Preparation And Application Of Few-layer H-BN And Its Combination With Nanometal Materials Composite Nanometal

h-BN nanomaterials have been used as a new type of nanomaterials discovered in recent years.They have many excellent physical properties and chemical properties to make them in the field of environmental water pollution,in the field of renewable energy applications,new micro-nano electronic devices have great application potential.At present,the preparation of layered h-BN with high quality and industrial magnification has become a limiting factor in the commercial application of boron nitride.In this paper,low-cost,high-yield h-BN was developed by commercialized h-BN powder as precursors and aqueous sodium hypochlorite aqueous solution.This method can obtain less(2-4 layers)of h-BN,and h-BN lamellar structure damage is small,the product yield as high as 21%.In the presence of h-BN as the carrier and Ag nanoparticles as the catalyst,the first-order reaction rate constant was 7.13×10-3s-1,which is larger than the first-order reaction rate constant of Ag-nanoparticles loaded with h-BN,and the catalyst has good stability and can be recycled.The experimental results show that the stable peeling process can open the way for a series of important applications of h-BN base layer material.In the experiment,freshly prepared tetraammine chloride,hexahydrate and hexahydrate were used as metal precursors to obtain final product by mixing with potassium borohydride under flowing nitrogen gas at 900 ℃ for 2 h.M@h-BN were prepared by calcining the nanocrystalline copper,cobalt,nickel and cobalt-nickel alloy(),realizing few-layer h-BN synchronous synthesis and in situ reduction of metal nanoparticles.The catalytic activity of CoNi@h-BN(Ea)was calculated to be 28 kJ mol-1,which was lower than that of most metal-based catalysts reported in the literature.The improvement in performance is due to the electronic structure of CoNi NPs after encapsulation and the strong interaction between h-BN and the basic sites of borane ammonia.In addition,the soft magnetic properties exhibited by CoNi@h-BN can be easily recycled and maintained at a high catalytic activity or even recycled five times.Co@h-BN,Ni@h-BN,Cu@h-BN compositesexhibit strong thermal stability,magnetic properties and higher thermal conductivity.In particular,the thermal conductivity of Cu@h-BN is 253.7 Wm-1K-1,and its thermal stability can amount to as high as 414℃.The excellent performance of composite samples is a potential solution for thermal management of small or packaged electronic equipment.Combined with the results of DSC-TG analysis and physicochemical characterization,the possible mechanism of M@h-BN was proposed.At the same time,this new synthetic strategy is expected to be used in electrochemical sensors,high thermal conductivity adhesive materials and fuel cell applications.