Two publications suggest a means of containing hydrogen in a pressure vessel that is conformable, lighter and safer than a simple pressure vessel. The potential methods of storing in a vehicle are numerous and none have surfaced that are ideal. This is a rather novel one, but does not strike me as the ultimate answer. The real answer, in my opinion, if hydrogen is needed at all for cars, is to use it in fuel a cell as a replacement for the ICE in a plug-in vehicle.
Examination of Poylymeric Foam as an On-Board Vehicular HPR Hydrogen Storage Media
Hydrostatic pressure retainment (HPR) is an innovative theory for gaseous pressure vessels. An ideal HPR pressure vessel contains an array of spherical cells arranged in a homogeneous fashion that may be likened to a simple-cubic (SC), bodycentered cubic (BCC), or face-centered cubic packing structure (FCC)
The main advantages of HPR pressure vessels over traditional pressure vessels are threefold. First, because an HPR pressure vessel essentially is a matrix of multiple spherical pressure vessels, the outer shell need not be spherical or cylindrical. Rather, the outer shell may take on a conformable geometry, making it more convenient to have a larger tank volume within an automotive assembly. ....
Hydrogen Storage for Automotive Tanks Using Using Hydrostatic Pressure Retainment (HPR) Microstructure
Gas is stored in small bubbles of a foam matrix, thereby forming a series of small spherical pressure vessels. The resulting stress in the material between the bubbles is in a hydrostatic state of tri-axial tension. ....
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