Water is H20 two hydrogen atoms to one oxygen.
To get the Hydrogen out of water we put a current through two electrodes.
one electrode gives Hydrogen and the other gives Oxygen.
A fuel cell uses this process in reverse, using something called a Proton Exchange Membrane. In this one side of the membrane has Oxygen and the other side has Hydrogen, A chemical reaction takes place and Heat, Water and Electricity are produced.
The Fuel Cells that are being used for development in the loco are passive cells, that is that the Oxygen is obtained from atmosphere, and the Hydrogen comes from metal hydride storage under low pressure.
More details on how a P.E.M. Fuel Cell can be found here: http://en.wikipedia.org/wiki/Proton_exc ... _fuel_cell
Hope that this helps,,
Whenever the topic of future 'green' carbon free energy crops up I suggest that there is only one answer. That is a nuclear hydrogen future. Nuclear energy produces bulk electricity which can then produce the portable hydrogen.
I appreciate there are a number of problems to be solved, but as the Victorians solved the street horse s--t problem by inventing the IC engine I reckon the solutions will come.
For nuclear it is the need for smaller units and commercialising fusion reactors. For hydrogen it is storage. Smaller 'fuel cells' will appear and IC engines are relatively straight forward to convert.
So look out for the hydrogen powered Mamod.
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