Hi Alka Patawari, Hydrogen can be a possible replacement for conventional gasoline and diesel fuel. But you know that each and every fuel has it's own advantages and disadvantages. read more
Now, coming to your question, hydrogen is actually used for combustion in rockets and space shuttles were it is stored cryogenically. Even with so much difficulties, hydrogen is preferred because of it's very high energy density and tendency to produce less emissions. read more