MADISON A discovery at the University of Wisconsin-Madison may represent a significant advance in the quest to create a "hydrogen economy" that would use this abundant element to store and transfer energy.
Theoretically, hydrogen is the ultimate non-carbon, non-polluting fuel for storing intermittent energy from the wind or sun. When burned for energy, hydrogen produces water but no carbon dioxide. Practically speaking, producing hydrogen from water, and then storing and using the gas, have proven difficult.
The new study, now published online at the Journal of the American Chemical Society, introduces a new catalyst structure that can facilitate the use of electricity to produce hydrogen gas from water.
Significantly, the catalyst avoids the rare, expensive metal platinum that is normally required for this reaction. (Catalysts speed up chemical reactions without themselves being consumed.)
The material under study, molybdenum disulfide, contains two common elements, notes Mark Lukowski, a Ph.D. student working with associate professor Song Jin in the UW-Madison chemistry department. "Most people have tried to reduce the cost of the catalyst by making small particles that use less platinum, but here we got rid of the platinum altogether and still got reasonably high performance."
The research group has produced milligram quantities of the catalyst, "but in principle you could scale this up," says Lukowski. "Molybdenum disulfide is a commercially available product. To control purity and structure, we go through the trouble of synthesizing it from the bottom up, but you could buy it today."
To make the new material, Lukowski and Jin deposit nanostructures of molybdenum disulfide on a disk of graphite and then apply a lithium treatment to create a different structure with different properties.
Just as carbon can form diamond for jewelry and graphite for writing, molybdenum disulfide can b
|Contact: Song Jin|
University of Wisconsin-Madison