Professor Mu Shichun’s team made important achievements in the field of Electronic Regulation Mechanism at the Heterointerface
Update Time:2022-07-29 21:25:00

Recently, Professor Mu Shichun’s team from the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology), jointly cooperated with Xianhu laboratory, Foshan City, Guangdong Province, and made great progress in the study of the induction mechanism of built-in electric field (BEF) at the heterointerface. The research paper has been published online in Angelwandte Chemie, the international top journal of chemistry.

At present, platinum (Pt) group metals, especially Pt, as catalysts, play a vital role in the hydrogen evolution reaction (HER) and the whole field of energy conversion electrocatalysis. However, it is too expensive and scarce to be industrialized and popularized. Thus, researchers focused on the development of alternative catalysts. Unfortunately,. But little effect has been achievedup to now, especially in acidic media. Osmium (Os) is the cheapest among the six members of platinum group metals (Pt, Ir, Rh, Pd, Ru, Os), but due to the strong adsorption of Os, it is not conducive to electrocatalytic reactions such as hydrogen evolution. Therefore, it is necessary to modulate the electronic structure of Os to optimize hydrogen adsorption and make its hydrogen evolution reaction activity reach or exceed the level of Pt.

Recently, they discovered the active origin of heterostructure electrocatalysts of HER activity, constructed the Os-OsSe₂ heterostructure electrocatalyst with adjustable phase ratio for the first time by a molten salt method, and determined the structure-activity relationship of the electrocatalyst in combination with the electrochemical performance test.

This work deeply analyzes the internal driving mechanism of electron transfer and charge balance effect caused by heterointerfaces, and puts forward the electronic structure optimization strategy of electrocatalysts, which further enriches the research system of platinum group metal catalysts. In the future, Os, as the cheapest member of the Pt family, will undoubtedly attract much attention. The research results have important implications for electrocatalysis mechanism and the design and construction of other catalytic materials. This research was supported by the National Natural Science Foundation of China (No. 22075223, No. 22179104) and other projects.

Link to the paper: Work-function-induced Interfacial Built-in Electric Fields in Os-OsSe₂ Heterostructures for Active Acidic and Alkaline Hydrogen Evolution

Written by: Huang Linglin

Reviewed by: Luo Xiaohan

Rewritten by: Li Huihui

Edited by:Li Tiantian

Source:State Key Laboratory of Advanced Technology for Materials Synthesis and Processing