There are two proposed solutions to the issue of hydrogen being less dense, both involving ways of condensing the hydrogen as well as creating conducive storage instruments. Hydrogen can be compressed into tanks designed for containing extremely high pressure. This would be difficult and costly due to how much larger the tank would have to be and the risks involved in pressurizing the hydrogen itself. A tank with that kind of pressure is a volatile risk which could be a possible disaster in a hold. Carbon annotates is one of the more popular ideas connected with the storage debate. The tubes are microscopic tubes of carbon that contain the substance in pores on and within the tube. They can store an immense content of hydrogen, even being quoted at holding up to 65% their body weight in hydrogen.
This estimate is at odds with what the U.S. Department of Energy has defined as safe use for transportation, which is 6.5% it's body weight. This is the minimum containment percentage quoted by researchers, and the only one that government officials have stated is acceptable. Without much more research the usability of this technology is less than optimistic. In the same vain as the nanotubes are glass microspheres, which are glass spheres that are warmed and filled with pressurized hydrogen. Then the glass is cooled which secures the fuel in the globe. When it is reheated by the control device the hydrogen is released for use by the cell. This is much safer than many of the other mentioned storage devices because the pressure is much lower than the rest and the sealability reduces the risk for contamination from outside elements.
There are proposed storage plans from all angles, from those mentioned to that of freezing methods and varieties of compressors. Either way the technologies needed to make any of these workable in a consumer market are years away from being finished at even the most liberal estimates. To make this a viable solution there needs to be more money and time dedicated to research and development.