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Advantages

If it is made by electrolysis of water using electricity from a nonpolluting source like wind or solar power, then no pollutants of any kind are generated by burning it in an internal combustion engine except for trace amounts of nitrogen oxides

No greenhouse gases are generated because there's no carbon in the fuel.

All that comes out the vehicle's exhaust is potable water

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Disadvantages

Hydrogen is currently very expensive because it's difficult to generate, handle, and store, requiring bulky and heavy tanks.

It is not a very good fuel for an internal combustion engine, being prone to pre-ignition.

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How is Hydrogen Made?

Electrolysis uses electrical energy to split water molecules into hydrogen and oxygen.

Synthesis gas production from steam reforming or partial oxidation. The predominant method for producing synthesis gas is steam reforming of natural gas, although other hydrocarbons can be used as feedstocks.

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