Burning hydrogen seems a useful idea to create energy as it does not produce greenhouse gases so does not accelerate climate change.
Hydrogen, however, must be luiqidised or pressurised so it takes up a smaller volume.
Fuels can be compared by energy densities in which case hydrogen releases far more energy than other fuels but because it is a gas its energy density is lower.
This would mean hydrogen-fuelled vehicles would need huge tanks to keep hydrogen as a gas and to keep it cold, so vehicles may use pressurised hydrogen instead. But because the energy density is much less when liquified, hydrogen still is a highly beneficial fuel.
Fuel cells produce electricity by reacting hydrogen with oxygen where water is the only waste product. This reaction has a partially permeable membrane that only lets hydrogen ions through. Fuel cells are very efficient and are used to power vehicles.
Because hydrogen is not truly clean from the way it is made (directly or indirectly using electricity) it still uses a non-renewable source and produces carbon-dioxide emissions.
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