produced using a [[chemical process]] or a [[biological process]] (most commonly from waste organic materials -ie using [[algae]], [[bacteria]] or archaea- ).<ref>Demirbas, A. (2009). Biohydrogen: For Future Engine Fuel Demands. Trabzon: Springer. ISBN 1-84882-510-2</ref>.
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'''Hydrogen can be used as fuel''' in both [[internal combustion engine]]s as well as [[hydrogen fuel cell]]s. It can be produced using a [[chemical process]] or a [[biological process]] (most commonly from waste organic materials -ie using [[algae]], [[bacteria]] or archaea- ).<ref>Demirbas, A. (2009). Biohydrogen: For Future Engine Fuel Demands. Trabzon: Springer. ISBN 1-84882-510-2</ref>.
    
==Hydrogen overview==
 
==Hydrogen overview==
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The first method requires very high temperatures, ie (700–1100°C) and thus a huge amount of energy is needed for the heating. It also requires the possession of syngas, which itself needs to be made from something (ie coal, using the coal gasification process or methane or syngas, using the steam reforming process).
 
The first method requires very high temperatures, ie (700–1100°C) and thus a huge amount of energy is needed for the heating. It also requires the possession of syngas, which itself needs to be made from something (ie coal, using the coal gasification process or methane or syngas, using the steam reforming process).
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Electrolysis of water is the simplest process. Little equipment is needed for it but ,it is however not very energy-efficient. See [[ICE fuel generator#Hydrogen]]
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Electrolysis of water is the simplest process. Little equipment is needed for it but it is not very energy-efficient. See [[ICE fuel generator#Hydrogen]] and [[Hydrogen_station#Hydrogen_home_stations]]
    
===Using a biological process===
 
===Using a biological process===
 
[[File:Microbial_electrolysis_cell.png|thumb|right|200px|(Bio)hydrogen made from waste plant parts]]
 
[[File:Microbial_electrolysis_cell.png|thumb|right|200px|(Bio)hydrogen made from waste plant parts]]
Waste plant parts can be converted to hydrogen using microorganisms. See the image on the right.
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Waste plant parts can be converted to hydrogen using microorganisms in a [[Microbial electrolysis cell]]. One the hydrogen is produced, it is best to immediatelly generate electricity from it using a additional PEM fuel cell or IC engine. This, as hydrogen is very hard to store. See the image on the right.
    
==Hydrogen storage==
 
==Hydrogen storage==
 
[[File:Hydrogen_(fuel cell)_energy_storage.png|thumb|right|200px|Hydrogen fuel cell energy storage]]
 
[[File:Hydrogen_(fuel cell)_energy_storage.png|thumb|right|200px|Hydrogen fuel cell energy storage]]
 
[[File:Hydrogen_(ICE)_energy_storage.png|thumb|right|200px|Hydrogen ICE energy storage]]
 
[[File:Hydrogen_(ICE)_energy_storage.png|thumb|right|200px|Hydrogen ICE energy storage]]
Hydrogen is very difficult to store. It requires either a huge amount of cooling or pressurisation. As such, it requires expensive equipment (compressors, coolers, very sturdy tanks). In addition, hydrogen (being a very small atom) has the annoying tendency to leak trough just about anything (dissapation), given enough time. To increase the shelf life, the storage tanks are often made of exotic (and thus expensive) materials.
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Hydrogen is very difficult to store. It requires either a huge amount of cooling or pressurisation. As such, it requires expensive equipment (compressors, coolers, very sturdy tanks). In addition, hydrogen (being a very small atom) has the annoying tendency to leak through just about anything (dissapation), given enough time. To increase the shelf life, the storage tanks are often made of exotic (and thus expensive) materials.
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In general, due to the very expensive equipment -aswell as energy use- required, hydrogen is not suitable for medium or long term energy storage. Rather, it is best used almost immediatelly after production. This way, simple tanks can be used and pressurization/cooling can be either eliminated or kept to a minimum.
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In general, due to the very expensive equipment -as well as energy use- required, hydrogen is not suitable for medium or long term energy storage. Rather, it is best used almost immediatelly after production. This way, simple tanks can be used and pressurization/cooling can be either eliminated or kept to a minimum.
    
An other method is to convert hydrogen to another fuel. It can be converted to ie [[syngas]] or [[methane]] (the last is done using the Sabatier process which combines hydrogen with CO²). Methane is a lot easier to store and thus avoids a huge amount of the problems for medium/long-term storage. Syngas however has similar storage problems as hydrogen and convertion to this fuel hence does not solve any problems.
 
An other method is to convert hydrogen to another fuel. It can be converted to ie [[syngas]] or [[methane]] (the last is done using the Sabatier process which combines hydrogen with CO²). Methane is a lot easier to store and thus avoids a huge amount of the problems for medium/long-term storage. Syngas however has similar storage problems as hydrogen and convertion to this fuel hence does not solve any problems.

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