A new dimension to improve the catalytic properties of noble metals airgel electricity
Dresden University of Technology chemist who studied chemistry by re-ligand, creating a surface cleaning of precious metal airgel, thereby improving the electro-catalytic properties. They reported their results in Angewandte Chemie International Edition. Precious airgel (NMA,) is a new class of porous materials, comprising nanoscale, highly active noble metal and a porous structure, exhibits unprecedented performance in various electro-catalytic process. However, various impurities, especially organic ligand, involved in the synthesis and often remain in the respective product, thus impeding the study of the catalytic performance intrinsic electrical NMAs. On the other hand, the presence of the organic ligand is generally considered to be detrimental to the catalytic process, because they can block the active site. However, the lack of methods to impart a controlled manner in a clean ligand of NMA, NMA and therefore has not been validated in the system. Ran Du from China is a researcher Alexander von Humboldt, and since 2017 has served as a postdoctoral professor of physical chemistry group AlexanderEychmüller Dresden University of Technology. He and Duisburg – Essen University Professor Stephan Barcikowski recently created noble metal nanoparticle surface cleaning airgel produced by using a laser, thus revealing a new dimension, may be enhanced by adjusting the ethanol electrooxidation chemical ligand electrocatalytic activity (anode reaction direct ethanol fuel cell). However, Ran and his team ablated various inorganic salts stabilized metal nanoparticles prepared by a laser, which is free of an organic ligand precursor. In this way, they created a gold (Au), palladium (Pd) and gold – no impurities NMA palladium (Au-Pd) of. This achievement highlights the inherent electro-catalytic properties of NMA. Further, the cleaning gel is used intentionally internet graft particular ligand, thereby clearly demonstrated ligand directed electrocatalytic performance tuning. The underlying mechanism is attributed to the electron density adjusting different ligands, wherein the oxidation state of electrocatalytic activity Ethanol oxidation reaction (EOR) positively correlated with the metal. In this regard, polyvinyl pyrrolidone (PVP) Au-Pd-modified airgel bimetal having significant current density, 5.3 times higher than the commercially available Pd / C (palladium / carbon), Au-Pd ratio of raw gas condensate glue 1.7 times. \”Through this work, we not only provide a systemNMA equipment free of impurities to probe their intrinsic properties of the policy, but also by re-examine the role of ligands provides a new direction for the design of high performance electro-catalyst, \”Ran Du said.