Question

why scientists preferred hydrogen gas as a fuel now these days

Answer 1

1) It can be easily stored

2) It does not cause air pollution

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Answer 2

Hydrogen gas is generally used in making fuel cells.
⚬Fuel cells have a higher efficiency than diesel or gas engines.
⚬Most fuel cells operate silently, compared to internal combustion engines. They are therefore ideally suited for use within buildings such as hospitals.
⚬Fuel cells can eliminate pollution caused by burning fossil fuels; for hydrogen fuelled fuel cells, the only by-product at point of use is water.If the hydrogen comes from the electrolysis of water driven by renewable energy, then using fuel cells eliminates greenhouse gases over the whole cycle.
⚬Fuel cells do not need conventional fuels such as oil or gas and can therefore reduce economic dependence on oil producing countries, creating greater energy security for the user nation.