The equation used to find the percent by weight stored in a material is as follows:
The target of research is to use a lightweight material which can store a relatively large amount of hydrogen.
Carbon nanotubes are lightweight nanostructures, for example, and have been demonstrated to store hydrogen.
Tests from storage in carbon nanotubes show varied results between about 1% to 10% by weight, but there is definite advantage and potential in using nanomaterials.
Hydrogen storage via carbon nanotubes will likely not be the ultimate solution as recent tests consistently showed much less than 6% storage.
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