A discovery at the University of Wisconsin-Madison may represent a significant advance in the quest to create a hydrogen economy.
The study, 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.
The material, molybdenum disulfide, contains two common elements, noted 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 so far produced milligram quantities of the catalyst. ‘In principle you could scale this up,’ Lukowski said in a statement. ‘Molybdenum disulfide is a commercially available product. To control purity and structure, we go through the trouble of synthesising 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.
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,’ said Lukowski.
‘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.’
The experiment, supported by the US Department of Energy’s Basic Energy Sciences program, is a proof of concept for a new approach for improving these catalysts, said Jin.
‘Even though the efficiency of producing hydrogen has been greatly improved, it is still not as good as what platinum can achieve,’ he said. ‘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.’