Hydrogen fuel
Nanotechnology is enabling the use of hydrogen energy at a much higher capacity. Hydrogen fuel cells, while they are not an energy source themselves, allow for storing energy from sunlight and other renewable sources in an environmentally-friendly fashion without any CO2 emissions.  Some of the main drawbacks of traditional hydrogen fuel cells are that they are expensive and not durable enough for commercial uses. However, by using nanoparticles, both the durability and price over time improve significantly.Furthermore, conventional fuel cells are too large to be stored in volume, but researchers have discovered that nanoblades can store greater volumes of hydrogen that can then be saved inside carbon nanotubes for long-term storage.