The use of solar photocatalysis technology to convert solar energy into chemical energy provides a promising method for solving the global energy shortage and environmental pollution problems. Loaded precious metal nanoparticles are a commonly used photocatalyst. However, due to their high surface energy, metal nanoparticles are prone to agglomeration and deactivation during preparation and catalytic applications. How to improve the role of precious metal nanoparticles and carriers to achieve precious metal Efficient use is still the bottleneck restricting its rapid development.
With the support of the National Natural Science Foundation of China (21603228, 21673241, and 21471151) and the Chinese Academy of Sciences' Strategic Leading Science and Technology Project (XDB20000000), the research team of Wang Ruihu, a researcher of the State Key Laboratory of Structural Chemistry at the Fujian Institute of Material Structure, Chinese Academy of Sciences, selected ionic polymers The titanium dioxide nanosheet composite material uses ruthenium ions to be evenly distributed in the ionic polymer through ion exchange technology, thereby effectively inhibiting the agglomeration of ruthenium nanoparticles during the high-temperature roasting process, and obtaining small-sized, highly dispersed ultrafine metal nanoparticles in situ. At the same time, the generated nitrogen-doped carbon not only improves the conductivity of the catalyst, reduces the Schottky energy barrier, promotes the transfer of photogenerated electrons from the excited ruthenium nanoparticles to the surface of titanium dioxide, but also enhances the adsorption of reactive substrate molecules and ruthenium The activity of the nanoparticles increases the activity of the photocatalytic alcohol oxidation reaction in the aqueous medium by more than 4 times. The catalytic material has excellent stability, and the size, distribution and crystal plane of the nanoparticles have not changed significantly after repeated use. This research effectively solves the problem of agglomeration and dispersion of metal nanoparticles during high temperature calcination, and provides a new way for the synthesis of carbon-loaded ultrafine nanoparticles.
The first author of the paper is Assistant Researcher Zhong Hong, and related research results have been published in Energy Environ. Sci. 2019, 12, 418-426.
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