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Advanced materials: general preparation of 3D bicontinuous nanoporous 2D metal compounds

Kdsps two-dimensional metal compounds (TMDs) are a kind of layered materials in which one layer of metal atoms is wrapped by two layers of chalcogenides forming a swich like structure. In recent years due to its wide application in electronics sensing catalysis energy conversion it has been widely concerned. It is one of the most active research directions in the field of new materials to construct two-dimensional metal compounds into three-dimensional structures by utilizing the structural advantages of nanopores such as three-dimensional connectivity high curvature of macropores large specific surface area. At present the preparation methods of

are mainly self-assembly hydrothermal chemical vapor deposition. These methods are faced with many difficulties such as small size poor uniformity difficult to control pore size thickness long preparation cycle poor repeatability. Therefore it is very challenging to fabricate nano porous two-dimensional metal compound materials by these methods. Therefore it is still a challenging work to reasonably construct two-dimensional materials with three-dimensional structure while maintaining the unique physical chemical properties of metal compounds.

in view of this Professor Tan Yongwen's team from school of materials science engineering of Hunan University firstly determined the temperature of forming surface alloy by investigating au-m phase diagram then exposed au-m surface alloy to corresponding gas atmosphere to form the surface alloy MXn@NPG In this process the nanoporous gold not only provides the nanoporous template but also can effectively promote the formation of surface alloy as a catalyst. Based on this strategy 19 kinds of binary 5 kinds of ternary nano porous two-dimensional metal compounds with adjustable atomic thickness pore size were synthesized by using the general method of nano porous gold assisted chemical vapor deposition including sulfide selenide telluride nitride carbonide.

benefit from the nano porous bicontinuous structure abundant adsorption sites. The 3D Mosse alloy materials show excellent electrocatalytic performance for nitrogen reduction. At the same time the chemical valence states structural changes of Mo s Se during the preparation process were systematically analyzed by X-ray photoelectron spectroscopy (XPS) synchrotron radiation X-ray. The phase transition mechanism was revealed the source of catalytic active sites was verified. This work opens up a promising way for basic research potential application of various nano porous metal compounds.

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