Transition metal carbide/metal organic framework compound and super-assembly preparation method thereof

Abstract

The invention provides a transition metal carbide / metal organic framework compound and a super-assembly preparation method thereof, and relates to the field of metal organic framework materials. According to the transition metal carbide / metal organic framework compound provided by the invention, a nitrogen-carbon framework is wrapped by transition metal carbide in a super-assembly manner, the super-assembly preparation method comprises the following steps: firstly, synthesizing a metal organic framework ZIF-67 with a uniform size through a solution method, then mixing and grinding the metal organic framework ZIF-67 with tungsten trioxide WO3 powder, so that the surface of the ZIF-67 is coated with WO3, and finally, treating the mixture in an inert atmosphere, so that WO3 reacts with carbonin a ZIF-67 skeleton in the process to generate ditungsten carbide in situ, and the ditungsten carbide is super-assembled outside a nitrogen-carbon frame to obtain the material. The preparation method disclosed by the invention is simple and low in price, and the obtained material not only strengthens the protection of metal particles in the nitrogen-carbon framework and improves the stability ofthe material, but also enhances the conductivity of the material.

Description

technical field [0001] The invention relates to the field of metal organic framework materials, in particular to a transition metal carbide / metal organic framework composite and a superassembly preparation method thereof. Background technique [0002] With the global fossil energy running out, clean energy, especially emerging hydrogen energy, is getting more and more attention. The derived electrocatalytic water splitting technology is considered as a potential method for hydrogen production. Water splitting is divided into two half-reactions: hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), and promoting the reaction requires highly active and stable electrocatalysts. The hierarchical porous structure is beneficial to expose the active centers and enhance the mass transfer of electrolyte and substrate to the inner layer of the catalyst. Therefore, porous materials are expected to be dominant materials. [0003] Among porous materials, metal-organic ...

AI Technical Summary

Problems solved by technology

However, simple porous nitrogen-carbon materials have poor conductivity and fewer active sites. The internal metal particles are easily corroded by the electrolyte during the electrocatalytic reaction, resulting in poor overall stability of the catalyst, and it is difficult to replace noble metal catalysts.

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