Monatomic metal-molybdenum sulfide nano-composite as well as preparation method and application thereof

Abstract

The invention belongs to the field of electro-catalysis, and relates to a monatomic metal-molybdenum sulfide nano-composite as well as a preparation method and an application thereof. The preparation method comprises the following specific steps: modifying the surface of a glassy carbon electrode with a molybdenum sulfide suspension, carrying out underpotential deposition in an inert gas saturated copper sulfate precursor solution, and then transferring into an inert gas saturated potassium chloroplatinite solution to carry out chemical replacement, thereby obtaining the monatomic platinum-molybdenum sulfide nanocomposite. In addition, the invention provides other metal monatomic (palladium, lead, tin and bismuth)-molybdenum sulfide nano-composites prepared by adopting the preparation method. In addition, compared with a commercial platinum / carbon catalyst, the monatomic platinum-molybdenum sulfide nano-composite is higher in hydrogen precipitation catalysis reaction activity, and the preparation method disclosed by the invention is normal in temperature and pressure, controllable in operation, simple and easy to implement, and can be widely applied to various heterogeneous catalysis reactions.

Description

technical field [0001] The invention belongs to the field of electrocatalysis, and in particular relates to a single-atom metal-molybdenum sulfide nanocomposite, a preparation method thereof and an application as a hydrogen evolution reaction catalyst. Background technique [0002] Single-atom metal catalysts with unique coordination environment and 100% atom utilization have become the frontier of catalysis research. Thermodynamically, single atoms have high surface energy, which easily leads to atomic aggregation and catalyst instability. Conventional single-atom synthesis methods have problems such as high energy consumption, harsh conditions, cumbersome procedures, uncontrollability, and low loading capacity, which seriously hinder the development of single-atom catalysts. Therefore, how to prepare high-loaded single-atom metal catalysts simply and efficiently at room temperature and pressure is an important challenge at present. [0003] Due to the characteristics of ...

AI Technical Summary

Problems solved by technology

However, no one has successfully utilized the underpotential deposition technique to achieve the preparation of single-atom metal catalysts

The difficulty lies in that the commonly used substrate materials are composed of the same metal atoms, and the work function is uniform, and it is impossible to realize the metal structure with dispersed atoms, which is very difficult to be deposited electrochemically.

[0004] At present, platinum-based metals are still the most efficient hydrogen evolution catalysts, but such catalysts are expensive and scarce in storage, which seriously limits the wide application of commercialization.

Images