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Research: Water, Si speed up hydrogen yield

Posted: 25 Jan 2013 ?? ?Print Version ?Bookmark and Share

Keywords:hydrogen? nanosized silicon? fuel cell? military operation?

According to University at Buffalo researchers, super-small particles of silicon react with water to produce hydrogen almost instantaneously. The scientists created spherical silicon particles about 10nm in diameter. When combined with water, the particles reacted to form silicic acid (a nontoxic byproduct) and hydrogena potential source of energy for fuel cells, the team stated.

The reaction didn't require any light, heat or electricity, and also created hydrogen about 150 times faster than similar reactions using silicon particles 100nm wide, and 1,000 times faster than bulk silicon. The scientists were able to verify that the hydrogen they made was relatively pure by testing it successfully in a small fuel cell that powered a fan.

"When it comes to splitting water to produce hydrogen, nanosized silicon may be better than more obvious choices that people have studied for a while, such as aluminium," said researcher Mark T. Swihart, UB professor of chemical and biological engineering.

"With further development, this technology could form the basis of a 'just add water' approach to generating hydrogen on demand," said researcher Paras Prasad, executive director of UB's Institute for Lasers, Photonics and Biophotonics. "The most practical application would be for portable energy sources."

Swihart and Prasad led the study, which was completed by UB scientists, some of whom have affiliations with Nanjing University in China or Korea University in South Korea. Folarin Erogbogbo, a research assistant professor in UB's ILPB and a UB PhD graduate, was first author.

The speed at which the 10nm particles reacted with water surprised the researchers. In under a minute, these particles yielded more hydrogen than the 100nm particles yielded in about 45 minutes. The maximum reaction rate for the 10nm particles was about 150 times as fast.

Swihart said the discrepancy is due to geometry. As they react, the larger particles form nonspherical structures whose surfaces react with water less readily and less uniformly than the surfaces of the smaller, spherical particles, he said.

Though it takes significant energy and resources to produce the super-small silicon balls, the particles could help power portable devices in situations where water is available and portability is more important than low cost. Military operations and camping trips are two examples of such scenarios.

"It was previously unknown that we could generate hydrogen this rapidly from silicon, one of Earth's most abundant elements," Erogbogbo said. "Safe storage of hydrogen has been a difficult problem even though hydrogen is an excellent candidate for alternative energy, and one of the practical applications of our work would be supplying hydrogen for fuel cell power. It could be military vehicles or other portable applications that are near water."

"Perhaps instead of taking a gasoline or diesel generator and fuel tanks or large battery packs with me to the campsite (civilian or military) where water is available, I take a hydrogen fuel cell (much smaller and lighter than the generator) and some plastic cartridges of silicon nanopowder mixed with an activator," Swihart said, envisioning future applications. "Then I can power my satellite radio and telephone, GPS, laptop, lighting, etc. If I time things right, I might even be able to use excess heat generated from the reaction to warm up some water and make tea."





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