Chemical Reactions on Nanoparticle Surface are More Complex than Thought
Written by AZoNanoMay 24 2021
A majority of commercially available chemicals are created with the help of catalysts. Generally, such catalysts contain very small metal nanoparticles that are positioned on an oxidic support.
(a) Modern catalysts consist of nanoparticles. (b) A Rhodium tip as a model for a nanoparticle. (c) Tracing a chemical reaction in real time with a field emission microscope. (d) At low temperatures, different facets oscillate in sync. (e) At higher temperatures, synchronicity is broken. Image Credit: Vienna University of Technology.
A catalytic nanoparticle is analogous to a cut diamond, the surface of which contains varied facets that are oriented in various directions. Besides this, the nanoparticle has crystallographically different facets and such facets can have varied chemical characteristics.
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IMAGE: (a) Modern cataylsts constist of nanoparticles; (b) A Rhodium tip as a model for a nanoparticle; (c) Tracing a chemical reaction in real time with a field emission microscope (d). view more
Credit: TU Wien
Most of commercial chemicals are produced using catalysts. Usually, these catalysts consist of tiny metal nanoparticles that are placed on an oxidic support. Similar to a cut diamond, whose surface consists of different facets oriented in different directions, a catalytic nanoparticle also possesses crystallographically different facets - and these facets can have different chemical properties.
Until now, these differences have often remained unconsidered in catalysis research because it is very difficult to simultaneously obtain information about the chemical reaction itself and about the surface structure of the catalyst. At TU Wien (Vienna), this has now been achieved by combining different microscopic methods: with the help of field electron micro
Scientists at Skoltech Center for Energy Science and Technology have developed an enriched and scalable approach for increasing the capacity of a broad range of metal-ion battery cathode materials. An important advantage of the approach is its scalability. The process requires no sophisticated conditions and is relatively safe. Additionally, the reducing agents can be recycled after they react with the cathodes because their redox chemistry is reversible. These features make the method promising for large-scale applications.
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RIES: Contributing to advancement of life and energy sciences through an interdisciplinary approach
Seventy-eight years have passed since the establishment of the Research Institute of Ultrashort Waves in 1943. The seed planted on that day has grown into what is currently known as the Research Institute for Electronic Science (RIES) of Hokkaido University. The institute has blossomed and produced achievements in the creation of knowledge.
The mid-term evaluation conducted by Japan’s Ministry of Education, Culture, Sports, Science, and Technology (MEXT) granted RIES the highest grade on a five-point grading scale. In this accomplishment, three key members of RIES joined in the following discussion, reminiscing the institute’s progress, past achievements, and attention shift towards interdisciplinary and sharing their hopes.