Recently, a series of progresses have been made in the synthesis of porphyrin molecular self-assembled nanostructures carried out by Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences and Henan University, and the synthesis of hollow platinum metal nanostructures using the porphyrin nanostructures The related achievements are expected to be applied to the research and development of fuel cells in the future.
Porphyrin and its derived compounds are widely present in important organelles related to energy transfer in organisms, such as heme in animals and chlorophyll in plants, which is the key to the respiration of oxygen carried by blood cells and the photosynthesis of plant cells. ingredient. Porphyrin is considered to have great application prospects in energy capture and transfer, chemical catalysis. Because the porphyrin molecule has a conjugated macrocyclic structure and a central coordination metal ion, it is easy to form a nanostructure through the self-assembly of pp stacking and coordination bonds.
Researcher Sun Zaicheng from the State Key Laboratory of Luminescence and Application, Changchun Institute of Optics, Chinese Academy of Sciences and Professor Bai Feng from the Special Functional Materials Laboratory of the Ministry of Education of Henan University studied the self-assembly of porphyrin molecules with the assistance of surfactants. Studies have shown that porphyrin molecules can self-assemble into nanoparticles ranging from nanowires, nanorods to octahedrons. The researchers realized the control of the size and morphology of the nanostructure by changing the reaction conditions, so that the nanostructure has very good single crystallinity and high specific surface area. This porous and single crystal porphyrin nanostructure has potential applications in sensors, nanoelectronics, and optics.
In addition, the researchers used the porphyrin nanostructure as a template to reduce the shell of platinum nanoparticles on the surface of the nanostructure under the catalytic action of visible light and porphyrin molecules. After dissolving out the porphyrin molecules, a hollow platinum nanostructure with a regular structure was obtained , Where the platinum layer is a network structure composed of 3 nanometer platinum nanoparticles. Nanostructured metal platinum is a very important fuel cell catalyst. Researchers found that this hollow platinum nanostructure is the same as the currently commercialized fuel cell catalyst after studying the application of the hollow platinum nanostructure in the catalytic oxidation of methanol. Compared with the performance has been significantly improved, the future is expected to be important applications in the development of fuel cells and electric vehicles.
Related work has published 2 papers in the international journal Nano Letter.
Porphyrin nanorods of different lengths
Electron micrograph of porphyrin nanowire template (A), hollow hexagonal platinum nanotube electron micrograph (B and C) and its high-resolution platinum nanoparticle projection electron micrograph (D)
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