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Novel nano-structures to realize hydrogen's energy potential
Date:8/15/2012

For the first time, engineers at the University of New South Wales have demonstrated that hydrogen can be released and reabsorbed from a promising storage material, overcoming a major hurdle to its use as an alternative fuel source.

Researchers from the Materials Energy Research Laboratory in nanoscale (MERLin) at UNSW have synthesised nanoparticles of a commonly overlooked chemical compound called sodium borohydride (NaBH4) and encased these inside nickel shells. Their unique nanostructure has demonstrated remarkable hydrogen storage properties.

"No one has ever tried to synthesise these particles at the nanoscale because they thought it was too difficult, and couldn't be done. We're the first to do so, and demonstrate that energy in the form of hydrogen can be stored with sodium borohydride at practical temperatures and pressures," says Dr Kondo-Francois Aguey-Zinsou from the School of Chemical Engineering at UNSW.

Considered a major a fuel of the future, able to bridge the gap between renewables and fossil fuels, hydrogen could be used to power buildings, portable electronics and vehicles but this application hinges on practical storage technology.

Lightweight compounds known as borohydrides (including lithium and sodium compounds) are known to be effective storage materials but it was believed that once the energy was released it could not be reabsorbed a critical limitation. This perceived "irreversibility" means there has been little focus on sodium borohydride.

However, the UNSW result published in the journal ACS Nano, demonstrates for the first time that reversibility is indeed possible using a borohydride material by itself and could herald significant advances in the design of novel hydrogen storage materials.

"By controlling the size and architecture of these structures we can tune their properties and make them rever
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Contact: Myles Gough
myles.gough@unsw.edu.au
61-029-385-1933
University of New South Wales
Source:Eurekalert

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