Is it true that hydrogen fuel cell produce unlimited electricity?

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myth2bu

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And is the by product heat and water?
Can they eventually replace the combustion engine?
And the simple design, why are they so expensive?
 
Yes, although if the supply of Hydrogen and Oxygen run out, the Fuel Cell will cease to work.

The by-product is heat and water, because Hydrogen+Oxygen=Water, H2O

It may be able to replace the internal combustion engine, provided it gets much more reliable.

They are so expensive because right now they are in the concept stage. Right now, they are somewhat unreliable, and refilling them is a painstakingly long process. Also, replacing all the gas pumps with hydrogen-pumps would cost upwords of $2,000,000,000.
 
the fuel cell basically is a controlled reaction between oxygen and hydrogen. when the hydrogen is depleted, the electricity production is also stopped. lots of people also believe that hydrogen fuel cell is a clean but they are actually mistaken. how was the hydrogen isolated in the first place? it can take massive amounts of energy to get the hydrogen and it might not always be the cleanest of energy sources.
 
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