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Energy storage: Difference between revisions
→Hydrogen gas
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===Hydrogen gas=== | ===Hydrogen gas=== | ||
[[Hydrogen gas]] does not occur in nature, but can be generated using green [[energy]] (by [[electrolysis]]). | |||
====Vehicles==== | |||
Car engines '''can''' viably be built to burn hydrogen gas instead of [[gasoline]]. However, this isn't as efficient as building an electric car powered by [[hydrogen fuel cells]] (which use chemistry to convert the hydrogen energy back to electricity, which powers electric motors that run the car). | |||
But even hydrogen fuel cells might not be quite efficient enough: | |||
{{dp | |||
|<nowiki>electrolysis.efficiency</nowiki> | |||
|<nowiki>80%</nowiki> | |||
|<nowiki>Energy efficiency of producing hydrogen & oxygen gases from water</nowiki> | |||
|<nowiki>Hydrogen made by the electrolysis of water is now cost-competitive ...</nowiki><br /><nowiki> | |||
www.carboncommentary.com › blog › hydrogen-made-by-the-electrolysis... </nowiki> | |||
}} | |||
{{dp | |||
|<nowiki>hydrogen_fuel_cell.efficiency</nowiki> | |||
|<nowiki>50%</nowiki> | |||
|<nowiki>Electric energy efficiency of an average hydrogen fuel cell</nowiki> | |||
|<nowiki>Hydrogen Fuel Cells Fact Sheet</nowiki><br /><nowiki> | |||
www.californiahydrogen.org › uploads › files › doe_fuelcell_factsheet</nowiki> | |||
}} | |||
{{calc | |||
|<nowiki>electrolysis.efficiency * hydrogen_fuel_cell.efficiency</nowiki> | |||
|<nowiki>%</nowiki> | |||
}} | |||
This is only half the charge-discharge efficiency of lithium-ion batteries. | |||
Hydrogen fuel cells contain rare minerals.{{qn}} | |||
Hydrogen gas requires a [[pressurized fuel tank]], which is significantly heavier than a gasoline tank{{qn}} but probably not as heavy as a lithium-ion battery pack, for the same amount of energy. Safety concerns are similar to other pressurized fuels such as [[natural gas]] or [[propane]]. | |||
====Heating and cooking==== | |||
* Homes could be heated with hydrogen gas instead of natural gas. | |||
* Gas-powered stoves could easily be adapted to burn hydrogen. | |||
===Lithium-ion batteries=== | ===Lithium-ion batteries=== | ||