Question

why can hydrogen be used as a fuel

Answer 1

Fuel cell vehicles use hydrogen gas to power an electric motor. Unlike conventional vehicles which run on gasoline or diesel, fuel cell cars and trucks combine hydrogen and oxygen to produce electricity, which runs a motor.

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Himanshu1629

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Answer 2

Hydrogen fuel is a zero-emission fuel when burned with oxygen, if one considers water not to be an emission. It often uses electrochemical cells, or combustion in internal engines, to power vehicles and electric devices. It is also used in the propulsion of spacecraft and might potentially be mass-produced and commercialized for passenger vehicles and aircraft.

Hydrogen lies in the first group and first period in the periodic table, i.e. it is the first element on the periodic table, making it the lightest element. Since hydrogen gas is so light, it rises in the atmosphere and is therefore rarely found in its pure form, H2.[1] In a flame of pure hydrogen gas, burning in air, the hydrogen (H2) reacts with oxygen (O2) to form water (H2O) and releases energy.

2H2(g) + O2(g) → 2H2O(g) + energy

If carried out in atmospheric air instead of pure oxygen, as is usually the case, hydrogen combustion may yield small amounts of nitrogen oxides, along with the water vapor.

The energy released enables hydrogen to act as a fuel. In an electrochemical cell, that energy can be used with relatively high efficiency. If it simply is used for heat, the usual thermodynamics limits on the thermal efficiency apply.

Since there is very little free hydrogen gas, hydrogen is in practice only an energy carrier, like electricity, not an energy resource.[2]Hydrogen gas must be produced, and that production always requires more energy than can be retrieved from the gas as a fuel later on.[3] This is a limitation of the physical law of the conservation of energy. Most hydrogen production induces environmental impacts


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