Scientists new find way to produce hydrogen

January 23rd, 2009 - 4:01 pm ICT by ANI  

Washington, Jan 23 (ANI): Scientists have discovered a way to produce hydrogen by exposing selected clusters of aluminum atoms to water.

Scientists at Penn State University and the Virginia Commonwealth University in the US made the findings.

It was found that the proximity of the clusters exposed sites plays an important role in affecting the clusters reactions with water.

Our previous research suggested that electronic properties govern everything about these aluminum clusters, but this new study shows that it is the arrangement of atoms within the clusters that allows them to split water, said A. Welford Castleman Jr., Eberly Family Distinguished Chair in Science and Evan Pugh Professor in the Penn State Departments of Chemistry and Physics.

Generally, this knowledge might allow us to design new nanoscale catalysts by changing the arrangements of atoms in a cluster. The results could open up a new area of research, not only related to splitting water, but also to breaking the bonds of other molecules, as well, he added.

The team investigated the reactions of water with individual aluminum clusters by combining them under controlled conditions in a custom-designed flow-reactor.

They found that a water molecule will bind between two aluminum sites in a cluster as long as one of the sites behaves like a Lewis acid, a positively charged center that wants to accept an electron, and the other behaves like a Lewis base, a negatively charged center that wants to give away an electron.

The Lewis-acid aluminum binds to the oxygen in the water and the Lewis-base aluminum dissociates a hydrogen atom.

If this process happens a second time with another set of two aluminum sites and a water molecule, then two hydrogen atoms are available, which then can join to become hydrogen gas (H2).

The team found that the aluminum clusters react differently when exposed to water, depending on the sizes of the clusters and their unique geometric structures.

Three of the aluminum clusters produced hydrogen from water at room temperature.

The ability to produce hydrogen at room temperature is significant because it means that we did not use any heat or energy to trigger the reaction, said Virginia Commonwealth University Professor of Physics Shiv Khanna.

According to Khanna, Traditional techniques for splitting water to produce hydrogen generally require a lot of energy at the time the hydrogen is generated.

But our method allows us to produce hydrogen without supplying heat, connecting to a battery, or adding electricity. Once the aluminum clusters are synthesized, they can generate hydrogen on demand without the need to store it, he added. (ANI)

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