Hydrogen has a low volumetric energy density when compared to some other energy storage materials, such as hydrocarbons like gasoline. This means that it takes up a relatively large volume for a given amount of energy stored. However, hydrogen has a high gravimetric energy density, which means that it has a high amount of energy stored per unit of weight.
The low volumetric energy density of hydrogen can be a challenge for its use as an energy storage medium, particularly for portable applications where weight and size are important considerations. However, it can still be an effective energy storage medium in certain situations, such as for stationary energy storage, where weight and size are less of a concern.
One way that the low volumetric energy density of hydrogen can be mitigated is by using high-pressure tanks to store the hydrogen gas at high pressures, which increases the amount of energy that can be stored in a given volume. Another approach is to use hydrogen in a fuel cell, which can convert the chemical energy of hydrogen into electricity with high efficiency. This allows hydrogen to be used as an energy storage medium without the need to store it in a large volume.
Overall, the low volumetric energy density of hydrogen is a consideration when deciding how to use it as an energy storage medium, but it is not necessarily a disqualifying factor. There are ways to work around this limitation and utilize the unique properties of hydrogen to effectively store and use energy.