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High-tech sponge could take hydrogen cars further

Posted by keelynet on October 24, 2008

Another new discovery for storing hydrogen.

“Hydrogen is in many ways the perfect fuel – it can be burnt in combustion engines and produces only water as a by-product. But for hydrogen-powered vehicles, the gas tank is a big limiting factor. Weight for weight, hydrogen is three times as energy dense as petrol, but the gas is difficult to store. Even when liquefied it contains just a quarter of the energy as the same volume of petrol, and that involves high pressures, or super cooling. The latest prototype vehicles can travel only up to 450 kilometres (280 miles) or so on a full tank. Materials scientists in Greece say they have designed a material able to meet a challenge set five years ago by the US Department of Energy to create materials capable of holding 6% of their weight in hydrogen. That compares to the 2% figure achieved by metal hydrides, the most advanced current solid storage materials. Researchers at the University of Crete, proved last year that carbon nanoscrolls can hold up to 3.31% of their weight in hydrogen. Now they have designed a similar material that can theoretically hold almost twice as much, beating the DoE target. The team was led by George Froudakis. The new design comprises sheets of graphene – atom-thick carbon sheets – separated by 1.2-nanometre-tall carbon nanotube pillars. Simulations were used to ensure that hydrogen molecules could freely diffuse throughout a chunk of the material, which is “doped” with positively charged lithium ions to strengthen its hold on the gas. Simulations show that the new material adsorbs 6.1% of its weight in hydrogen at room temperature and pressure.” – Source

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