The second way of using hydrogen to
power a vehicle is through a fuel cell conversion, where hydrogen is reacted
with oxygen to produce electricity, which is then used to power an electric
motor. Currently these fuel cells are very costly to produce and are not yet
robust enough to take the bumps and vibrations of constant motor vehicle use.
Also most of the working designs currently require very rare materials to work
as catalysts, such as platinum, and so cannot be produced in any commercial
capacity.
Using hydrogen as fuel can be theoretically utilised for any kind of combustible
engine, including motorbikes, boats and air planes. Companies such as Boeing are
currently working on developing a plane that will run on a hydrogen fuel cell
system, although with current technology it is likely that these will be hybrid
planes, and will still relay mainly on conventional fuel systems, with hydrogen
cells as supplementary and back up devices.
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