Oct
4
Solar Powered Eco Friendly Quantum Dots Make Hydrogen Fuel
October 4, 2018 | Leave a Comment
University of Zurich researchers have developed a new type of nanoparticle for novel use in artificial photosynthesis by adding zinc sulfide on the surface of indium-based quantum dots. These quantum dots produce clean hydrogen fuel from water and sunlight – a sustainable source of energy. They introduce new eco-friendly and powerful materials to solar photocatalysis.
Quantum dots are true all-rounders. These material structures, which are only a few nanometers in size, display a similar behavior to that of molecules or atoms, and their form, size and number of electrons can be modulated systematically. This means that their electrical and optical characteristics can be customized for a number of target areas, such as new display technologies, biomedical applications as well as photovoltaics and photocatalysis.
Another current line of application-oriented research aims to generate hydrogen fuel directly from water and solar light. Hydrogen, a clean and efficient energy source, can be converted into forms of fuel that are used widely, including methanol and gasoline.
The team’s research paper has been published in Nature Communications.
The most promising types of quantum dots previously used in energy research contain cadmium, which has been banned from many commodities due to its toxicity. The team of Greta Patzke, Professor at the Department of Chemistry of the University of Zurich, and scientists from Southwest Petroleum University in Chengdu and the Chinese Academy of Sciences have now developed a new type of nanomaterials without toxic components for photocatalysis.
The three-nanometer particles consist of a core of indium phosphide with a very thin surrounding layer of zinc sulfide and sulfide ligands.
Patzke explained, “Compared to the quantum dots that contain cadmium, the new composites are not only environmentally friendly, but also highly efficient when it comes to producing hydrogen from light and water.” Sulfide ligands on the quantum dot surface were found to facilitate the crucial steps involved in light-driven chemical reactions, namely the efficient separation of charge carriers and their rapid transfer to the nanoparticle surface.
The newly developed cadmium-free nanomaterials have the potential to serve as a more eco-friendly alternative for a variety of commercial fields.
Patzke added, “The water-soluble and biocompatible indium-based quantum dots can in the future also be tested in terms of biomass conversion to hydrogen. Or they could be developed into low-toxic biosensors or non-linear optical materials, for example.”
Ms Patzke will continue to focus on the development of catalysts for artificial photosynthesis within the University Research Priority Program ‘LightChEC’. This interdisciplinary research program aims to develop new molecules, materials and processes for the direct storage of solar light energy in chemical bonds.
This fresh birthed concept looks quite interesting. But so far we haven’t seen any price quotes for quantum dots. Which does make one wonder. Still as the potential uses add up the engineers will likely start looking at ideas for mass production of quantum dots. They are sure to be in our future someday.
Comments
Feedburner
Reddit
Stumbleupon
