On July 31st, China University of Science and Technology released the latest results of a single molecule study. Professor Wang Bing and Zhao Biao of the Hefei National Laboratory for Physical Sciences at the Microscale Laboratory have verified through experiments that the microscopic mechanism of photocatalytic reaction on the surface of titanium dioxide has been successfully revealed to further improve the catalytic activity and research of titanium dioxide. Photochemical reactions provide extremely valuable information. The results were published on July 30th in the international authoritative journal Nature Communications.
Titanium dioxide, commonly known as titanium dioxide, is the whitest thing in the world. Titanium dioxide is an important material in the conversion of solar energy, and it exhibits fascinating prospects in photodecomposition of water to hydrogen production and artificial photosynthesis. The exploration of this material system has become a hot topic in the research of international new energy materials. The search for new catalytic materials and efficient energy conversion mechanisms is an important scientific issue explored by material scientists.
Titanium dioxide is mainly anatase and crystallites. Among them, the crystalline rutile-type structure is stable, has few defects, and has low photocatalytic activity, which is the focus of past research. Prof. Wang Bing and others used pulsed laser deposition technology to prepare high quality anatase reconstituted single crystal thin films. Using scanning tunneling microscopy and atomic manipulation methods, the surface structure and active sites were clearly revealed. Combining with theoretical calculations and analysis by Prof. Chao Zhao and so on, a new surface structure model was proposed to clarify the long-standing controversy over the surface defect structure and chemical activity. Studies have shown that the anatase remodeling surface behaves in a completely oxidized form, correcting the previous structural model of partial oxidation of the surface. Due to the partial oxygen deficiency on the surface, the titanium atoms exposed on the surface exhibit higher reactivity. (Gui Yunan)
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