Storing hydrogen makes more sense when it is produced using renewable energy sources (e.g. solar and wind), the availability of which varies over time, and which are not easy to store by other means.
There are several ways of storing hydrogen:
- Hydrogen storage as high-pressure gas, in which it is stored in pressure-resistant cylindrical tanks. This type of tank is used in HRS hydrogen stations and in vehicles.
- Hydrogen storage by cooling to a very low temperature below -253°C to convert it to a liquid. In its liquid state, the hydrogen is stored in vacuum-insulated tanks.
- Solid hydrogen storage: some porous materials such as activated carbon and metal hydrates can absorb hydrogen into their surface. This enables hydrogen to be stored in a reversible way and at lower pressure. Absorption hydrogen storage is a developing technology that shows promising potential.