prousanding the clean fual
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I can't understand your question might be due to spelling mistake
I think that's is the answer of question
Hydrogen itself as a fuel does not generate any other gases when we convert hydrogen with oxygen from the air into any energy like heat or electricity and heat through Fuel Cell system. But REMEMBER that the hydrogen does not exist alone around us. It is very energy consuming way for us to get and store it, THE infrastructure which is one time CO2 generating source. Fortunately the hydrogen is all over the world as a mixture like water, H2O. By electrolysis the water is splitted into hydrogen and oxygen at the voltage of 1.23VDC theoretically. The Direct Current (DC) Voltage could be obtained from Solar Panel which generates DCV. Its efficient is relatively low. But the technology will overcome the efficiency sooner or later.
Hydrogen Energy means, I think, Energy Independence. The source is everywhere, water and Sunlight.