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Layered graphene sheets could solve hydrogen storage issues
Date:3/17/2010

rption. In most storage materials, the lower the temperature, the more hydrogen uptake normally occurs. However, the team discovered that GOFs behave quite differently. Although a GOF can absorb hydrogen, it does not take in significant amounts at below 50 Kelvin (-223 degrees Celsius). Moreover, it does not release any hydrogen below this "blocking temperature"suggesting that, with further research, GOFs might be used both to store hydrogen and to release it when it is needed, a fundamental requirement in fuel cell applications.

Some of the GOFs' capabilities are due to the linking molecules themselves. The molecules the team used are all benzene-boronic acids that interact strongly with hydrogen in their own right. But by keeping several angstroms of space between the graphene layersakin to the way pillars hold up a ceilingthey also increase the available surface area of each layer, giving it more spots for the hydrogen to latch on.

According to the team, GOFs will likely perform even better once the team explores their parameters in more detail. "We are going to try to optimize the performance of the GOFs and explore other linking molecules as well," says Jacob Burress, also of NIST. "We want to explore the unusual temperature dependence of absorption kinetics, as well as whether they might be useful for capturing greenhouse gases such as carbon dioxide and toxins like ammonia."


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Contact: Chad Boutin
boutin@nist.gov
301-975-4261
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

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