Hydrogen storage

Hydrogen has an image problem thanks to regular replays of the Hindenberg disaster. The traditional storage method is to contain it in pressurised tanks (see Freiburg House, Figure 16). Up to 50 litres can be stored at 200 to 250 bar. Larger-scale operations need pressures of 500-600 bar.

It can be liquefied, but this requires cooling to -253°C which is highly energy intensive. In this form it has a high energy to mass ratio -three times better than petrol but it requires heavily insulated tanks.

Bonded hydrogen is one of the more favoured options. Metal hydrides such as FeTi compounds store hydrogen by bonding it chemically to the surface of the material. The metal is charged by injecting hydrogen at high pressure into a container filled with small particles.

The hydrogen bonds with the material producing heat in the process. The hydrogen is released as the heat and pressure dissipate.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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