Sources and Techniques of Hydrogen Energy: A Review
Keywords:
Hydrogen energy, Hydrogen fuel cell, Liquid hydrogen, Renewable energy, Solid hydrogen, Water electrolysisAbstract
Renewable energy, also called green energy, is energy obtained from natural sources that are found everywhere in the world and are inexhaustible, such as the sun and wind. The importance of renewable energies is increasing for several reasons, including obtaining electricity without emitting carbon dioxide gas that causes global warming, protecting soil and water from pollution, the renewable energy industry requires more manpower than its fossil fuel counterpart, and diversifying energy sources and reducing dependence on fossil fuels, which are limited in quantity, depletable, and take a long time to replenish. Hydrogen energy is a renewable and inexhaustible energy source because its fuel is hydrogen gas, the third most abundant element in nature after oxygen and silicon. It is also considered a clean energy source because using green hydrogen does not emit any polluting gases such as carbon dioxide and methane, which contribute to global warming. Hydrogen energy is considered a high-energy source because the combustion of hydrogen generates four times more heat than the combustion of gasoline. Therefore, it provides energy many times greater than that which can be obtained using fossil fuels. This review introduces the sources and the techniques used to extract the hydrogen energy.
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