Research reveals nanotechnology simplifies hydrogen production for clean energy

Nov 21, 2012
Researchers are producing hydrogen from water using light and novel nanomaterials. Pictured from left to right are: Peichuan Shen, PhD student; Shen Zhao, PhD student; and Dr. Alexander Orlov.

(—In the first-ever experiment of its kind, researchers have demonstrated that clean energy hydrogen can be produced from water splitting by using very small metal particles that are exposed to sunlight. In the article, "Outstanding activity of sub-nm Au clusters for photocatalytic hydrogen production," published in the journal Applied Catalysis B: Environmental,  Alexander Orlov, PhD, an Assistant Professor of Materials Science & Engineering at Stony Brook University, and his colleagues from Stony Brook and Brookhaven National Laboratory, found that the use of gold particles smaller than one nanometer resulted in greater hydrogen production than other co-catalysts tested.

"This is the first ever demonstration of the remarkable potential of very small metal nanoparticles [containing fewer than a dozen atoms] for making fuel from water," said Professor Orlov. Using nanotechnology, Professor Orlov's group found that when the size of are reduced to dimensions below one nanometer, there is a tremendous increase in the ability of these particles to facilitate from water using solar light. They observed a "greater than 35 times increase" in hydrogen evolution as compared to ordinary materials.

Research reveals nanotechnology simplifies hydrogen production for clean energy
Experimental and theory predicted optical properties of supported sub-nanometer particles.

In order to explain these fascinating results, Professor Orlov collaborated with Brookhaven National Lab computational scientist Dr. Yan Li, who found some interesting anomalies in electronic properties of these small particles.  Professor Orlov noted that there is still a tremendous amount of work that needs be done to understand this phenomenon. "It is conceivable that we are only at the beginning of an extraordinary journey to utilize such small particles [of less than a dozen atoms in size] for production," he said.

"In order to reduce our dependence on fossil fuels it is vital to explore various sustainable energy options," Professor Orlov said. "One possible strategy is to develop a hydrogen-based energy economy, which can potentially offer numerous environmental and energy efficiency benefits. Hydrogen can conceivably be a promising energy source in the future as it is a very clean fuel, which produces water as a final combustion product. The current challenge is to find new materials, which can help to produce hydrogen from sustainable sources, such as water."

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not rated yet Nov 21, 2012
Using "gold particles" less than 1 nm? A gold atom is 0.4 nm but is extremely electron conductive at the specific wavelength shown in the spectroscopy chart. It appears the greatest challenge is continuity of inserting one gold atom at the exact point on the CdS surface where efficient conduction can occur, but how thin does the CdS surface need to be to cost effectively insert a single atom? If it can only be done a few nanometres at a time it may never have a cost effective consumer application. Maybe try it with silver?
not rated yet Nov 23, 2012
Maybe that was a typo, meaning one micron instead of on nanometer.
Like you said, gold is about 1/2 nm, or 4 angstroms so that is getting a bit small to be even called nanometrics at that point.

Even a gold atom needs to be held in place somehow to do its work and I doubt very much it could do its catalytic work in isolation.
not rated yet Dec 07, 2012
A gold atom is around 3 angstroms in diameter. I have even made gold nanoparticles < 50 nm in my technical college nanoscience program. It is easy to adjust certain parameters to make gold nanoparticles of a desired diameter. A micron is orders of magnitude larger than the sizes of gold nanoparticles used for their unique properties, thus the prefix nano. It is also easy to produce gold nanoparticles in large quantities for industrial purposes. You guys should wait to comment on something until you know what your talking about.

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