Hydrogen storage in carbon nanohorns

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Christophe
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Hydrogen storage in carbon nanohorns




by Christophe » 06/06/07, 13:43

Clean energies: carbon nanocornets to store hydrogen

Hydrogen would be the ideal candidate to replace fossil fuels, if it were not so difficult to store in good conditions of safety. CNRS researchers offer a storage solution that is both efficient and inexpensive: carbon nanocornets. With these structures, the hydrogen-carbon bond is much more stable than with nanotubes. This study raises the reservations that prevented considering the use of carbon-based nanomaterials for industrial applications.

Hydrogen, the most abundant element in the Universe, is a renewable energy source alternative to fossil fuels. It is not polluting: the only by-product formed during its production is water. However, the difficulty of storing it in a manner that is both safe and economical has so far made its use marginal.

Among the existing storage methods, assembly with metals seems too expensive. Trapping in porous materials, on the other hand, is both efficient (all the adsorbed hydrogen is recoverable) and inexpensive. In addition, the hydrogen loading and release cycles do not require any reactivation or regeneration of the material. Carbon-based nanostructures (nanotubes or nanocornets), because of their low mass and high adsorption capacity, prove to be excellent contenders for porous materials. However, carbon nanotubes have a major drawback: their storage is only possible at extremely low temperatures (below -196oC), due to the weak interaction between hydrogen and carbon, which limits applications commercial. The future possibility of storing hydrogen inside porous carbon-based materials, as part of a clean energy project, therefore depends closely on the strength of the interaction between hydrogen and carbon. , and the ability to increase this force.


Read more: http://www2.cnrs.fr/presse/communique/1116.htm

seen on Econologique.info
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by Capt_Maloche » 20/02/08, 16:56

Eh yes, apparently it's the nanotubes that the industry is currently focusing on

see http://agora.qc.ca/mot.nsf/Dossiers/Hydrogene in the hydrogen storage chapter
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by Remundo » 20/02/08, 17:34

I don't really understand why we care so much about wanting to store hydrogen, which is the most difficult and dangerous gas to store in the whole perioic classification.

With in addition deplorable yields !!

I think we should move towards in situ production in the car from water (and not reforming natural gas ...).

In particular, we could produce "renewable" sodium by electrolysis (solar or hydraulic / wind energy) of a brine (cooking salt : Cheesy: ). Everyone realizes the potential colossal because of the salt, there is full ocean and we recover it either by evaporation, or not desalination of sea water ...

In the toto, simply mix the sodium which is a light metal with the water in a reactor. It is exothermic and it initially produces H2 under pressure. You can relax the mixture in a first room. Then in a second room, we recompress it and we balance the air, classic combustion ... Rejection: water vapor and soda. Your fill: sodium block (oily on the surface to avoid contact with water) and tap water.

The soda can be recovered in the reactor and / or in the exhaust by condensation. It can then be recycled in the chemical sector which uses it abundantly (in particular the soap industry).

All this combined with PRBC concepts (see the links of my signature) and a good dose of electrical hybridization and the “zero pollution” car may not be an eternal utopia : Idea:

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by Remundo » 20/02/08, 18:06

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by Remundo » 20/02/08, 18:09

You will notice that the small piece of sodium must be 3 cm long by 1 cm wide, visible thickness, 5 mm ...

Especially since he probably didn't have time to react 100% to the explosion ...

Not bad huh ? 8)
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