Production Of Hydrogen Gas Using molybdenum disulfide Catalyst | Using Hydrogen Gas as Fuel For Future | Hydrogen gas Extraction from water using Inexpensive Method |

New promising catalyst to cut the cost of making hydrogen fuel

7:26 AM, 6th July 2013
Easy Hydrogen Production Process
Song Jin, Associate Professor, UW-Madison.

WISCONSIN, US: Researchers at University of Wisconsin-Madison have made a discovery that 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 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.
According to Mark Lukowski, PhD student, UW-Madison, the material under study, molybdenum disulfide, contains two common elements. “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,” said Song Jin, Associate Professor, UW-Madison.

“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,” said Lukowski.

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 be a semiconductor or a metallic phase, depending on structure. When the compound is grown on the graphite, it is a semiconductor, but it becomes metallic after the lithium treatment. Lukowski and Jin discovered that the metallic phase has far greater catalytic properties.

“Like graphite, which is made up of a stack of sheets that easily separate, molybdenum disulfide is made up of individual sheets that can come apart, and previous studies have shown that the catalytically active sites are located along the edges of the sheets, the lithium treatment both causes the semiconducting-to-metallic phase change and separates the sheets, creating more edges. We have taken away the limitation from molybdenum disulfide and made the active sites both more pervasive and more reactive,” said Lukowski.

“Even though the efficiency of producing hydrogen has been greatly improved, it is still not as good as what platinum can achieve. The next steps include finding ways to further improve the performance by optimizing all aspects of the process and exploring related compounds. There are many hurdles to achieving a hydrogen economy, but the advantages in efficiency and pollution reduction are so significant that we must push ahead,” added Lukowski.

As technological advances put further strain on the supply of platinum and other rare elements, using common elements is a major advantage. The elements we use are cheap and abundant in earth’s crust, and the raw material is already commercially available at low cost. Building on this discovery and new understanding, we would like to further improve these materials to achieve the efficient production of hydrogen without using precious metals,” said Jin.

 

© University of Wisconsin News

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