My research group has made new progress in the controlled preparation of high activity and cheap met

Ultrathin 2D metals have ultra-high specific surface area, excellent electron mobility and electrical conductivity, and due to their special surface-unsaturated atoms and unique electronic states, they have an electrocatalytic field. Very high application value. However, metal atoms tend to form three-dimensional close-packed structures, making liquid phase synthesis of ultra-thin nanosheet structures with a large number of unsaturated coordinating atoms a great challenge. The existing synthesis method can only prepare the precious metal nanosheet structure coated with the surfactant, but the cost of the precious metal material is high. At the same time, the coating of the surface active agent covers the catalytic active sites on the surface, thereby limiting the Conductivity and electrocatalytic activity. However, the liquid phase controlled synthesis of transitional non-precious metal nanosheets with only a few atomic layer thickness exposed on the surface has never been reported.

In response, my research group conducted an in-depth study on this scientific issue, discovered the mechanism of topological transformation of the transition metal hydroxide into the elemental metal in situ, and clarified the changes in the crystal structure during the topological transformation, and the first liquid phase synthesis. Single crystal nickel nanosheet arrays with only 10 atomic layer thicknesses. The ultra-thin Ni nanosheet array has an extremely high surface atomic ratio, a stable crystal structure, and an ultra-vapor-free surface, and therefore has hydrazine hydrate oxidation and electrolysis water hydrogen evolution activity beyond the noble metal catalyst, and ultra-high electrochemical stability. This study provides a new way for the controlled preparation of high activity and cheap metal catalysts. The relevant research results are published in the magazine “Angew. Chem. Int. Ed.”.

Original Title: Single-Crystalline Ultrathin Nickel Nanosheets Array from In Situ Topotactic Reduction for Active and Stable Electrocatalysis