Verified answer

Because it's not really cheap, most hydrogen comes from fossil fuels, there's no infrastructure (no fueling stations), which would cost billions of dollars to install, because electric cars are more efficient anyway, etc. etc.

See the link below for further details.

I think the folks from India should answer this one for you.

I've read some info about many alternative fuels being developed in India including a project with Tata motors guided or assisted by Solar Ovonics by Dr. Ovshinsky for hydrogen powered cars.

Be wary of the negative claims made about hydrogen. It can be clean, it can be safe, and it can be economical if we design for cleanliness, safety, and economy.

Good question!

Although hydrogen has a high energy to weight ratio, it has a terribly low energy to volume ratio, even when compressed to a liquid it has a much lower energy density than current fuels.

Liquid hydrogen would be dangerous simply because of the high pressures and low temperatures never mind being combustible.

H2 is the second smallest gas molecule (it's diatomic so the single atom Helium molecule is smaller), it's very difficult to keep sealed up. It would leak out of any kind of container you could make, even solid steel or glass containers won't keep Hydrogen from leaking.

Storing Hydrogen chemically as in Hydrides is safe but is even less dense than the gas and adds a lot of weight.

The cheapest source of Hydrogen is to partially burn coal or natural gas in a process called gasification. Kinda defeats the purpose of a green fuel as gasification releases a lot of CO2.

Atmospheric Hydrogen literally floats away into space. This is how Mars lost most of it's water. Unless you happen to live on a gas giant like Jupiter or Saturn, there just isn't any Hydrogen in the atmosphere and it has to be extracted chemically, via gasification or electrolysis.

Hydrogen just isn't a good fuel period. It's only considered for fuel cells because using hydrocarbons in fuel cells would require an acidic electrolyte which complicates a fuel cell tremendously.

Wood, or even Aluminum would be a better fuel than Hydrogen.

Bc theres no safe to store H in its gas form. It is the smallest atom in the periodic table, there are no welds for metal tanks that can hold H. Picture a net with the holes the size of a baseball. A water molecule (a basketball) cant pass through it, an air molecule (a softball) cant pass through it either but H is the size of a golf ball. This is what its is like on a molecular level. H would leak out of the tanks. It would have to be a plastic or rubber bladder that can withstand an accident.

India is still a developing country n it cannot afford to spend a large amt of money on this technology as this country has to tackle many other problems besides investing in this. For example Poverty, Unemployment, illiteracy, etc ..........India is facing many problems which needs to b put in place 1st rather than going 4 some better things

Because gasoline would have to be at $10 or more a gallon with surplus nuclear power available to make it practical. Hydrogen is one of the most expensive potential alternative fuels to produce or distribute.

commercial production of hydrogen is done by exposing water to extreme heat, which breaks the bond keeping the hydrogen and oxygen together. If you do not have a source of geothermal energy, which the Indians do not, it is very expensive to run this process.

there's no use worrying about safety.. if you're willing to sit in a car,on a two wheeler or a bus carrying enough petrol or diesel or gas to blow you to bits then you can surely deal with hydrogen in your vehicle...

now look it is very dangerous . when hydrogen reacts with oxygen the reaction is explosive and this is why now weather balloons are filled with helium ,the second lightest das, and not with hydrogen

there is not one single drop of H2 on the face of the earth. All the H2 is man made at great expense.